@ignore
-Copyright (C) 2005, 2006, 2007
+Copyright (C) 2005, 2006, 2007, 2008, 2009
Free Software Foundation, Inc.
This is part of the GNU Fortran manual.
For copying conditions, see the file gfortran.texi.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.2 or
any later version published by the Free Software Foundation; with the
-Invariant Sections being ``GNU General Public License'' and ``Funding
-Free Software'', the Front-Cover texts being (a) (see below), and with
-the Back-Cover Texts being (b) (see below). A copy of the license is
-included in the gfdl(7) man page.
+Invariant Sections being ``Funding Free Software'', the Front-Cover
+Texts being (a) (see below), and with the Back-Cover Texts being (b)
+(see below). A copy of the license is included in the gfdl(7) man page.
Some basic guidelines for editing this document:
(1) The intrinsic procedures are to be listed in alphabetical order.
- (2) The generic name is to be use.
+ (2) The generic name is to be used.
(3) The specific names are included in the function index and in a
table at the end of the node (See ABS entry).
(4) Try to maintain the same style for each entry.
@chapter Intrinsic Procedures
@cindex intrinsic procedures
-This portion of the document is incomplete and undergoing massive expansion
-and editing. All contributions and corrections are strongly encouraged.
-
-Implemented intrinsics are fully functional and available to the user to apply.
-Some intrinsics have documentation yet to be completed as indicated by 'documentation pending'.
-
-@comment Missing intrinsics (double check with #19292)
-@comment - MClock
-@comment - Short
-
@menu
* Introduction: Introduction to Intrinsics
* @code{ABORT}: ABORT, Abort the program
* @code{ATAN}: ATAN, Arctangent function
* @code{ATAN2}: ATAN2, Arctangent function
* @code{ATANH}: ATANH, Hyperbolic arctangent function
-* @code{BESJ0}: BESJ0, Bessel function of the first kind of order 0
-* @code{BESJ1}: BESJ1, Bessel function of the first kind of order 1
-* @code{BESJN}: BESJN, Bessel function of the first kind
-* @code{BESY0}: BESY0, Bessel function of the second kind of order 0
-* @code{BESY1}: BESY1, Bessel function of the second kind of order 1
-* @code{BESYN}: BESYN, Bessel function of the second kind
+* @code{BESSEL_J0}: BESSEL_J0, Bessel function of the first kind of order 0
+* @code{BESSEL_J1}: BESSEL_J1, Bessel function of the first kind of order 1
+* @code{BESSEL_JN}: BESSEL_JN, Bessel function of the first kind
+* @code{BESSEL_Y0}: BESSEL_Y0, Bessel function of the second kind of order 0
+* @code{BESSEL_Y1}: BESSEL_Y1, Bessel function of the second kind of order 1
+* @code{BESSEL_YN}: BESSEL_YN, Bessel function of the second kind
* @code{BIT_SIZE}: BIT_SIZE, Bit size inquiry function
* @code{BTEST}: BTEST, Bit test function
+* @code{C_ASSOCIATED}: C_ASSOCIATED, Status of a C pointer
+* @code{C_F_POINTER}: C_F_POINTER, Convert C into Fortran pointer
+* @code{C_F_PROCPOINTER}: C_F_PROCPOINTER, Convert C into Fortran procedure pointer
+* @code{C_FUNLOC}: C_FUNLOC, Obtain the C address of a procedure
+* @code{C_LOC}: C_LOC, Obtain the C address of an object
+* @code{C_SIZEOF}: C_SIZEOF, Size in bytes of an expression
* @code{CEILING}: CEILING, Integer ceiling function
* @code{CHAR}: CHAR, Integer-to-character conversion function
* @code{CHDIR}: CHDIR, Change working directory
* @code{CHMOD}: CHMOD, Change access permissions of files
* @code{CMPLX}: CMPLX, Complex conversion function
* @code{COMMAND_ARGUMENT_COUNT}: COMMAND_ARGUMENT_COUNT, Get number of command line arguments
+* @code{COMPLEX}: COMPLEX, Complex conversion function
* @code{CONJG}: CONJG, Complex conjugate function
* @code{COS}: COS, Cosine function
* @code{COSH}: COSH, Hyperbolic cosine function
* @code{COUNT}: COUNT, Count occurrences of TRUE in an array
* @code{CPU_TIME}: CPU_TIME, CPU time subroutine
-* @code{CSHIFT}: CSHIFT, Circular array shift function
+* @code{CSHIFT}: CSHIFT, Circular shift elements of an array
* @code{CTIME}: CTIME, Subroutine (or function) to convert a time into a string
* @code{DATE_AND_TIME}: DATE_AND_TIME, Date and time subroutine
* @code{DBLE}: DBLE, Double precision conversion function
* @code{DCMPLX}: DCMPLX, Double complex conversion function
* @code{DFLOAT}: DFLOAT, Double precision conversion function
* @code{DIGITS}: DIGITS, Significant digits function
-* @code{DIM}: DIM, Dim function
+* @code{DIM}: DIM, Positive difference
* @code{DOT_PRODUCT}: DOT_PRODUCT, Dot product function
* @code{DPROD}: DPROD, Double product function
* @code{DREAL}: DREAL, Double real part function
* @code{DTIME}: DTIME, Execution time subroutine (or function)
-* @code{EOSHIFT}: EOSHIFT, End-off shift function
+* @code{EOSHIFT}: EOSHIFT, End-off shift elements of an array
* @code{EPSILON}: EPSILON, Epsilon function
* @code{ERF}: ERF, Error function
* @code{ERFC}: ERFC, Complementary error function
+* @code{ERFC_SCALED}: ERFC_SCALED, Exponentially-scaled complementary error function
* @code{ETIME}: ETIME, Execution time subroutine (or function)
* @code{EXIT}: EXIT, Exit the program with status.
* @code{EXP}: EXP, Exponential function
* @code{FSEEK}: FSEEK, Low level file positioning subroutine
* @code{FSTAT}: FSTAT, Get file status
* @code{FTELL}: FTELL, Current stream position
+* @code{GAMMA}: GAMMA, Gamma function
+* @code{GERROR}: GERROR, Get last system error message
* @code{GETARG}: GETARG, Get command line arguments
* @code{GET_COMMAND}: GET_COMMAND, Get the entire command line
* @code{GET_COMMAND_ARGUMENT}: GET_COMMAND_ARGUMENT, Get command line arguments
* @code{GMTIME}: GMTIME, Convert time to GMT info
* @code{HOSTNM}: HOSTNM, Get system host name
* @code{HUGE}: HUGE, Largest number of a kind
+* @code{HYPOT}: HYPOT, Euclidian distance function
* @code{IACHAR}: IACHAR, Code in @acronym{ASCII} collating sequence
* @code{IAND}: IAND, Bitwise logical and
* @code{IARGC}: IARGC, Get the number of command line arguments
* @code{IDATE}: IDATE, Current local time (day/month/year)
* @code{IEOR}: IEOR, Bitwise logical exclusive or
* @code{IERRNO}: IERRNO, Function to get the last system error number
-* @code{INDEX}: INDEX, Position of a substring within a string
+* @code{INDEX}: INDEX intrinsic, Position of a substring within a string
* @code{INT}: INT, Convert to integer type
+* @code{INT2}: INT2, Convert to 16-bit integer type
+* @code{INT8}: INT8, Convert to 64-bit integer type
* @code{IOR}: IOR, Bitwise logical or
* @code{IRAND}: IRAND, Integer pseudo-random number
+* @code{IS_IOSTAT_END}: IS_IOSTAT_END, Test for end-of-file value
+* @code{IS_IOSTAT_EOR}: IS_IOSTAT_EOR, Test for end-of-record value
+* @code{ISATTY}: ISATTY, Whether a unit is a terminal device
* @code{ISHFT}: ISHFT, Shift bits
* @code{ISHFTC}: ISHFTC, Shift bits circularly
+* @code{ISNAN}: ISNAN, Tests for a NaN
* @code{ITIME}: ITIME, Current local time (hour/minutes/seconds)
* @code{KILL}: KILL, Send a signal to a process
* @code{KIND}: KIND, Kind of an entity
* @code{LBOUND}: LBOUND, Lower dimension bounds of an array
+* @code{LEADZ}: LEADZ, Number of leading zero bits of an integer
* @code{LEN}: LEN, Length of a character entity
* @code{LEN_TRIM}: LEN_TRIM, Length of a character entity without trailing blank characters
* @code{LGE}: LGE, Lexical greater than or equal
* @code{LOC}: LOC, Returns the address of a variable
* @code{LOG}: LOG, Logarithm function
* @code{LOG10}: LOG10, Base 10 logarithm function
+* @code{LOG_GAMMA}: LOG_GAMMA, Logarithm of the Gamma function
* @code{LOGICAL}: LOGICAL, Convert to logical type
+* @code{LONG}: LONG, Convert to integer type
* @code{LSHIFT}: LSHIFT, Left shift bits
* @code{LSTAT}: LSTAT, Get file status
* @code{LTIME}: LTIME, Convert time to local time info
* @code{MAXEXPONENT}: MAXEXPONENT, Maximum exponent of a real kind
* @code{MAXLOC}: MAXLOC, Location of the maximum value within an array
* @code{MAXVAL}: MAXVAL, Maximum value of an array
+* @code{MCLOCK}: MCLOCK, Time function
+* @code{MCLOCK8}: MCLOCK8, Time function (64-bit)
* @code{MERGE}: MERGE, Merge arrays
* @code{MIN}: MIN, Minimum value of an argument list
* @code{MINEXPONENT}: MINEXPONENT, Minimum exponent of a real kind
* @code{PACK}: PACK, Pack an array into an array of rank one
* @code{PERROR}: PERROR, Print system error message
* @code{PRECISION}: PRECISION, Decimal precision of a real kind
-* @code{PRESENT}: PRESENT, Determine whether an optional argument is specified
+* @code{PRESENT}: PRESENT, Determine whether an optional dummy argument is specified
* @code{PRODUCT}: PRODUCT, Product of array elements
* @code{RADIX}: RADIX, Base of a data model
* @code{RANDOM_NUMBER}: RANDOM_NUMBER, Pseudo-random number
* @code{RANDOM_SEED}: RANDOM_SEED, Initialize a pseudo-random number sequence
* @code{RAND}: RAND, Real pseudo-random number
-* @code{RANGE}: RANGE, Decimal exponent range of a real kind
+* @code{RANGE}: RANGE, Decimal exponent range
* @code{RAN}: RAN, Real pseudo-random number
* @code{REAL}: REAL, Convert to real type
* @code{RENAME}: RENAME, Rename a file
* @code{SCALE}: SCALE, Scale a real value
* @code{SCAN}: SCAN, Scan a string for the presence of a set of characters
* @code{SECNDS}: SECNDS, Time function
-@comment * @code{SECOND}: SECOND, (?)
-@comment * @code{SECONDS}: SECONDS, (?)
+* @code{SECOND}: SECOND, CPU time function
+* @code{SELECTED_CHAR_KIND}: SELECTED_CHAR_KIND, Choose character kind
* @code{SELECTED_INT_KIND}: SELECTED_INT_KIND, Choose integer kind
* @code{SELECTED_REAL_KIND}: SELECTED_REAL_KIND, Choose real kind
* @code{SET_EXPONENT}: SET_EXPONENT, Set the exponent of the model
* @code{SIN}: SIN, Sine function
* @code{SINH}: SINH, Hyperbolic sine function
* @code{SIZE}: SIZE, Function to determine the size of an array
+* @code{SIZEOF}: SIZEOF, Determine the size in bytes of an expression
+* @code{SLEEP}: SLEEP, Sleep for the specified number of seconds
* @code{SNGL}: SNGL, Convert double precision real to default real
* @code{SPACING}: SPACING, Smallest distance between two numbers of a given type
* @code{SPREAD}: SPREAD, Add a dimension to an array
* @code{TAN}: TAN, Tangent function
* @code{TANH}: TANH, Hyperbolic tangent function
* @code{TIME}: TIME, Time function
+* @code{TIME8}: TIME8, Time function (64-bit)
* @code{TINY}: TINY, Smallest positive number of a real kind
+* @code{TRAILZ}: TRAILZ, Number of trailing zero bits of an integer
* @code{TRANSFER}: TRANSFER, Transfer bit patterns
* @code{TRANSPOSE}: TRANSPOSE, Transpose an array of rank two
-* @code{TRIM}: TRIM, Function to remove trailing blank characters of a string
+* @code{TRIM}: TRIM, Remove trailing blank characters of a string
+* @code{TTYNAM}: TTYNAM, Get the name of a terminal device.
* @code{UBOUND}: UBOUND, Upper dimension bounds of an array
* @code{UMASK}: UMASK, Set the file creation mask
* @code{UNLINK}: UNLINK, Remove a file from the file system
-* @code{UNMASK}: UNMASK, (?)
* @code{UNPACK}: UNPACK, Unpack an array of rank one into an array
* @code{VERIFY}: VERIFY, Scan a string for the absence of a set of characters
* @code{XOR}: XOR, Bitwise logical exclusive or
The intrinsic procedures provided by GNU Fortran include all of the
intrinsic procedures required by the Fortran 95 standard, a set of
-intrinsic procedures for backwards compatibility with G77, and a small
-selection of intrinsic procedures from the Fortran 2003 standard. Any
-conflict between a description here and a description in either the
-Fortran 95 standard or the Fortran 2003 standard is unintentional, and
-the standard(s) should be considered authoritative.
+intrinsic procedures for backwards compatibility with G77, and a
+selection of intrinsic procedures from the Fortran 2003 and Fortran 2008
+standards. Any conflict between a description here and a description in
+either the Fortran 95 standard, the Fortran 2003 standard or the Fortran
+2008 standard is unintentional, and the standard(s) should be considered
+authoritative.
The enumeration of the @code{KIND} type parameter is processor defined in
the Fortran 95 standard. GNU Fortran defines the default integer type and
have been implemented in @command{gfortran} for backwards compatibility
with @command{g77}. It is noted here that these functions and subroutines
cannot be intermixed in a given subprogram. In the descriptions that follow,
-the applicable option(s) is noted.
+the applicable standard for each intrinsic procedure is noted.
+
@node ABORT
-@section @code{ABORT} --- Abort the program
-@cindex @code{ABORT} intrinsic
-@cindex abort
+@section @code{ABORT} --- Abort the program
+@fnindex ABORT
+@cindex program termination, with core dump
+@cindex terminate program, with core dump
+@cindex core, dump
@table @asis
@item @emph{Description}:
@code{ABORT} causes immediate termination of the program. On operating
-systems that support a core dump, @code{ABORT} will produce a core dump,
-which is suitable for debugging purposes.
+systems that support a core dump, @code{ABORT} will produce a core dump even if
+the option @option{-fno-dump-core} is in effect, which is suitable for debugging
+purposes.
+@c TODO: Check if this (with -fno-dump-core) is correct.
@item @emph{Standard}:
GNU extension
@item @emph{Class}:
-non-elemental subroutine
+Subroutine
@item @emph{Syntax}:
@code{CALL ABORT}
@end table
+
@node ABS
-@section @code{ABS} --- Absolute value
-@cindex @code{ABS} intrinsic
-@cindex @code{CABS} intrinsic
-@cindex @code{DABS} intrinsic
-@cindex @code{IABS} intrinsic
-@cindex @code{ZABS} intrinsic
-@cindex @code{CDABS} intrinsic
+@section @code{ABS} --- Absolute value
+@fnindex ABS
+@fnindex CABS
+@fnindex DABS
+@fnindex IABS
+@fnindex ZABS
+@fnindex CDABS
@cindex absolute value
@table @asis
@item @emph{Description}:
-@code{ABS(X)} computes the absolute value of @code{X}.
+@code{ABS(A)} computes the absolute value of @code{A}.
@item @emph{Standard}:
-F77 and later, has overloads that are GNU extensions
+Fortran 77 and later, has overloads that are GNU extensions
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = ABS(X)}
+@code{RESULT = ABS(A)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type of the argument shall be an @code{INTEGER(*)},
-@code{REAL(*)}, or @code{COMPLEX(*)}.
+@multitable @columnfractions .15 .70
+@item @var{A} @tab The type of the argument shall be an @code{INTEGER},
+@code{REAL}, or @code{COMPLEX}.
@end multitable
@item @emph{Return value}:
The return value is of the same type and
-kind as the argument except the return value is @code{REAL(*)} for a
-@code{COMPLEX(*)} argument.
+kind as the argument except the return value is @code{REAL} for a
+@code{COMPLEX} argument.
@item @emph{Example}:
@smallexample
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
-@item @code{CABS(Z)} @tab @code{COMPLEX(4) Z} @tab @code{REAL(4)} @tab F77 and later
-@item @code{DABS(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab F77 and later
-@item @code{IABS(I)} @tab @code{INTEGER(4) I} @tab @code{INTEGER(4)} @tab F77 and later
-@item @code{ZABS(Z)} @tab @code{COMPLEX(8) Z} @tab @code{COMPLEX(8)} @tab GNU extension
-@item @code{CDABS(Z)} @tab @code{COMPLEX(8) Z} @tab @code{COMPLEX(8)} @tab GNU extension
+@item @code{CABS(A)} @tab @code{COMPLEX(4) Z} @tab @code{REAL(4)} @tab Fortran 77 and later
+@item @code{DABS(A)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab Fortran 77 and later
+@item @code{IABS(A)} @tab @code{INTEGER(4) I} @tab @code{INTEGER(4)} @tab Fortran 77 and later
+@item @code{ZABS(A)} @tab @code{COMPLEX(8) Z} @tab @code{COMPLEX(8)} @tab GNU extension
+@item @code{CDABS(A)} @tab @code{COMPLEX(8) Z} @tab @code{COMPLEX(8)} @tab GNU extension
@end multitable
@end table
+
@node ACCESS
@section @code{ACCESS} --- Checks file access modes
-@cindex @code{ACCESS}
-@cindex file system operations
+@fnindex ACCESS
+@cindex file system, access mode
@table @asis
@item @emph{Description}:
Inquiry function
@item @emph{Syntax}:
-@code{I = ACCESS(NAME, MODE)}
+@code{RESULT = ACCESS(NAME, MODE)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{NAME} @tab Scalar @code{CHARACTER} with the file name.
-Tailing blank are ignored unless the character @code{achar(0)} is
-present, then all characters up to and excluding @code{achar(0)} are
+@multitable @columnfractions .15 .70
+@item @var{NAME} @tab Scalar @code{CHARACTER} of default kind with the
+file name. Tailing blank are ignored unless the character @code{achar(0)}
+is present, then all characters up to and excluding @code{achar(0)} are
used as file name.
-@item @var{MODE} @tab Scalar @code{CHARACTER} with the file access mode,
-may be any concatenation of @code{"r"} (readable), @code{"w"} (writable)
-and @code{"x"} (executable), or @code{" "} to check for existence.
+@item @var{MODE} @tab Scalar @code{CHARACTER} of default kind with the
+file access mode, may be any concatenation of @code{"r"} (readable),
+@code{"w"} (writable) and @code{"x"} (executable), or @code{" "} to check
+for existence.
@end multitable
@item @emph{Return value}:
Returns a scalar @code{INTEGER}, which is @code{0} if the file is
-accessable in the given mode; otherwise or if an invalid argument
+accessible in the given mode; otherwise or if an invalid argument
has been given for @code{MODE} the value @code{1} is returned.
@item @emph{Example}:
@end table
+
@node ACHAR
@section @code{ACHAR} --- Character in @acronym{ASCII} collating sequence
-@cindex @code{ACHAR} intrinsic
+@fnindex ACHAR
@cindex @acronym{ASCII} collating sequence
+@cindex collating sequence, @acronym{ASCII}
@table @asis
@item @emph{Description}:
in the @acronym{ASCII} collating sequence.
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later, with @var{KIND} argument Fortran 2003 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{C = ACHAR(I)}
+@code{RESULT = ACHAR(I [, KIND])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{I} @tab The type shall be @code{INTEGER(*)}.
+@multitable @columnfractions .15 .70
+@item @var{I} @tab The type shall be @code{INTEGER}.
+@item @var{KIND} @tab (Optional) An @code{INTEGER} initialization
+expression indicating the kind parameter of the result.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{CHARACTER} with a length of one. The
-kind type parameter is the same as @code{KIND('A')}.
+The return value is of type @code{CHARACTER} with a length of one.
+If the @var{KIND} argument is present, the return value is of the
+specified kind and of the default kind otherwise.
@item @emph{Example}:
@smallexample
c = achar(32)
end program test_achar
@end smallexample
+
+@item @emph{Note}:
+See @ref{ICHAR} for a discussion of converting between numerical values
+and formatted string representations.
+
+@item @emph{See also}:
+@ref{CHAR}, @ref{IACHAR}, @ref{ICHAR}
+
@end table
@node ACOS
@section @code{ACOS} --- Arccosine function
-@cindex @code{ACOS} intrinsic
-@cindex @code{DACOS} intrinsic
-@cindex trigonometric functions (inverse)
+@fnindex ACOS
+@fnindex DACOS
+@cindex trigonometric function, cosine, inverse
+@cindex cosine, inverse
@table @asis
@item @emph{Description}:
@code{ACOS(X)} computes the arccosine of @var{X} (inverse of @code{COS(X)}).
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later, for a complex argument Fortran 2008 or later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = ACOS(X)}
+@code{RESULT = ACOS(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)} with a magnitude that is
-less than one.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall either be @code{REAL} with a magnitude that is
+less than or equal to one - or the type shall be @code{COMPLEX}.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{REAL(*)} and it lies in the
-range @math{ 0 \leq \acos(x) \leq \pi}. The kind type parameter
-is the same as @var{X}.
+The return value is of the same type and kind as @var{X}.
+The real part of the result is in radians and lies in the range
+@math{0 \leq \Re \acos(x) \leq \pi}.
@item @emph{Example}:
@smallexample
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
-@item @code{DACOS(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab F77 and later
+@item @code{DACOS(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab Fortran 77 and later
@end multitable
@item @emph{See also}:
@end table
+
@node ACOSH
@section @code{ACOSH} --- Hyperbolic arccosine function
-@cindex @code{ACOSH} intrinsic
+@fnindex ACOSH
+@fnindex DACOSH
+@cindex area hyperbolic cosine
@cindex hyperbolic arccosine
-@cindex hyperbolic cosine (inverse)
+@cindex hyperbolic function, cosine, inverse
+@cindex cosine, hyperbolic, inverse
@table @asis
@item @emph{Description}:
-@code{ACOSH(X)} computes the area hyperbolic cosine of @var{X} (inverse of @code{COSH(X)}).
+@code{ACOSH(X)} computes the hyperbolic arccosine of @var{X} (inverse of
+@code{COSH(X)}).
@item @emph{Standard}:
-GNU extension
+Fortran 2008 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = ACOSH(X)}
+@code{RESULT = ACOSH(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)} with a magnitude that is
-greater or equal to one.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be @code{REAL} or @code{COMPLEX}.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{REAL(*)} and it lies in the
-range @math{0 \leq \acosh (x) \leq \infty}.
+The return value has the same type and kind as @var{X}. If @var{X} is
+complex, the imaginary part of the result is in radians and lies between
+@math{ 0 \leq \Im \acosh(x) \leq \pi}.
@item @emph{Example}:
@smallexample
END PROGRAM
@end smallexample
+@item @emph{Specific names}:
+@multitable @columnfractions .20 .20 .20 .25
+@item Name @tab Argument @tab Return type @tab Standard
+@item @code{DACOSH(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab GNU extension
+@end multitable
+
@item @emph{See also}:
Inverse function: @ref{COSH}
@end table
@node ADJUSTL
@section @code{ADJUSTL} --- Left adjust a string
-@cindex @code{ADJUSTL} intrinsic
+@fnindex ADJUSTL
+@cindex string, adjust left
@cindex adjust string
@table @asis
@item @emph{Description}:
-@code{ADJUSTL(STR)} will left adjust a string by removing leading spaces.
+@code{ADJUSTL(STRING)} will left adjust a string by removing leading spaces.
Spaces are inserted at the end of the string as needed.
@item @emph{Standard}:
-F95 and later
+Fortran 90 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{STR = ADJUSTL(STR)}
+@code{RESULT = ADJUSTL(STRING)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{STR} @tab The type shall be @code{CHARACTER}.
+@multitable @columnfractions .15 .70
+@item @var{STRING} @tab The type shall be @code{CHARACTER}.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{CHARACTER} where leading spaces
-are removed and the same number of spaces are inserted on the end
-of @var{STR}.
+The return value is of type @code{CHARACTER} and of the same kind as
+@var{STRING} where leading spaces are removed and the same number of
+spaces are inserted on the end of @var{STRING}.
@item @emph{Example}:
@smallexample
print *, str
end program test_adjustl
@end smallexample
+
+@item @emph{See also}:
+@ref{ADJUSTR}, @ref{TRIM}
@end table
@node ADJUSTR
@section @code{ADJUSTR} --- Right adjust a string
-@cindex @code{ADJUSTR} intrinsic
+@fnindex ADJUSTR
+@cindex string, adjust right
@cindex adjust string
@table @asis
@item @emph{Description}:
-@code{ADJUSTR(STR)} will right adjust a string by removing trailing spaces.
+@code{ADJUSTR(STRING)} will right adjust a string by removing trailing spaces.
Spaces are inserted at the start of the string as needed.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{STR = ADJUSTR(STR)}
+@code{RESULT = ADJUSTR(STRING)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
+@multitable @columnfractions .15 .70
@item @var{STR} @tab The type shall be @code{CHARACTER}.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{CHARACTER} where trailing spaces
-are removed and the same number of spaces are inserted at the start
-of @var{STR}.
+The return value is of type @code{CHARACTER} and of the same kind as
+@var{STRING} where trailing spaces are removed and the same number of
+spaces are inserted at the start of @var{STRING}.
@item @emph{Example}:
@smallexample
print *, str
end program test_adjustr
@end smallexample
+
+@item @emph{See also}:
+@ref{ADJUSTL}, @ref{TRIM}
@end table
@node AIMAG
@section @code{AIMAG} --- Imaginary part of complex number
-@cindex @code{AIMAG} intrinsic
-@cindex @code{DIMAG} intrinsic
-@cindex @code{IMAG} intrinsic
-@cindex @code{IMAGPART} intrinsic
-@cindex imaginary part of a complex number
+@fnindex AIMAG
+@fnindex DIMAG
+@fnindex IMAG
+@fnindex IMAGPART
+@cindex complex numbers, imaginary part
@table @asis
@item @emph{Description}:
strongly discouraged.
@item @emph{Standard}:
-F77 and later, has overloads that are GNU extensions
+Fortran 77 and later, has overloads that are GNU extensions
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = AIMAG(Z)}
+@code{RESULT = AIMAG(Z)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{Z} @tab The type of the argument shall be @code{COMPLEX(*)}.
+@multitable @columnfractions .15 .70
+@item @var{Z} @tab The type of the argument shall be @code{COMPLEX}.
@end multitable
@item @emph{Return value}:
-The return value is of type real with the
+The return value is of type @code{REAL} with the
kind type parameter of the argument.
@item @emph{Example}:
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
@item @code{DIMAG(Z)} @tab @code{COMPLEX(8) Z} @tab @code{REAL(8)} @tab GNU extension
-@item @code{IMAG(Z)} @tab @code{COMPLEX(*) Z} @tab @code{REAL(*)} @tab GNU extension
-@item @code{IMAGPART(Z)} @tab @code{COMPLEX(*) Z} @tab @code{REAL(*)} @tab GNU extension
+@item @code{IMAG(Z)} @tab @code{COMPLEX Z} @tab @code{REAL} @tab GNU extension
+@item @code{IMAGPART(Z)} @tab @code{COMPLEX Z} @tab @code{REAL} @tab GNU extension
@end multitable
@end table
@node AINT
@section @code{AINT} --- Truncate to a whole number
-@cindex @code{AINT} intrinsic
-@cindex @code{DINT} intrinsic
-@cindex whole number
+@fnindex AINT
+@fnindex DINT
+@cindex floor
+@cindex rounding, floor
@table @asis
@item @emph{Description}:
-@code{AINT(X [, KIND])} truncates its argument to a whole number.
+@code{AINT(A [, KIND])} truncates its argument to a whole number.
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = AINT(X [, KIND])}
+@code{RESULT = AINT(A [, KIND])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type of the argument shall be @code{REAL(*)}.
-@item @var{KIND} @tab (Optional) @var{KIND} shall be a scalar integer
-initialization expression.
+@multitable @columnfractions .15 .70
+@item @var{A} @tab The type of the argument shall be @code{REAL}.
+@item @var{KIND} @tab (Optional) An @code{INTEGER} initialization
+expression indicating the kind parameter of the result.
@end multitable
@item @emph{Return value}:
-The return value is of type real with the kind type parameter of the
+The return value is of type @code{REAL} with the kind type parameter of the
argument if the optional @var{KIND} is absent; otherwise, the kind
type parameter will be given by @var{KIND}. If the magnitude of
-@var{X} is less than one, then @code{AINT(X)} returns zero. If the
-magnitude is equal to or greater than one, then it returns the largest
+@var{X} is less than one, @code{AINT(X)} returns zero. If the
+magnitude is equal to or greater than one then it returns the largest
whole number that does not exceed its magnitude. The sign is the same
as the sign of @var{X}.
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
-@item @code{DINT(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab F77 and later
+@item @code{DINT(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab Fortran 77 and later
@end multitable
@end table
@node ALARM
@section @code{ALARM} --- Execute a routine after a given delay
-@cindex @code{ALARM} intrinsic
+@fnindex ALARM
+@cindex delayed execution
@table @asis
@item @emph{Description}:
@code{ALARM(SECONDS, HANDLER [, STATUS])} causes external subroutine @var{HANDLER}
-to be executed after a delay of @var{SECONDS} by using @code{alarm(1)} to
+to be executed after a delay of @var{SECONDS} by using @code{alarm(2)} to
set up a signal and @code{signal(2)} to catch it. If @var{STATUS} is
supplied, it will be returned with the number of seconds remaining until
any previously scheduled alarm was due to be delivered, or zero if there
@code{CALL ALARM(SECONDS, HANDLER [, STATUS])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
+@multitable @columnfractions .15 .70
@item @var{SECONDS} @tab The type of the argument shall be a scalar
@code{INTEGER}. It is @code{INTENT(IN)}.
@item @var{HANDLER} @tab Signal handler (@code{INTEGER FUNCTION} or
-@code{SUBROUTINE}) or dummy/global @code{INTEGER} scalar.
-@code{INTEGER}. It is @code{INTENT(IN)}.
+@code{SUBROUTINE}) or dummy/global @code{INTEGER} scalar. The scalar
+values may be either @code{SIG_IGN=1} to ignore the alarm generated
+or @code{SIG_DFL=0} to set the default action. It is @code{INTENT(IN)}.
@item @var{STATUS} @tab (Optional) @var{STATUS} shall be a scalar
-@code{INTEGER} variable. It is @code{INTENT(OUT)}.
+variable of the default @code{INTEGER} kind. It is @code{INTENT(OUT)}.
@end multitable
@item @emph{Example}:
@node ALL
@section @code{ALL} --- All values in @var{MASK} along @var{DIM} are true
-@cindex @code{ALL} intrinsic
-@cindex true values
+@fnindex ALL
+@cindex array, apply condition
+@cindex array, condition testing
@table @asis
@item @emph{Description}:
in the array along dimension @var{DIM}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
-transformational function
+Transformational function
@item @emph{Syntax}:
-@code{L = ALL(MASK [, DIM])}
+@code{RESULT = ALL(MASK [, DIM])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{MASK} @tab The type of the argument shall be @code{LOGICAL(*)} and
+@multitable @columnfractions .15 .70
+@item @var{MASK} @tab The type of the argument shall be @code{LOGICAL} and
it shall not be scalar.
@item @var{DIM} @tab (Optional) @var{DIM} shall be a scalar integer
with a value that lies between one and the rank of @var{MASK}.
@end multitable
@item @emph{Return value}:
-@code{ALL(MASK)} returns a scalar value of type @code{LOGICAL(*)} where
+@code{ALL(MASK)} returns a scalar value of type @code{LOGICAL} where
the kind type parameter is the same as the kind type parameter of
@var{MASK}. If @var{DIM} is present, then @code{ALL(MASK, DIM)} returns
an array with the rank of @var{MASK} minus 1. The shape is determined from
@node ALLOCATED
@section @code{ALLOCATED} --- Status of an allocatable entity
-@cindex @code{ALLOCATED} intrinsic
-@cindex allocation status
+@fnindex ALLOCATED
+@cindex allocation, status
@table @asis
@item @emph{Description}:
-@code{ALLOCATED(X)} checks the status of whether @var{X} is allocated.
+@code{ALLOCATED(ARRAY)} checks the status of whether @var{X} is allocated.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Inquiry function
@item @emph{Syntax}:
-@code{L = ALLOCATED(X)}
+@code{RESULT = ALLOCATED(ARRAY)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The argument shall be an @code{ALLOCATABLE} array.
+@multitable @columnfractions .15 .70
+@item @var{ARRAY} @tab The argument shall be an @code{ALLOCATABLE} array.
@end multitable
@item @emph{Return value}:
The return value is a scalar @code{LOGICAL} with the default logical
-kind type parameter. If @var{X} is allocated, @code{ALLOCATED(X)}
-is @code{.TRUE.}; otherwise, it returns the @code{.TRUE.}
+kind type parameter. If @var{ARRAY} is allocated, @code{ALLOCATED(ARRAY)}
+is @code{.TRUE.}; otherwise, it returns @code{.FALSE.}
@item @emph{Example}:
@smallexample
program test_allocated
integer :: i = 4
real(4), allocatable :: x(:)
- if (allocated(x) .eqv. .false.) allocate(x(i))
+ if (.not. allocated(x)) allocate(x(i))
end program test_allocated
@end smallexample
@end table
+
@node AND
@section @code{AND} --- Bitwise logical AND
-@cindex @code{AND} intrinsic
-@cindex bit operations
+@fnindex AND
+@cindex bitwise logical and
+@cindex logical and, bitwise
@table @asis
@item @emph{Description}:
GNU extension
@item @emph{Class}:
-Non-elemental function
+Function
@item @emph{Syntax}:
-@code{RESULT = AND(X, Y)}
+@code{RESULT = AND(I, J)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be either @code{INTEGER(*)} or @code{LOGICAL}.
-@item @var{Y} @tab The type shall be either @code{INTEGER(*)} or @code{LOGICAL}.
+@multitable @columnfractions .15 .70
+@item @var{I} @tab The type shall be either a scalar @code{INTEGER}
+type or a scalar @code{LOGICAL} type.
+@item @var{J} @tab The type shall be the same as the type of @var{I}.
@end multitable
@item @emph{Return value}:
-The return type is either @code{INTEGER(*)} or @code{LOGICAL} after
-cross-promotion of the arguments.
+The return type is either a scalar @code{INTEGER} or a scalar
+@code{LOGICAL}. If the kind type parameters differ, then the
+smaller kind type is implicitly converted to larger kind, and the
+return has the larger kind.
@item @emph{Example}:
@smallexample
PROGRAM test_and
- LOGICAL :: T = .TRUE., F = ..FALSE.
+ LOGICAL :: T = .TRUE., F = .FALSE.
INTEGER :: a, b
DATA a / Z'F' /, b / Z'3' /
@end smallexample
@item @emph{See also}:
-F95 elemental function: @ref{IAND}
+Fortran 95 elemental function: @ref{IAND}
@end table
@node ANINT
@section @code{ANINT} --- Nearest whole number
-@cindex @code{ANINT} intrinsic
-@cindex @code{DNINT} intrinsic
-@cindex whole number
+@fnindex ANINT
+@fnindex DNINT
+@cindex ceiling
+@cindex rounding, ceiling
@table @asis
@item @emph{Description}:
-@code{ANINT(X [, KIND])} rounds its argument to the nearest whole number.
+@code{ANINT(A [, KIND])} rounds its argument to the nearest whole number.
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = ANINT(X)}
-@code{X = ANINT(X, KIND)}
+@code{RESULT = ANINT(A [, KIND])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type of the argument shall be @code{REAL(*)}.
-@item @var{KIND} @tab (Optional) @var{KIND} shall be a scalar integer
-initialization expression.
+@multitable @columnfractions .15 .70
+@item @var{A} @tab The type of the argument shall be @code{REAL}.
+@item @var{KIND} @tab (Optional) An @code{INTEGER} initialization
+expression indicating the kind parameter of the result.
@end multitable
@item @emph{Return value}:
The return value is of type real with the kind type parameter of the
argument if the optional @var{KIND} is absent; otherwise, the kind
-type parameter will be given by @var{KIND}. If @var{X} is greater than
-zero, then @code{ANINT(X)} returns @code{AINT(X+0.5)}. If @var{X} is
-less than or equal to zero, then it returns @code{AINT(X-0.5)}.
+type parameter will be given by @var{KIND}. If @var{A} is greater than
+zero, @code{ANINT(A)} returns @code{AINT(X+0.5)}. If @var{A} is
+less than or equal to zero then it returns @code{AINT(X-0.5)}.
@item @emph{Example}:
@smallexample
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
-@item @code{DNINT(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab F77 and later
+@item @code{DNINT(A)} @tab @code{REAL(8) A} @tab @code{REAL(8)} @tab Fortran 77 and later
@end multitable
@end table
@node ANY
@section @code{ANY} --- Any value in @var{MASK} along @var{DIM} is true
-@cindex @code{ANY} intrinsic
-@cindex true values
+@fnindex ANY
+@cindex array, apply condition
+@cindex array, condition testing
@table @asis
@item @emph{Description}:
@var{MASK} along dimension @var{DIM} are @code{.TRUE.}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
-transformational function
+Transformational function
@item @emph{Syntax}:
-@code{L = ANY(MASK)}
-@code{L = ANY(MASK, DIM)}
+@code{RESULT = ANY(MASK [, DIM])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{MASK} @tab The type of the argument shall be @code{LOGICAL(*)} and
+@multitable @columnfractions .15 .70
+@item @var{MASK} @tab The type of the argument shall be @code{LOGICAL} and
it shall not be scalar.
@item @var{DIM} @tab (Optional) @var{DIM} shall be a scalar integer
with a value that lies between one and the rank of @var{MASK}.
@end multitable
@item @emph{Return value}:
-@code{ANY(MASK)} returns a scalar value of type @code{LOGICAL(*)} where
+@code{ANY(MASK)} returns a scalar value of type @code{LOGICAL} where
the kind type parameter is the same as the kind type parameter of
@var{MASK}. If @var{DIM} is present, then @code{ANY(MASK, DIM)} returns
an array with the rank of @var{MASK} minus 1. The shape is determined from
@node ASIN
@section @code{ASIN} --- Arcsine function
-@cindex @code{ASIN} intrinsic
-@cindex @code{DASIN} intrinsic
-@cindex trigonometric functions (inverse)
+@fnindex ASIN
+@fnindex DASIN
+@cindex trigonometric function, sine, inverse
+@cindex sine, inverse
@table @asis
@item @emph{Description}:
@code{ASIN(X)} computes the arcsine of its @var{X} (inverse of @code{SIN(X)}).
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later, for a complex argument Fortran 2008 or later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = ASIN(X)}
+@code{RESULT = ASIN(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)}, and a magnitude that is
-less than one.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be either @code{REAL} and a magnitude that is
+less than or equal to one - or be @code{COMPLEX}.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{REAL(*)} and it lies in the
-range @math{-\pi / 2 \leq \asin (x) \leq \pi / 2}. The kind type
-parameter is the same as @var{X}.
+The return value is of the same type and kind as @var{X}.
+The real part of the result is in radians and lies in the range
+@math{-\pi/2 \leq \Re \asin(x) \leq \pi/2}.
@item @emph{Example}:
@smallexample
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
-@item @code{DASIN(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab F77 and later
+@item @code{DASIN(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab Fortran 77 and later
@end multitable
@item @emph{See also}:
@end table
+
@node ASINH
@section @code{ASINH} --- Hyperbolic arcsine function
-@cindex @code{ASINH} intrinsic
+@fnindex ASINH
+@fnindex DASINH
+@cindex area hyperbolic sine
@cindex hyperbolic arcsine
-@cindex hyperbolic sine (inverse)
+@cindex hyperbolic function, sine, inverse
+@cindex sine, hyperbolic, inverse
@table @asis
@item @emph{Description}:
-@code{ASINH(X)} computes the area hyperbolic sine of @var{X} (inverse of @code{SINH(X)}).
+@code{ASINH(X)} computes the hyperbolic arcsine of @var{X} (inverse of @code{SINH(X)}).
@item @emph{Standard}:
-GNU extension
+Fortran 2008 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = ASINH(X)}
+@code{RESULT = ASINH(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)}, with @var{X} a real number.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be @code{REAL} or @code{COMPLEX}.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{REAL(*)} and it lies in the
-range @math{-\infty \leq \asinh (x) \leq \infty}.
+The return value is of the same type and kind as @var{X}. If @var{X} is
+complex, the imaginary part of the result is in radians and lies between
+@math{-\pi/2 \leq \Im \asinh(x) \leq \pi/2}.
@item @emph{Example}:
@smallexample
END PROGRAM
@end smallexample
+@item @emph{Specific names}:
+@multitable @columnfractions .20 .20 .20 .25
+@item Name @tab Argument @tab Return type @tab Standard
+@item @code{DASINH(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab GNU extension.
+@end multitable
+
@item @emph{See also}:
Inverse function: @ref{SINH}
@end table
@node ASSOCIATED
@section @code{ASSOCIATED} --- Status of a pointer or pointer/target pair
-@cindex @code{ASSOCIATED} intrinsic
-@cindex pointer status
+@fnindex ASSOCIATED
+@cindex pointer, status
+@cindex association status
@table @asis
@item @emph{Description}:
-@code{ASSOCIATED(PTR [, TGT])} determines the status of the pointer @var{PTR}
-or if @var{PTR} is associated with the target @var{TGT}.
+@code{ASSOCIATED(POINTER [, TARGET])} determines the status of the pointer
+@var{POINTER} or if @var{POINTER} is associated with the target @var{TARGET}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Inquiry function
@item @emph{Syntax}:
-@code{L = ASSOCIATED(PTR)}
-@code{L = ASSOCIATED(PTR [, TGT])}
+@code{RESULT = ASSOCIATED(POINTER [, TARGET])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{PTR} @tab @var{PTR} shall have the @code{POINTER} attribute and
-it can be of any type.
-@item @var{TGT} @tab (Optional) @var{TGT} shall be a @code{POINTER} or
-a @code{TARGET}. It must have the same type, kind type parameter, and
-array rank as @var{PTR}.
+@multitable @columnfractions .15 .70
+@item @var{POINTER} @tab @var{POINTER} shall have the @code{POINTER} attribute
+and it can be of any type.
+@item @var{TARGET} @tab (Optional) @var{TARGET} shall be a pointer or
+a target. It must have the same type, kind type parameter, and
+array rank as @var{POINTER}.
@end multitable
-The status of neither @var{PTR} nor @var{TGT} can be undefined.
+The association status of neither @var{POINTER} nor @var{TARGET} shall be
+undefined.
@item @emph{Return value}:
-@code{ASSOCIATED(PTR)} returns a scalar value of type @code{LOGICAL(4)}.
+@code{ASSOCIATED(POINTER)} returns a scalar value of type @code{LOGICAL(4)}.
There are several cases:
@table @asis
-@item (A) If the optional @var{TGT} is not present, then @code{ASSOCIATED(PTR)}
-is true if @var{PTR} is associated with a target; otherwise, it returns false.
-@item (B) If @var{TGT} is present and a scalar target, the result is true if
-@var{TGT}
-is not a 0 sized storage sequence and the target associated with @var{PTR}
-occupies the same storage units. If @var{PTR} is disassociated, then the
-result is false.
-@item (C) If @var{TGT} is present and an array target, the result is true if
-@var{TGT} and @var{PTR} have the same shape, are not 0 sized arrays, are
-arrays whose elements are not 0 sized storage sequences, and @var{TGT} and
-@var{PTR} occupy the same storage units in array element order.
-As in case(B), the result is false, if @var{PTR} is disassociated.
-@item (D) If @var{TGT} is present and an scalar pointer, the result is true if
-target associated with @var{PTR} and the target associated with @var{TGT}
-are not 0 sized storage sequences and occupy the same storage units.
-The result is false, if either @var{TGT} or @var{PTR} is disassociated.
-@item (E) If @var{TGT} is present and an array pointer, the result is true if
-target associated with @var{PTR} and the target associated with @var{TGT}
-have the same shape, are not 0 sized arrays, are arrays whose elements are
-not 0 sized storage sequences, and @var{TGT} and @var{PTR} occupy the same
-storage units in array element order.
-The result is false, if either @var{TGT} or @var{PTR} is disassociated.
+@item (A) When the optional @var{TARGET} is not present then
+@code{ASSOCIATED(POINTER)} is true if @var{POINTER} is associated with a target; otherwise, it returns false.
+@item (B) If @var{TARGET} is present and a scalar target, the result is true if
+@var{TARGET} is not a zero-sized storage sequence and the target associated with @var{POINTER} occupies the same storage units. If @var{POINTER} is
+disassociated, the result is false.
+@item (C) If @var{TARGET} is present and an array target, the result is true if
+@var{TARGET} and @var{POINTER} have the same shape, are not zero-sized arrays,
+are arrays whose elements are not zero-sized storage sequences, and
+@var{TARGET} and @var{POINTER} occupy the same storage units in array element
+order.
+As in case(B), the result is false, if @var{POINTER} is disassociated.
+@item (D) If @var{TARGET} is present and an scalar pointer, the result is true
+if @var{TARGET} is associated with @var{POINTER}, the target associated with
+@var{TARGET} are not zero-sized storage sequences and occupy the same storage
+units.
+The result is false, if either @var{TARGET} or @var{POINTER} is disassociated.
+@item (E) If @var{TARGET} is present and an array pointer, the result is true if
+target associated with @var{POINTER} and the target associated with @var{TARGET}
+have the same shape, are not zero-sized arrays, are arrays whose elements are
+not zero-sized storage sequences, and @var{TARGET} and @var{POINTER} occupy
+the same storage units in array element order.
+The result is false, if either @var{TARGET} or @var{POINTER} is disassociated.
@end table
@item @emph{Example}:
@node ATAN
@section @code{ATAN} --- Arctangent function
-@cindex @code{ATAN} intrinsic
-@cindex @code{DATAN} intrinsic
-@cindex trigonometric functions (inverse)
+@fnindex ATAN
+@fnindex DATAN
+@cindex trigonometric function, tangent, inverse
+@cindex tangent, inverse
@table @asis
@item @emph{Description}:
@code{ATAN(X)} computes the arctangent of @var{X}.
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later, for a complex argument and for two arguments
+Fortran 2008 or later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = ATAN(X)}
+@code{RESULT = ATAN(X)}
+@code{RESULT = ATAN(Y, X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)}.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be @code{REAL} or @code{COMPLEX};
+if @var{Y} is present, @var{X} shall be REAL.
+@item @var{Y} shall be of the same type and kind as @var{X}.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{REAL(*)} and it lies in the
-range @math{ - \pi / 2 \leq \atan (x) \leq \pi / 2}.
+The return value is of the same type and kind as @var{X}.
+If @var{Y} is present, the result is identical to @code{ATAN2(Y,X)}.
+Otherwise, it the arcus tangent of @var{X}, where the real part of
+the result is in radians and lies in the range
+@math{-\pi/2 \leq \Re \atan(x) \leq \pi/2}.
@item @emph{Example}:
@smallexample
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
-@item @code{DATAN(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab F77 and later
+@item @code{DATAN(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab Fortran 77 and later
@end multitable
@item @emph{See also}:
@node ATAN2
@section @code{ATAN2} --- Arctangent function
-@cindex @code{ATAN2} intrinsic
-@cindex @code{DATAN2} intrinsic
-@cindex trigonometric functions (inverse)
+@fnindex ATAN2
+@fnindex DATAN2
+@cindex trigonometric function, tangent, inverse
+@cindex tangent, inverse
@table @asis
@item @emph{Description}:
-@code{ATAN2(Y,X)} computes the arctangent of the complex number @math{X + i Y}.
+@code{ATAN2(Y, X)} computes the principal value of the argument
+function of the complex number @math{X + i Y}. This function can
+be used to transform from carthesian into polar coordinates and
+allows to determine the angle in the correct quadrant.
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = ATAN2(Y,X)}
+@code{RESULT = ATAN2(Y, X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{Y} @tab The type shall be @code{REAL(*)}.
+@multitable @columnfractions .15 .70
+@item @var{Y} @tab The type shall be @code{REAL}.
@item @var{X} @tab The type and kind type parameter shall be the same as @var{Y}.
If @var{Y} is zero, then @var{X} must be nonzero.
@end multitable
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
-@item @code{DATAN2(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab F77 and later
+@item @code{DATAN2(X, Y)} @tab @code{REAL(8) X}, @code{REAL(8) Y} @tab @code{REAL(8)} @tab Fortran 77 and later
@end multitable
@end table
@node ATANH
@section @code{ATANH} --- Hyperbolic arctangent function
-@cindex @code{ASINH} intrinsic
+@fnindex ASINH
+@fnindex DASINH
+@cindex area hyperbolic tangent
@cindex hyperbolic arctangent
-@cindex hyperbolic tangent (inverse)
+@cindex hyperbolic function, tangent, inverse
+@cindex tangent, hyperbolic, inverse
@table @asis
@item @emph{Description}:
-@code{ATANH(X)} computes the area hyperbolic sine of @var{X} (inverse of @code{TANH(X)}).
+@code{ATANH(X)} computes the hyperbolic arctangent of @var{X} (inverse
+of @code{TANH(X)}).
@item @emph{Standard}:
-GNU extension
+Fortran 2008 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = ATANH(X)}
+@code{RESULT = ATANH(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)} with a magnitude that is less than or equal to one.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be @code{REAL} or @code{COMPLEX}.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{REAL(*)} and it lies in the
-range @math{-\infty \leq \atanh(x) \leq \infty}.
+The return value has same type and kind as @var{X}. If @var{X} is
+complex, the imaginary part of the result is in radians and lies between
+@math{-\pi/2 \leq \Im \atanh(x) \leq \pi/2}.
@item @emph{Example}:
@smallexample
END PROGRAM
@end smallexample
+@item @emph{Specific names}:
+@multitable @columnfractions .20 .20 .20 .25
+@item Name @tab Argument @tab Return type @tab Standard
+@item @code{DATANH(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab GNU extension
+@end multitable
+
@item @emph{See also}:
Inverse function: @ref{TANH}
@end table
-
-@node BESJ0
-@section @code{BESJ0} --- Bessel function of the first kind of order 0
-@cindex @code{BESJ0} intrinsic
-@cindex @code{DBESJ0} intrinsic
-@cindex Bessel
+@node BESSEL_J0
+@section @code{BESSEL_J0} --- Bessel function of the first kind of order 0
+@fnindex BESSEL_J0
+@fnindex BESJ0
+@fnindex DBESJ0
+@cindex Bessel function, first kind
@table @asis
@item @emph{Description}:
-@code{BESJ0(X)} computes the Bessel function of the first kind of order 0
-of @var{X}.
+@code{BESSEL_J0(X)} computes the Bessel function of the first kind of
+order 0 of @var{X}. This function is available under the name
+@code{BESJ0} as a GNU extension.
@item @emph{Standard}:
-GNU extension
+Fortran 2008 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = BESJ0(X)}
+@code{RESULT = BESSEL_J0(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)}, and it shall be scalar.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be @code{REAL}, and it shall be scalar.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{REAL(*)} and it lies in the
-range @math{ - 0.4027... \leq Bessel (0,x) \leq 1}.
+The return value is of type @code{REAL} and lies in the
+range @math{ - 0.4027... \leq Bessel (0,x) \leq 1}. It has the same
+kind as @var{X}.
@item @emph{Example}:
@smallexample
program test_besj0
real(8) :: x = 0.0_8
- x = besj0(x)
+ x = bessel_j0(x)
end program test_besj0
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
@item @code{DBESJ0(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab GNU extension
@end multitable
-@node BESJ1
-@section @code{BESJ1} --- Bessel function of the first kind of order 1
-@cindex @code{BESJ1} intrinsic
-@cindex @code{DBESJ1} intrinsic
-@cindex Bessel
+@node BESSEL_J1
+@section @code{BESSEL_J1} --- Bessel function of the first kind of order 1
+@fnindex BESSEL_J1
+@fnindex BESJ1
+@fnindex DBESJ1
+@cindex Bessel function, first kind
@table @asis
@item @emph{Description}:
-@code{BESJ1(X)} computes the Bessel function of the first kind of order 1
-of @var{X}.
+@code{BESSEL_J1(X)} computes the Bessel function of the first kind of
+order 1 of @var{X}. This function is available under the name
+@code{BESJ1} as a GNU extension.
@item @emph{Standard}:
-GNU extension
+Fortran 2008
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = BESJ1(X)}
+@code{RESULT = BESSEL_J1(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)}, and it shall be scalar.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be @code{REAL}, and it shall be scalar.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{REAL(*)} and it lies in the
-range @math{ - 0.5818... \leq Bessel (0,x) \leq 0.5818 }.
+The return value is of type @code{REAL} and it lies in the
+range @math{ - 0.5818... \leq Bessel (0,x) \leq 0.5818 }. It has the same
+kind as @var{X}.
@item @emph{Example}:
@smallexample
program test_besj1
real(8) :: x = 1.0_8
- x = besj1(x)
+ x = bessel_j1(x)
end program test_besj1
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
@item @code{DBESJ1(X)}@tab @code{REAL(8) X} @tab @code{REAL(8)} @tab GNU extension
@end multitable
-@node BESJN
-@section @code{BESJN} --- Bessel function of the first kind
-@cindex @code{BESJN} intrinsic
-@cindex @code{DBESJN} intrinsic
-@cindex Bessel
+@node BESSEL_JN
+@section @code{BESSEL_JN} --- Bessel function of the first kind
+@fnindex BESSEL_JN
+@fnindex BESJN
+@fnindex DBESJN
+@cindex Bessel function, first kind
@table @asis
@item @emph{Description}:
-@code{BESJN(N, X)} computes the Bessel function of the first kind of order
-@var{N} of @var{X}.
+@code{BESSEL_JN(N, X)} computes the Bessel function of the first kind of
+order @var{N} of @var{X}. This function is available under the name
+@code{BESJN} as a GNU extension.
+
+If both arguments are arrays, their ranks and shapes shall conform.
@item @emph{Standard}:
-GNU extension
+Fortran 2008 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{Y = BESJN(N, X)}
+@code{RESULT = BESSEL_JN(N, X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{N} @tab The type shall be @code{INTEGER(*)}, and it shall be scalar.
-@item @var{X} @tab The type shall be @code{REAL(*)}, and it shall be scalar.
+@multitable @columnfractions .15 .70
+@item @var{N} @tab Shall be a scalar or an array of type @code{INTEGER}.
+@item @var{X} @tab Shall be a scalar or an array of type @code{REAL}.
@end multitable
@item @emph{Return value}:
-The return value is a scalar of type @code{REAL(*)}.
+The return value is a scalar of type @code{REAL}. It has the same
+kind as @var{X}.
@item @emph{Example}:
@smallexample
program test_besjn
real(8) :: x = 1.0_8
- x = besjn(5,x)
+ x = bessel_jn(5,x)
end program test_besjn
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
-@item Name @tab Argument @tab Return type @tab Standard
-@item @code{DBESJN(X)} @tab @code{INTEGER(*) N} @tab @code{REAL(8)} @tab GNU extension
-@item @tab @code{REAL(8) X} @tab @tab
+@multitable @columnfractions .20 .20 .20 .25
+@item Name @tab Argument @tab Return type @tab Standard
+@item @code{DBESJN(N, X)} @tab @code{INTEGER N} @tab @code{REAL(8)} @tab GNU extension
+@item @tab @code{REAL(8) X} @tab @tab
@end multitable
@end table
-@node BESY0
-@section @code{BESY0} --- Bessel function of the second kind of order 0
-@cindex @code{BESY0} intrinsic
-@cindex @code{DBESY0} intrinsic
-@cindex Bessel
+@node BESSEL_Y0
+@section @code{BESSEL_Y0} --- Bessel function of the second kind of order 0
+@fnindex BESSEL_Y0
+@fnindex BESY0
+@fnindex DBESY0
+@cindex Bessel function, second kind
@table @asis
@item @emph{Description}:
-@code{BESY0(X)} computes the Bessel function of the second kind of order 0
-of @var{X}.
+@code{BESSEL_Y0(X)} computes the Bessel function of the second kind of
+order 0 of @var{X}. This function is available under the name
+@code{BESY0} as a GNU extension.
@item @emph{Standard}:
-GNU extension
+Fortran 2008 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = BESY0(X)}
+@code{RESULT = BESSEL_Y0(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)}, and it shall be scalar.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be @code{REAL}, and it shall be scalar.
@end multitable
@item @emph{Return value}:
-The return value is a scalar of type @code{REAL(*)}.
+The return value is a scalar of type @code{REAL}. It has the same
+kind as @var{X}.
@item @emph{Example}:
@smallexample
program test_besy0
real(8) :: x = 0.0_8
- x = besy0(x)
+ x = bessel_y0(x)
end program test_besy0
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
@item @code{DBESY0(X)}@tab @code{REAL(8) X} @tab @code{REAL(8)} @tab GNU extension
@end multitable
-@node BESY1
-@section @code{BESY1} --- Bessel function of the second kind of order 1
-@cindex @code{BESY1} intrinsic
-@cindex @code{DBESY1} intrinsic
-@cindex Bessel
+@node BESSEL_Y1
+@section @code{BESSEL_Y1} --- Bessel function of the second kind of order 1
+@fnindex BESSEL_Y1
+@fnindex BESY1
+@fnindex DBESY1
+@cindex Bessel function, second kind
@table @asis
@item @emph{Description}:
-@code{BESY1(X)} computes the Bessel function of the second kind of order 1
-of @var{X}.
+@code{BESSEL_Y1(X)} computes the Bessel function of the second kind of
+order 1 of @var{X}. This function is available under the name
+@code{BESY1} as a GNU extension.
@item @emph{Standard}:
-GNU extension
+Fortran 2008 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = BESY1(X)}
+@code{RESULT = BESSEL_Y1(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)}, and it shall be scalar.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be @code{REAL}, and it shall be scalar.
@end multitable
@item @emph{Return value}:
-The return value is a scalar of type @code{REAL(*)}.
+The return value is a scalar of type @code{REAL}. It has the same
+kind as @var{X}.
@item @emph{Example}:
@smallexample
program test_besy1
real(8) :: x = 1.0_8
- x = besy1(x)
+ x = bessel_y1(x)
end program test_besy1
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
@item @code{DBESY1(X)}@tab @code{REAL(8) X} @tab @code{REAL(8)} @tab GNU extension
@end multitable
-@node BESYN
-@section @code{BESYN} --- Bessel function of the second kind
-@cindex @code{BESYN} intrinsic
-@cindex @code{DBESYN} intrinsic
-@cindex Bessel
+@node BESSEL_YN
+@section @code{BESSEL_YN} --- Bessel function of the second kind
+@fnindex BESSEL_YN
+@fnindex BESYN
+@fnindex DBESYN
+@cindex Bessel function, second kind
@table @asis
@item @emph{Description}:
-@code{BESYN(N, X)} computes the Bessel function of the second kind of order
-@var{N} of @var{X}.
+@code{BESSEL_YN(N, X)} computes the Bessel function of the second kind of
+order @var{N} of @var{X}. This function is available under the name
+@code{BESYN} as a GNU extension.
+
+If both arguments are arrays, their ranks and shapes shall conform.
@item @emph{Standard}:
-GNU extension
+Fortran 2008 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{Y = BESYN(N, X)}
+@code{RESULT = BESSEL_YN(N, X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{N} @tab The type shall be @code{INTEGER(*)}, and it shall be scalar.
-@item @var{X} @tab The type shall be @code{REAL(*)}, and it shall be scalar.
+@multitable @columnfractions .15 .70
+@item @var{N} @tab Shall be a scalar or an array of type @code{INTEGER}.
+@item @var{X} @tab Shall be a scalar or an array of type @code{REAL}.
@end multitable
@item @emph{Return value}:
-The return value is a scalar of type @code{REAL(*)}.
+The return value is a scalar of type @code{REAL}. It has the same
+kind as @var{X}.
@item @emph{Example}:
@smallexample
program test_besyn
real(8) :: x = 1.0_8
- x = besyn(5,x)
+ x = bessel_yn(5,x)
end program test_besyn
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
-@item @code{DBESYN(N,X)} @tab @code{INTEGER(*) N} @tab @code{REAL(8)} @tab GNU extension
+@item @code{DBESYN(N,X)} @tab @code{INTEGER N} @tab @code{REAL(8)} @tab GNU extension
@item @tab @code{REAL(8) X} @tab @tab
@end multitable
@end table
@node BIT_SIZE
@section @code{BIT_SIZE} --- Bit size inquiry function
-@cindex @code{BIT_SIZE} intrinsic
-@cindex bit size of a variable
+@fnindex BIT_SIZE
+@cindex bits, number of
@cindex size of a variable, in bits
@table @asis
@item @emph{Description}:
@code{BIT_SIZE(I)} returns the number of bits (integer precision plus sign bit)
-represented by the type of @var{I}.
+represented by the type of @var{I}. The result of @code{BIT_SIZE(I)} is
+independent of the actual value of @var{I}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Inquiry function
@item @emph{Syntax}:
-@code{I = BIT_SIZE(I)}
+@code{RESULT = BIT_SIZE(I)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{I} @tab The type shall be @code{INTEGER(*)}.
+@multitable @columnfractions .15 .70
+@item @var{I} @tab The type shall be @code{INTEGER}.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{INTEGER(*)}
+The return value is of type @code{INTEGER}
@item @emph{Example}:
@smallexample
@node BTEST
@section @code{BTEST} --- Bit test function
-@cindex @code{BTEST} intrinsic
-@cindex bit operations
+@fnindex BTEST
+@cindex bits, testing
@table @asis
@item @emph{Description}:
@code{BTEST(I,POS)} returns logical @code{.TRUE.} if the bit at @var{POS}
-in @var{I} is set.
+in @var{I} is set. The counting of the bits starts at 0.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{I = BTEST(I,POS)}
+@code{RESULT = BTEST(I, POS)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{I} @tab The type shall be @code{INTEGER(*)}.
-@item @var{POS} @tab The type shall be @code{INTEGER(*)}.
+@multitable @columnfractions .15 .70
+@item @var{I} @tab The type shall be @code{INTEGER}.
+@item @var{POS} @tab The type shall be @code{INTEGER}.
@end multitable
@item @emph{Return value}:
@end table
+@node C_ASSOCIATED
+@section @code{C_ASSOCIATED} --- Status of a C pointer
+@fnindex C_ASSOCIATED
+@cindex association status, C pointer
+@cindex pointer, C association status
+
+@table @asis
+@item @emph{Description}:
+@code{C_ASSOCIATED(c_prt_1[, c_ptr_2])} determines the status of the C pointer
+@var{c_ptr_1} or if @var{c_ptr_1} is associated with the target @var{c_ptr_2}.
+
+@item @emph{Standard}:
+Fortran 2003 and later
+
+@item @emph{Class}:
+Inquiry function
+
+@item @emph{Syntax}:
+@code{RESULT = C_ASSOCIATED(c_prt_1[, c_ptr_2])}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{c_ptr_1} @tab Scalar of the type @code{C_PTR} or @code{C_FUNPTR}.
+@item @var{c_ptr_2} @tab (Optional) Scalar of the same type as @var{c_ptr_1}.
+@end multitable
+
+@item @emph{Return value}:
+The return value is of type @code{LOGICAL}; it is @code{.false.} if either
+@var{c_ptr_1} is a C NULL pointer or if @var{c_ptr1} and @var{c_ptr_2}
+point to different addresses.
+
+@item @emph{Example}:
+@smallexample
+subroutine association_test(a,b)
+ use iso_c_binding, only: c_associated, c_loc, c_ptr
+ implicit none
+ real, pointer :: a
+ type(c_ptr) :: b
+ if(c_associated(b, c_loc(a))) &
+ stop 'b and a do not point to same target'
+end subroutine association_test
+@end smallexample
+
+@item @emph{See also}:
+@ref{C_LOC}, @ref{C_FUNLOC}
+@end table
+
+
+@node C_FUNLOC
+@section @code{C_FUNLOC} --- Obtain the C address of a procedure
+@fnindex C_FUNLOC
+@cindex pointer, C address of procedures
+
+@table @asis
+@item @emph{Description}:
+@code{C_FUNLOC(x)} determines the C address of the argument.
+
+@item @emph{Standard}:
+Fortran 2003 and later
+
+@item @emph{Class}:
+Inquiry function
+
+@item @emph{Syntax}:
+@code{RESULT = C_FUNLOC(x)}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{x} @tab Interoperable function or pointer to such function.
+@end multitable
+
+@item @emph{Return value}:
+The return value is of type @code{C_FUNPTR} and contains the C address
+of the argument.
+
+@item @emph{Example}:
+@smallexample
+module x
+ use iso_c_binding
+ implicit none
+contains
+ subroutine sub(a) bind(c)
+ real(c_float) :: a
+ a = sqrt(a)+5.0
+ end subroutine sub
+end module x
+program main
+ use iso_c_binding
+ use x
+ implicit none
+ interface
+ subroutine my_routine(p) bind(c,name='myC_func')
+ import :: c_funptr
+ type(c_funptr), intent(in) :: p
+ end subroutine
+ end interface
+ call my_routine(c_funloc(sub))
+end program main
+@end smallexample
+
+@item @emph{See also}:
+@ref{C_ASSOCIATED}, @ref{C_LOC}, @ref{C_F_POINTER}, @ref{C_F_PROCPOINTER}
+@end table
+
+
+@node C_F_PROCPOINTER
+@section @code{C_F_PROCPOINTER} --- Convert C into Fortran procedure pointer
+@fnindex C_F_PROCPOINTER
+@cindex pointer, C address of pointers
+
+@table @asis
+@item @emph{Description}:
+@code{C_F_PROCPOINTER(CPTR, FPTR)} Assign the target of the C function pointer
+@var{CPTR} to the Fortran procedure pointer @var{FPTR}.
+
+Note: Due to the currently lacking support of procedure pointers in GNU Fortran
+this function is not fully operable.
+
+@item @emph{Standard}:
+Fortran 2003 and later
+
+@item @emph{Class}:
+Subroutine
+
+@item @emph{Syntax}:
+@code{CALL C_F_PROCPOINTER(cptr, fptr)}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{CPTR} @tab scalar of the type @code{C_FUNPTR}. It is
+@code{INTENT(IN)}.
+@item @var{FPTR} @tab procedure pointer interoperable with @var{cptr}. It is
+@code{INTENT(OUT)}.
+@end multitable
+
+@item @emph{Example}:
+@smallexample
+program main
+ use iso_c_binding
+ implicit none
+ abstract interface
+ function func(a)
+ import :: c_float
+ real(c_float), intent(in) :: a
+ real(c_float) :: func
+ end function
+ end interface
+ interface
+ function getIterFunc() bind(c,name="getIterFunc")
+ import :: c_funptr
+ type(c_funptr) :: getIterFunc
+ end function
+ end interface
+ type(c_funptr) :: cfunptr
+ procedure(func), pointer :: myFunc
+ cfunptr = getIterFunc()
+ call c_f_procpointer(cfunptr, myFunc)
+end program main
+@end smallexample
+
+@item @emph{See also}:
+@ref{C_LOC}, @ref{C_F_POINTER}
+@end table
+
+
+@node C_F_POINTER
+@section @code{C_F_POINTER} --- Convert C into Fortran pointer
+@fnindex C_F_POINTER
+@cindex pointer, convert C to Fortran
+
+@table @asis
+@item @emph{Description}:
+@code{C_F_POINTER(CPTR, FPTR[, SHAPE])} Assign the target the C pointer
+@var{CPTR} to the Fortran pointer @var{FPTR} and specify its
+shape.
+
+@item @emph{Standard}:
+Fortran 2003 and later
+
+@item @emph{Class}:
+Subroutine
+
+@item @emph{Syntax}:
+@code{CALL C_F_POINTER(CPTR, FPTR[, SHAPE])}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{CPTR} @tab scalar of the type @code{C_PTR}. It is
+@code{INTENT(IN)}.
+@item @var{FPTR} @tab pointer interoperable with @var{cptr}. It is
+@code{INTENT(OUT)}.
+@item @var{SHAPE} @tab (Optional) Rank-one array of type @code{INTEGER}
+with @code{INTENT(IN)}. It shall be present
+if and only if @var{fptr} is an array. The size
+must be equal to the rank of @var{fptr}.
+@end multitable
+
+@item @emph{Example}:
+@smallexample
+program main
+ use iso_c_binding
+ implicit none
+ interface
+ subroutine my_routine(p) bind(c,name='myC_func')
+ import :: c_ptr
+ type(c_ptr), intent(out) :: p
+ end subroutine
+ end interface
+ type(c_ptr) :: cptr
+ real,pointer :: a(:)
+ call my_routine(cptr)
+ call c_f_pointer(cptr, a, [12])
+end program main
+@end smallexample
+
+@item @emph{See also}:
+@ref{C_LOC}, @ref{C_F_PROCPOINTER}
+@end table
+
+
+@node C_LOC
+@section @code{C_LOC} --- Obtain the C address of an object
+@fnindex C_LOC
+@cindex procedure pointer, convert C to Fortran
+
+@table @asis
+@item @emph{Description}:
+@code{C_LOC(X)} determines the C address of the argument.
+
+@item @emph{Standard}:
+Fortran 2003 and later
+
+@item @emph{Class}:
+Inquiry function
+
+@item @emph{Syntax}:
+@code{RESULT = C_LOC(X)}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{X} @tab Associated scalar pointer or interoperable scalar
+or allocated allocatable variable with @code{TARGET} attribute.
+@end multitable
+
+@item @emph{Return value}:
+The return value is of type @code{C_PTR} and contains the C address
+of the argument.
+
+@item @emph{Example}:
+@smallexample
+subroutine association_test(a,b)
+ use iso_c_binding, only: c_associated, c_loc, c_ptr
+ implicit none
+ real, pointer :: a
+ type(c_ptr) :: b
+ if(c_associated(b, c_loc(a))) &
+ stop 'b and a do not point to same target'
+end subroutine association_test
+@end smallexample
+
+@item @emph{See also}:
+@ref{C_ASSOCIATED}, @ref{C_FUNLOC}, @ref{C_F_POINTER}, @ref{C_F_PROCPOINTER}
+@end table
+
+
+@node C_SIZEOF
+@section @code{C_SIZEOF} --- Size in bytes of an expression
+@fnindex C_SIZEOF
+@cindex expression size
+@cindex size of an expression
+
+@table @asis
+@item @emph{Description}:
+@code{C_SIZEOF(X)} calculates the number of bytes of storage the
+expression @code{X} occupies.
+
+@item @emph{Standard}:
+Fortran 2008
+
+@item @emph{Class}:
+Intrinsic function
+
+@item @emph{Syntax}:
+@code{N = C_SIZEOF(X)}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The argument shall be of any type, rank or shape.
+@end multitable
+
+@item @emph{Return value}:
+The return value is of type integer and of the system-dependent kind
+@var{C_SIZE_T} (from the @var{ISO_C_BINDING} module). Its value is the
+number of bytes occupied by the argument. If the argument has the
+@code{POINTER} attribute, the number of bytes of the storage area pointed
+to is returned. If the argument is of a derived type with @code{POINTER}
+or @code{ALLOCATABLE} components, the return value doesn't account for
+the sizes of the data pointed to by these components.
+
+@item @emph{Example}:
+@smallexample
+ use iso_c_binding
+ integer(c_int) :: i
+ real(c_float) :: r, s(5)
+ print *, (c_sizeof(s)/c_sizeof(r) == 5)
+ end
+@end smallexample
+The example will print @code{.TRUE.} unless you are using a platform
+where default @code{REAL} variables are unusually padded.
+
+@item @emph{See also}:
+@ref{SIZEOF}
+@end table
+
@node CEILING
@section @code{CEILING} --- Integer ceiling function
-@cindex @code{CEILING} intrinsic
+@fnindex CEILING
@cindex ceiling
+@cindex rounding, ceiling
@table @asis
@item @emph{Description}:
-@code{CEILING(X)} returns the least integer greater than or equal to @var{X}.
+@code{CEILING(A)} returns the least integer greater than or equal to @var{A}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{I = CEILING(X[,KIND])}
+@code{RESULT = CEILING(A [, KIND])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)}.
-@item @var{KIND} @tab (Optional) scalar integer initialization expression.
+@multitable @columnfractions .15 .70
+@item @var{A} @tab The type shall be @code{REAL}.
+@item @var{KIND} @tab (Optional) An @code{INTEGER} initialization
+expression indicating the kind parameter of the result.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{INTEGER(KIND)}
+The return value is of type @code{INTEGER(KIND)} if @var{KIND} is present
+and a default-kind @code{INTEGER} otherwise.
@item @emph{Example}:
@smallexample
@node CHAR
@section @code{CHAR} --- Character conversion function
-@cindex @code{CHAR} intrinsic
-@cindex conversion function (character)
+@fnindex CHAR
+@cindex conversion, to character
@table @asis
@item @emph{Description}:
-@code{CHAR(I,[KIND])} returns the character represented by the integer @var{I}.
+@code{CHAR(I [, KIND])} returns the character represented by the integer @var{I}.
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{C = CHAR(I[,KIND])}
+@code{RESULT = CHAR(I [, KIND])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{I} @tab The type shall be @code{INTEGER(*)}.
-@item @var{KIND} @tab Optional scaler integer initialization expression.
+@multitable @columnfractions .15 .70
+@item @var{I} @tab The type shall be @code{INTEGER}.
+@item @var{KIND} @tab (Optional) An @code{INTEGER} initialization
+expression indicating the kind parameter of the result.
@end multitable
@item @emph{Return value}:
end program test_char
@end smallexample
+@item @emph{Note}:
+See @ref{ICHAR} for a discussion of converting between numerical values
+and formatted string representations.
+
@item @emph{See also}:
-@ref{ACHAR}, @ref{ICHAR}, @ref{IACHAR}
+@ref{ACHAR}, @ref{IACHAR}, @ref{ICHAR}
@end table
+
@node CHDIR
@section @code{CHDIR} --- Change working directory
-@cindex @code{CHDIR} intrinsic
-@cindex file system operations
+@fnindex CHDIR
+@cindex system, working directory
@table @asis
@item @emph{Description}:
-Change current working directory to a specified @var{PATH}.
+Change current working directory to a specified path.
+
+This intrinsic is provided in both subroutine and function forms; however,
+only one form can be used in any given program unit.
@item @emph{Standard}:
GNU extension
@item @emph{Class}:
-Non-elemental subroutine
+Subroutine, function
@item @emph{Syntax}:
-@code{CALL chdir(PATH[,STATUS])}
+@multitable @columnfractions .80
+@item @code{CALL CHDIR(NAME [, STATUS])}
+@item @code{STATUS = CHDIR(NAME)}
+@end multitable
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{PATH} @tab The type shall be @code{CHARACTER(*)} and shall specify a valid path within the file system.
-@item @var{STATUS} @tab (Optional) status flag. Returns 0 on success,
- a system specific and non-zero error code otherwise.
+@multitable @columnfractions .15 .70
+@item @var{NAME} @tab The type shall be @code{CHARACTER} of default
+kind and shall specify a valid path within the file system.
+@item @var{STATUS} @tab (Optional) @code{INTEGER} status flag of the default
+kind. Returns 0 on success, and a system specific and nonzero error code
+otherwise.
@end multitable
@item @emph{Example}:
@node CHMOD
@section @code{CHMOD} --- Change access permissions of files
-@cindex @code{CHMOD} intrinsic
-@cindex file system operations
+@fnindex CHMOD
+@cindex file system, change access mode
@table @asis
@item @emph{Description}:
GNU extension
@item @emph{Class}:
-Subroutine, non-elemental function
+Subroutine, function
@item @emph{Syntax}:
@multitable @columnfractions .80
@end multitable
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{NAME} @tab Scalar @code{CHARACTER} with the file name.
-Trailing blanks are ignored unless the character @code{achar(0)} is
-present, then all characters up to and excluding @code{achar(0)} are
-used as the file name.
+@multitable @columnfractions .15 .70
+
+@item @var{NAME} @tab Scalar @code{CHARACTER} of default kind with the
+file name. Trailing blanks are ignored unless the character
+@code{achar(0)} is present, then all characters up to and excluding
+@code{achar(0)} are used as the file name.
-@item @var{MODE} @tab Scalar @code{CHARACTER} giving the file permission.
-@var{MODE} uses the same syntax as the @var{MODE} argument of
-@code{/bin/chmod}.
+@item @var{MODE} @tab Scalar @code{CHARACTER} of default kind giving the
+file permission. @var{MODE} uses the same syntax as the @var{MODE}
+argument of @code{/bin/chmod}.
@item @var{STATUS} @tab (optional) scalar @code{INTEGER}, which is
-@code{0} on success and non-zero otherwise.
+@code{0} on success and nonzero otherwise.
@end multitable
@item @emph{Return value}:
-In either syntax, @var{STATUS} is set to @code{0} on success and non-zero
+In either syntax, @var{STATUS} is set to @code{0} on success and nonzero
otherwise.
@item @emph{Example}:
print *, 'Status: ', status
end program chmod_test
@end smallexample
-@code{CHMOD} as non-elemental function:
+@code{CHMOD} as function:
@smallexample
program chmod_test
implicit none
print *, 'Status: ', status
end program chmod_test
@end smallexample
-@item @emph{Specific names}:
-@item @emph{See also}:
@end table
+
@node CMPLX
@section @code{CMPLX} --- Complex conversion function
-@cindex @code{CMPLX} intrinsic
+@fnindex CMPLX
@cindex complex numbers, conversion to
+@cindex conversion, to complex
@table @asis
@item @emph{Description}:
-@code{CMPLX(X[,Y[,KIND]])} returns a complex number where @var{X} is converted to
+@code{CMPLX(X [, Y [, KIND]])} returns a complex number where @var{X} is converted to
the real component. If @var{Y} is present it is converted to the imaginary
component. If @var{Y} is not present then the imaginary component is set to
0.0. If @var{X} is complex then @var{Y} must not be present.
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{C = CMPLX(X[,Y[,KIND]])}
+@code{RESULT = CMPLX(X [, Y [, KIND]])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type may be @code{INTEGER(*)}, @code{REAL(*)}, or @code{COMPLEX(*)}.
-@item @var{Y} @tab Optional, allowed if @var{X} is not @code{COMPLEX(*)}. May be @code{INTEGER(*)} or @code{REAL(*)}.
-@item @var{KIND} @tab Optional scaler integer initialization expression.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type may be @code{INTEGER}, @code{REAL},
+or @code{COMPLEX}.
+@item @var{Y} @tab (Optional; only allowed if @var{X} is not
+@code{COMPLEX}.) May be @code{INTEGER} or @code{REAL}.
+@item @var{KIND} @tab (Optional) An @code{INTEGER} initialization
+expression indicating the kind parameter of the result.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{COMPLEX(*)}
+The return value is of @code{COMPLEX} type, with a kind equal to
+@var{KIND} if it is specified. If @var{KIND} is not specified, the
+result is of the default @code{COMPLEX} kind, regardless of the kinds of
+@var{X} and @var{Y}.
@item @emph{Example}:
@smallexample
print *, z, cmplx(x)
end program test_cmplx
@end smallexample
+
+@item @emph{See also}:
+@ref{COMPLEX}
@end table
@node COMMAND_ARGUMENT_COUNT
@section @code{COMMAND_ARGUMENT_COUNT} --- Get number of command line arguments
-@cindex @code{COMMAND_ARGUMENT_COUNT} intrinsic
-@cindex command-line arguments, to program
+@fnindex COMMAND_ARGUMENT_COUNT
+@cindex command-line arguments
+@cindex command-line arguments, number of
+@cindex arguments, to program
@table @asis
@item @emph{Description}:
command line when the containing program was invoked.
@item @emph{Standard}:
-F2003
+Fortran 2003 and later
@item @emph{Class}:
Inquiry function
@item @emph{Syntax}:
-@code{I = COMMAND_ARGUMENT_COUNT()}
+@code{RESULT = COMMAND_ARGUMENT_COUNT()}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
+@multitable @columnfractions .15 .70
@item None
@end multitable
@item @emph{Return value}:
-The return value is of type @code{INTEGER(4)}
+The return value is an @code{INTEGER} of default kind.
@item @emph{Example}:
@smallexample
@ref{GET_COMMAND}, @ref{GET_COMMAND_ARGUMENT}
@end table
-@node CONJG
+
+
+@node COMPLEX
+@section @code{COMPLEX} --- Complex conversion function
+@fnindex COMPLEX
+@cindex complex numbers, conversion to
+@cindex conversion, to complex
+
+@table @asis
+@item @emph{Description}:
+@code{COMPLEX(X, Y)} returns a complex number where @var{X} is converted
+to the real component and @var{Y} is converted to the imaginary
+component.
+
+@item @emph{Standard}:
+GNU extension
+
+@item @emph{Class}:
+Elemental function
+
+@item @emph{Syntax}:
+@code{RESULT = COMPLEX(X, Y)}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type may be @code{INTEGER} or @code{REAL}.
+@item @var{Y} @tab The type may be @code{INTEGER} or @code{REAL}.
+@end multitable
+
+@item @emph{Return value}:
+If @var{X} and @var{Y} are both of @code{INTEGER} type, then the return
+value is of default @code{COMPLEX} type.
+
+If @var{X} and @var{Y} are of @code{REAL} type, or one is of @code{REAL}
+type and one is of @code{INTEGER} type, then the return value is of
+@code{COMPLEX} type with a kind equal to that of the @code{REAL}
+argument with the highest precision.
+
+@item @emph{Example}:
+@smallexample
+program test_complex
+ integer :: i = 42
+ real :: x = 3.14
+ print *, complex(i, x)
+end program test_complex
+@end smallexample
+
+@item @emph{See also}:
+@ref{CMPLX}
+@end table
+
+
+
+@node CONJG
@section @code{CONJG} --- Complex conjugate function
-@cindex @code{CONJG} intrinsic
-@cindex @code{DCONJG} intrinsic
+@fnindex CONJG
+@fnindex DCONJG
@cindex complex conjugate
+
@table @asis
@item @emph{Description}:
@code{CONJG(Z)} returns the conjugate of @var{Z}. If @var{Z} is @code{(x, y)}
then the result is @code{(x, -y)}
@item @emph{Standard}:
-F77 and later, has overloads that are GNU extensions
+Fortran 77 and later, has overloads that are GNU extensions
@item @emph{Class}:
Elemental function
@code{Z = CONJG(Z)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{Z} @tab The type shall be @code{COMPLEX(*)}.
+@multitable @columnfractions .15 .70
+@item @var{Z} @tab The type shall be @code{COMPLEX}.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{COMPLEX(*)}.
+The return value is of type @code{COMPLEX}.
@item @emph{Example}:
@smallexample
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
@item @code{DCONJG(Z)} @tab @code{COMPLEX(8) Z} @tab @code{COMPLEX(8)} @tab GNU extension
@end multitable
@node COS
@section @code{COS} --- Cosine function
-@cindex @code{COS} intrinsic
-@cindex @code{DCOS} intrinsic
-@cindex @code{ZCOS} intrinsic
-@cindex @code{CDCOS} intrinsic
-@cindex trigonometric functions
+@fnindex COS
+@fnindex DCOS
+@fnindex CCOS
+@fnindex ZCOS
+@fnindex CDCOS
+@cindex trigonometric function, cosine
+@cindex cosine
@table @asis
@item @emph{Description}:
@code{COS(X)} computes the cosine of @var{X}.
@item @emph{Standard}:
-F77 and later, has overloads that are GNU extensions
+Fortran 77 and later, has overloads that are GNU extensions
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = COS(X)}
+@code{RESULT = COS(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)} or
-@code{COMPLEX(*)}.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be @code{REAL} or
+@code{COMPLEX}.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{REAL(*)} and it lies in the
-range @math{ -1 \leq \cos (x) \leq 1}. The kind type
-parameter is the same as @var{X}.
+The return value is of the same type and kind as @var{X}. The real part
+of the result is in radians. If @var{X} is of the type @code{REAL},
+the return value lies in the range @math{ -1 \leq \cos (x) \leq 1}.
@item @emph{Example}:
@smallexample
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
-@item @code{DCOS(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab F77 and later
-@item @code{CCOS(X)} @tab @code{COMPLEX(4) X} @tab @code{COMPLEX(4)} @tab F77 and later
+@item @code{DCOS(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab Fortran 77 and later
+@item @code{CCOS(X)} @tab @code{COMPLEX(4) X} @tab @code{COMPLEX(4)} @tab Fortran 77 and later
@item @code{ZCOS(X)} @tab @code{COMPLEX(8) X} @tab @code{COMPLEX(8)} @tab GNU extension
@item @code{CDCOS(X)} @tab @code{COMPLEX(8) X} @tab @code{COMPLEX(8)} @tab GNU extension
@end multitable
@node COSH
@section @code{COSH} --- Hyperbolic cosine function
-@cindex @code{COSH} intrinsic
-@cindex @code{DCOSH} intrinsic
+@fnindex COSH
+@fnindex DCOSH
@cindex hyperbolic cosine
+@cindex hyperbolic function, cosine
+@cindex cosine, hyperbolic
@table @asis
@item @emph{Description}:
@code{COSH(X)} computes the hyperbolic cosine of @var{X}.
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later, for a complex argument Fortran 2008 or later
@item @emph{Class}:
Elemental function
@code{X = COSH(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)}.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be @code{REAL} or @code{COMPLEX}.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{REAL(*)} and it is positive
-(@math{ \cosh (x) \geq 0 }.
+The return value has same type and kind as @var{X}. If @var{X} is
+complex, the imaginary part of the result is in radians. If @var{X}
+is @code{REAL}, the return value has a lower bound of one,
+@math{\cosh (x) \geq 1}.
@item @emph{Example}:
@smallexample
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
-@item @code{DCOSH(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab F77 and later
+@item @code{DCOSH(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab Fortran 77 and later
@end multitable
@item @emph{See also}:
@node COUNT
@section @code{COUNT} --- Count function
-@cindex @code{COUNT} intrinsic
-@cindex count
+@fnindex COUNT
+@cindex array, conditionally count elements
+@cindex array, element counting
+@cindex array, number of elements
@table @asis
@item @emph{Description}:
-@code{COUNT(MASK[,DIM])} counts the number of @code{.TRUE.} elements of
-@var{MASK} along the dimension of @var{DIM}. If @var{DIM} is omitted it is
-taken to be @code{1}. @var{DIM} is a scaler of type @code{INTEGER} in the
-range of @math{1 /leq DIM /leq n)} where @math{n} is the rank of @var{MASK}.
+
+@code{COUNT(MASK [, DIM [, KIND]])} counts the number of @code{.TRUE.}
+elements of @var{MASK} along the dimension of @var{DIM}. If @var{DIM} is
+omitted it is taken to be @code{1}. @var{DIM} is a scalar of type
+@code{INTEGER} in the range of @math{1 \leq DIM \leq n)} where @math{n}
+is the rank of @var{MASK}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later, with @var{KIND} argument Fortran 2003 and later
@item @emph{Class}:
-transformational function
+Transformational function
@item @emph{Syntax}:
-@code{I = COUNT(MASK[,DIM])}
+@code{RESULT = COUNT(MASK [, DIM [, KIND]])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
+@multitable @columnfractions .15 .70
@item @var{MASK} @tab The type shall be @code{LOGICAL}.
-@item @var{DIM} @tab The type shall be @code{INTEGER}.
+@item @var{DIM} @tab (Optional) The type shall be @code{INTEGER}.
+@item @var{KIND} @tab (Optional) An @code{INTEGER} initialization
+expression indicating the kind parameter of the result.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{INTEGER} with rank equal to that of
-@var{MASK}.
+The return value is of type @code{INTEGER} and of kind @var{KIND}. If
+@var{KIND} is absent, the return value is of default integer kind.
+The result has a rank equal to that of @var{MASK}.
@item @emph{Example}:
@smallexample
@node CPU_TIME
@section @code{CPU_TIME} --- CPU elapsed time in seconds
-@cindex @code{CPU_TIME} intrinsic
+@fnindex CPU_TIME
@cindex time, elapsed
-@cindex elapsed time
@table @asis
@item @emph{Description}:
-Returns a @code{REAL} value representing the elapsed CPU time in seconds. This
-is useful for testing segments of code to determine execution time.
+Returns a @code{REAL} value representing the elapsed CPU time in
+seconds. This is useful for testing segments of code to determine
+execution time.
+
+If a time source is available, time will be reported with microsecond
+resolution. If no time source is available, @var{TIME} is set to
+@code{-1.0}.
+
+Note that @var{TIME} may contain a, system dependent, arbitrary offset
+and may not start with @code{0.0}. For @code{CPU_TIME}, the absolute
+value is meaningless, only differences between subsequent calls to
+this subroutine, as shown in the example below, should be used.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Subroutine
@item @emph{Syntax}:
-@code{CPU_TIME(X)}
+@code{CALL CPU_TIME(TIME)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL} with @code{INTENT(OUT)}.
+@multitable @columnfractions .15 .70
+@item @var{TIME} @tab The type shall be @code{REAL} with @code{INTENT(OUT)}.
@end multitable
@item @emph{Return value}:
print '("Time = ",f6.3," seconds.")',finish-start
end program test_cpu_time
@end smallexample
+
+@item @emph{See also}:
+@ref{SYSTEM_CLOCK}, @ref{DATE_AND_TIME}
@end table
@node CSHIFT
-@section @code{CSHIFT} --- Circular shift function
-@cindex @code{CSHIFT} intrinsic
-@cindex bit operations
+@section @code{CSHIFT} --- Circular shift elements of an array
+@fnindex CSHIFT
+@cindex array, shift circularly
+@cindex array, permutation
+@cindex array, rotate
@table @asis
@item @emph{Description}:
-@code{CSHIFT(ARRAY, SHIFT[,DIM])} performs a circular shift on elements of
+@code{CSHIFT(ARRAY, SHIFT [, DIM])} performs a circular shift on elements of
@var{ARRAY} along the dimension of @var{DIM}. If @var{DIM} is omitted it is
-taken to be @code{1}. @var{DIM} is a scaler of type @code{INTEGER} in the
-range of @math{1 /leq DIM /leq n)} where @math{n} is the rank of @var{ARRAY}.
+taken to be @code{1}. @var{DIM} is a scalar of type @code{INTEGER} in the
+range of @math{1 \leq DIM \leq n)} where @math{n} is the rank of @var{ARRAY}.
If the rank of @var{ARRAY} is one, then all elements of @var{ARRAY} are shifted
by @var{SHIFT} places. If rank is greater than one, then all complete rank one
sections of @var{ARRAY} along the given dimension are shifted. Elements
shifted out one end of each rank one section are shifted back in the other end.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
-transformational function
+Transformational function
@item @emph{Syntax}:
-@code{A = CSHIFT(A, SHIFT[,DIM])}
+@code{RESULT = CSHIFT(ARRAY, SHIFT [, DIM])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{ARRAY} @tab May be any type, not scaler.
+@multitable @columnfractions .15 .70
+@item @var{ARRAY} @tab Shall be an array of any type.
@item @var{SHIFT} @tab The type shall be @code{INTEGER}.
@item @var{DIM} @tab The type shall be @code{INTEGER}.
@end multitable
@end table
+
@node CTIME
@section @code{CTIME} --- Convert a time into a string
-@cindex @code{CTIME} intrinsic
-@cindex time, conversion function
+@fnindex CTIME
+@cindex time, conversion to string
+@cindex conversion, to string
@table @asis
@item @emph{Description}:
-@code{CTIME(T,S)} converts @var{T}, a system time value, such as returned
-by @code{TIME8()}, to a string of the form @samp{Sat Aug 19 18:13:14
-1995}, and returns that string into @var{S}.
+@code{CTIME} converts a system time value, such as returned by
+@code{TIME8()}, to a string of the form @samp{Sat Aug 19 18:13:14 1995}.
-If @code{CTIME} is invoked as a function, it can not be invoked as a
-subroutine, and vice versa.
-
-@var{T} is an @code{INTENT(IN)} @code{INTEGER(KIND=8)} variable.
-@var{S} is an @code{INTENT(OUT)} @code{CHARACTER} variable.
+This intrinsic is provided in both subroutine and function forms; however,
+only one form can be used in any given program unit.
@item @emph{Standard}:
GNU extension
@item @emph{Class}:
-Subroutine
+Subroutine, function
@item @emph{Syntax}:
@multitable @columnfractions .80
-@item @code{CALL CTIME(T,S)}.
-@item @code{S = CTIME(T)}, (not recommended).
+@item @code{CALL CTIME(TIME, RESULT)}.
+@item @code{RESULT = CTIME(TIME)}, (not recommended).
@end multitable
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{S}@tab The type shall be of type @code{CHARACTER}.
-@item @var{T}@tab The type shall be of type @code{INTEGER(KIND=8)}.
+@multitable @columnfractions .15 .70
+@item @var{TIME} @tab The type shall be of type @code{INTEGER(KIND=8)}.
+@item @var{RESULT} @tab The type shall be of type @code{CHARACTER} and
+of default kind.
@end multitable
@item @emph{Return value}:
print *, 'Program was started on ', date
end program test_ctime
@end smallexample
+
+@item @emph{See Also}:
+@ref{GMTIME}, @ref{LTIME}, @ref{TIME}, @ref{TIME8}
@end table
+
+
@node DATE_AND_TIME
@section @code{DATE_AND_TIME} --- Date and time subroutine
-@cindex @code{DATE_AND_TIME} intrinsic
+@fnindex DATE_AND_TIME
@cindex date, current
@cindex current date
@cindex time, current
@var{VALUES} is @code{INTENT(OUT)} and provides the following:
-@multitable @columnfractions .15 .30 .60
+@multitable @columnfractions .15 .30 .40
@item @tab @code{VALUE(1)}: @tab The year
@item @tab @code{VALUE(2)}: @tab The month
@item @tab @code{VALUE(3)}: @tab The day of the month
@item @tab @code{VALUE(6)}: @tab The minutes of the hour
@item @tab @code{VALUE(7)}: @tab The seconds of the minute
@item @tab @code{VALUE(8)}: @tab The milliseconds of the second
-@end multitable
+@end multitable
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Subroutine
@code{CALL DATE_AND_TIME([DATE, TIME, ZONE, VALUES])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{DATE} @tab (Optional) The type shall be @code{CHARACTER(8)} or larger.
-@item @var{TIME} @tab (Optional) The type shall be @code{CHARACTER(10)} or larger.
-@item @var{ZONE} @tab (Optional) The type shall be @code{CHARACTER(5)} or larger.
+@multitable @columnfractions .15 .70
+@item @var{DATE} @tab (Optional) The type shall be @code{CHARACTER(LEN=8)}
+or larger, and of default kind.
+@item @var{TIME} @tab (Optional) The type shall be @code{CHARACTER(LEN=10)}
+or larger, and of default kind.
+@item @var{ZONE} @tab (Optional) The type shall be @code{CHARACTER(LEN=5)}
+or larger, and of default kind.
@item @var{VALUES}@tab (Optional) The type shall be @code{INTEGER(8)}.
@end multitable
print '(8i5))', values
end program test_time_and_date
@end smallexample
+
+@item @emph{See also}:
+@ref{CPU_TIME}, @ref{SYSTEM_CLOCK}
@end table
@node DBLE
@section @code{DBLE} --- Double conversion function
-@cindex @code{DBLE} intrinsic
-@cindex double conversion
+@fnindex DBLE
+@cindex conversion, to real
@table @asis
@item @emph{Description}:
-@code{DBLE(X)} Converts @var{X} to double precision real type.
+@code{DBLE(A)} Converts @var{A} to double precision real type.
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = DBLE(X)}
+@code{RESULT = DBLE(A)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{INTEGER(*)}, @code{REAL(*)}, or @code{COMPLEX(*)}.
+@multitable @columnfractions .15 .70
+@item @var{A} @tab The type shall be @code{INTEGER}, @code{REAL},
+or @code{COMPLEX}.
@end multitable
@item @emph{Return value}:
@node DCMPLX
@section @code{DCMPLX} --- Double complex conversion function
-@cindex @code{DCMPLX} intrinsic
+@fnindex DCMPLX
@cindex complex numbers, conversion to
+@cindex conversion, to complex
@table @asis
@item @emph{Description}:
Elemental function
@item @emph{Syntax}:
-@code{C = DCMPLX(X)}
-@code{C = DCMPLX(X,Y)}
+@code{RESULT = DCMPLX(X [, Y])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type may be @code{INTEGER(*)}, @code{REAL(*)}, or @code{COMPLEX(*)}.
-@item @var{Y} @tab Optional if @var{X} is not @code{COMPLEX(*)}. May be @code{INTEGER(*)} or @code{REAL(*)}.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type may be @code{INTEGER}, @code{REAL},
+or @code{COMPLEX}.
+@item @var{Y} @tab (Optional if @var{X} is not @code{COMPLEX}.) May be
+@code{INTEGER} or @code{REAL}.
@end multitable
@item @emph{Return value}:
@node DFLOAT
@section @code{DFLOAT} --- Double conversion function
-@cindex @code{DFLOAT} intrinsic
-@cindex double float conversion
+@fnindex DFLOAT
+@cindex conversion, to real
@table @asis
@item @emph{Description}:
-@code{DFLOAT(X)} Converts @var{X} to double precision real type.
+@code{DFLOAT(A)} Converts @var{A} to double precision real type.
@item @emph{Standard}:
GNU extension
Elemental function
@item @emph{Syntax}:
-@code{X = DFLOAT(X)}
+@code{RESULT = DFLOAT(A)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{INTEGER(*)}.
+@multitable @columnfractions .15 .70
+@item @var{A} @tab The type shall be @code{INTEGER}.
@end multitable
@item @emph{Return value}:
@node DIGITS
-@section @code{DIGITS} --- Significant digits function
-@cindex @code{DIGITS} intrinsic
-@cindex digits, significant
+@section @code{DIGITS} --- Significant binary digits function
+@fnindex DIGITS
+@cindex model representation, significant digits
@table @asis
@item @emph{Description}:
-@code{DIGITS(X)} returns the number of significant digits of the internal model
-representation of @var{X}. For example, on a system using a 32-bit
+@code{DIGITS(X)} returns the number of significant binary digits of the internal
+model representation of @var{X}. For example, on a system using a 32-bit
floating point representation, a default real number would likely return 24.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Inquiry function
@item @emph{Syntax}:
-@code{C = DIGITS(X)}
+@code{RESULT = DIGITS(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type may be @code{INTEGER(*)} or @code{REAL(*)}.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type may be @code{INTEGER} or @code{REAL}.
@end multitable
@item @emph{Return value}:
@node DIM
-@section @code{DIM} --- Dim function
-@cindex @code{DIM} intrinsic
-@cindex @code{IDIM} intrinsic
-@cindex @code{DDIM} intrinsic
-@cindex dim
+@section @code{DIM} --- Positive difference
+@fnindex DIM
+@fnindex IDIM
+@fnindex DDIM
+@cindex positive difference
@table @asis
@item @emph{Description}:
otherwise returns zero.
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = DIM(X,Y)}
+@code{RESULT = DIM(X, Y)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{INTEGER(*)} or @code{REAL(*)}
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be @code{INTEGER} or @code{REAL}
@item @var{Y} @tab The type shall be the same type and kind as @var{X}.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{INTEGER(*)} or @code{REAL(*)}.
+The return value is of type @code{INTEGER} or @code{REAL}.
@item @emph{Example}:
@smallexample
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
-@item @code{IDIM(X,Y)} @tab @code{INTEGER(4) X,Y} @tab @code{INTEGER(4)} @tab F77 and later
-@item @code{DDIM(X,Y)} @tab @code{REAL(8) X,Y} @tab @code{REAL(8)} @tab F77 and later
+@item @code{IDIM(X,Y)} @tab @code{INTEGER(4) X,Y} @tab @code{INTEGER(4)} @tab Fortran 77 and later
+@item @code{DDIM(X,Y)} @tab @code{REAL(8) X,Y} @tab @code{REAL(8)} @tab Fortran 77 and later
@end multitable
@end table
@node DOT_PRODUCT
@section @code{DOT_PRODUCT} --- Dot product function
-@cindex @code{DOT_PRODUCT} intrinsic
+@fnindex DOT_PRODUCT
@cindex dot product
+@cindex vector product
+@cindex product, vector
@table @asis
@item @emph{Description}:
-@code{DOT_PRODUCT(X,Y)} computes the dot product multiplication of two vectors
-@var{X} and @var{Y}. The two vectors may be either numeric or logical
-and must be arrays of rank one and of equal size. If the vectors are
-@code{INTEGER(*)} or @code{REAL(*)}, the result is @code{SUM(X*Y)}. If the
-vectors are @code{COMPLEX(*)}, the result is @code{SUM(CONJG(X)*Y)}. If the
-vectors are @code{LOGICAL}, the result is @code{ANY(X.AND.Y)}.
+@code{DOT_PRODUCT(VECTOR_A, VECTOR_B)} computes the dot product multiplication
+of two vectors @var{VECTOR_A} and @var{VECTOR_B}. The two vectors may be
+either numeric or logical and must be arrays of rank one and of equal size. If
+the vectors are @code{INTEGER} or @code{REAL}, the result is
+@code{SUM(VECTOR_A*VECTOR_B)}. If the vectors are @code{COMPLEX}, the result
+is @code{SUM(CONJG(VECTOR_A)*VECTOR_B)}. If the vectors are @code{LOGICAL},
+the result is @code{ANY(VECTOR_A .AND. VECTOR_B)}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
-transformational function
+Transformational function
@item @emph{Syntax}:
-@code{S = DOT_PRODUCT(X,Y)}
+@code{RESULT = DOT_PRODUCT(VECTOR_A, VECTOR_B)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be numeric or @code{LOGICAL}, rank 1.
-@item @var{Y} @tab The type shall be numeric or @code{LOGICAL}, rank 1.
+@multitable @columnfractions .15 .70
+@item @var{VECTOR_A} @tab The type shall be numeric or @code{LOGICAL}, rank 1.
+@item @var{VECTOR_B} @tab The type shall be numeric if @var{VECTOR_A} is of numeric type or @code{LOGICAL} if @var{VECTOR_A} is of type @code{LOGICAL}. @var{VECTOR_B} shall be a rank-one array.
@end multitable
@item @emph{Return value}:
-If the arguments are numeric, the return value is a scaler of numeric type,
-@code{INTEGER(*)}, @code{REAL(*)}, or @code{COMPLEX(*)}. If the arguments are
+If the arguments are numeric, the return value is a scalar of numeric type,
+@code{INTEGER}, @code{REAL}, or @code{COMPLEX}. If the arguments are
@code{LOGICAL}, the return value is @code{.TRUE.} or @code{.FALSE.}.
@item @emph{Example}:
@node DPROD
@section @code{DPROD} --- Double product function
-@cindex @code{DPROD} intrinsic
-@cindex double-precision product
+@fnindex DPROD
+@cindex product, double-precision
@table @asis
@item @emph{Description}:
@code{DPROD(X,Y)} returns the product @code{X*Y}.
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{D = DPROD(X,Y)}
+@code{RESULT = DPROD(X, Y)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
+@multitable @columnfractions .15 .70
@item @var{X} @tab The type shall be @code{REAL}.
@item @var{Y} @tab The type shall be @code{REAL}.
@end multitable
@item @emph{Example}:
@smallexample
program test_dprod
- integer :: i
real :: x = 5.2
real :: y = 2.3
real(8) :: d
@node DREAL
@section @code{DREAL} --- Double real part function
-@cindex @code{DREAL} intrinsic
-@cindex double-precision real part
+@fnindex DREAL
+@cindex complex numbers, real part
@table @asis
@item @emph{Description}:
Elemental function
@item @emph{Syntax}:
-@code{D = DREAL(Z)}
+@code{RESULT = DREAL(A)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{Z} @tab The type shall be @code{COMPLEX(8)}.
+@multitable @columnfractions .15 .70
+@item @var{A} @tab The type shall be @code{COMPLEX(8)}.
@end multitable
@item @emph{Return value}:
@node DTIME
@section @code{DTIME} --- Execution time subroutine (or function)
-@cindex @code{DTIME} intrinsic
+@fnindex DTIME
@cindex time, elapsed
@cindex elapsed time
@table @asis
@item @emph{Description}:
-@code{DTIME(TARRAY, RESULT)} initially returns the number of seconds of runtime
-since the start of the process's execution in @var{RESULT}. @var{TARRAY}
-returns the user and system components of this time in @code{TARRAY(1)} and
-@code{TARRAY(2)} respectively. @var{RESULT} is equal to @code{TARRAY(1) +
-TARRAY(2)}.
+@code{DTIME(VALUES, TIME)} initially returns the number of seconds of runtime
+since the start of the process's execution in @var{TIME}. @var{VALUES}
+returns the user and system components of this time in @code{VALUES(1)} and
+@code{VALUES(2)} respectively. @var{TIME} is equal to @code{VALUES(1) +
+VALUES(2)}.
Subsequent invocations of @code{DTIME} return values accumulated since the
previous invocation.
become, negative, or numerically less than previous values, during a single
run of the compiled program.
-If @code{DTIME} is invoked as a function, it can not be invoked as a
-subroutine, and vice versa.
+Please note, that this implementation is thread safe if used within OpenMP
+directives, i.e., its state will be consistent while called from multiple
+threads. However, if @code{DTIME} is called from multiple threads, the result
+is still the time since the last invocation. This may not give the intended
+results. If possible, use @code{CPU_TIME} instead.
+
+This intrinsic is provided in both subroutine and function forms; however,
+only one form can be used in any given program unit.
-@var{TARRAY} and @var{RESULT} are @code{INTENT(OUT)} and provide the following:
+@var{VALUES} and @var{TIME} are @code{INTENT(OUT)} and provide the following:
-@multitable @columnfractions .15 .30 .60
-@item @tab @code{TARRAY(1)}: @tab User time in seconds.
-@item @tab @code{TARRAY(2)}: @tab System time in seconds.
-@item @tab @code{RESULT}: @tab Run time since start in seconds.
+@multitable @columnfractions .15 .30 .40
+@item @tab @code{VALUES(1)}: @tab User time in seconds.
+@item @tab @code{VALUES(2)}: @tab System time in seconds.
+@item @tab @code{TIME}: @tab Run time since start in seconds.
@end multitable
@item @emph{Standard}:
GNU extension
@item @emph{Class}:
-Subroutine
+Subroutine, function
@item @emph{Syntax}:
@multitable @columnfractions .80
-@item @code{CALL DTIME(TARRAY, RESULT)}.
-@item @code{RESULT = DTIME(TARRAY)}, (not recommended).
+@item @code{CALL DTIME(VALUES, TIME)}.
+@item @code{TIME = DTIME(VALUES)}, (not recommended).
@end multitable
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{TARRAY}@tab The type shall be @code{REAL, DIMENSION(2)}.
-@item @var{RESULT}@tab The type shall be @code{REAL}.
+@multitable @columnfractions .15 .70
+@item @var{VALUES}@tab The type shall be @code{REAL(4), DIMENSION(2)}.
+@item @var{TIME}@tab The type shall be @code{REAL(4)}.
@end multitable
@item @emph{Return value}:
-Elapsed time in seconds since the start of program execution.
+Elapsed time in seconds since the last invocation or since the start of program
+execution if not called before.
@item @emph{Example}:
@smallexample
print *, tarray(2)
end program test_dtime
@end smallexample
+
+@item @emph{See also}:
+@ref{CPU_TIME}
+
@end table
@node EOSHIFT
-@section @code{EOSHIFT} --- End-off shift function
-@cindex @code{EOSHIFT} intrinsic
-@cindex bit operations
+@section @code{EOSHIFT} --- End-off shift elements of an array
+@fnindex EOSHIFT
+@cindex array, shift
@table @asis
@item @emph{Description}:
-@code{EOSHIFT(ARRAY, SHIFT[,BOUNDARY, DIM])} performs an end-off shift on
+@code{EOSHIFT(ARRAY, SHIFT[, BOUNDARY, DIM])} performs an end-off shift on
elements of @var{ARRAY} along the dimension of @var{DIM}. If @var{DIM} is
-omitted it is taken to be @code{1}. @var{DIM} is a scaler of type
-@code{INTEGER} in the range of @math{1 /leq DIM /leq n)} where @math{n} is the
+omitted it is taken to be @code{1}. @var{DIM} is a scalar of type
+@code{INTEGER} in the range of @math{1 \leq DIM \leq n)} where @math{n} is the
rank of @var{ARRAY}. If the rank of @var{ARRAY} is one, then all elements of
@var{ARRAY} are shifted by @var{SHIFT} places. If rank is greater than one,
then all complete rank one sections of @var{ARRAY} along the given dimension are
@end multitable
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
-transformational function
+Transformational function
@item @emph{Syntax}:
-@code{A = EOSHIFT(A, SHIFT[,BOUNDARY, DIM])}
+@code{RESULT = EOSHIFT(ARRAY, SHIFT [, BOUNDARY, DIM])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{ARRAY} @tab May be any type, not scaler.
+@multitable @columnfractions .15 .70
+@item @var{ARRAY} @tab May be any type, not scalar.
@item @var{SHIFT} @tab The type shall be @code{INTEGER}.
@item @var{BOUNDARY} @tab Same type as @var{ARRAY}.
@item @var{DIM} @tab The type shall be @code{INTEGER}.
@node EPSILON
@section @code{EPSILON} --- Epsilon function
-@cindex @code{EPSILON} intrinsic
-@cindex epsilon, significant
+@fnindex EPSILON
+@cindex model representation, epsilon
@table @asis
@item @emph{Description}:
-@code{EPSILON(X)} returns a nearly negligible number relative to @code{1}.
+@code{EPSILON(X)} returns the smallest number @var{E} of the same kind
+as @var{X} such that @math{1 + E > 1}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Inquiry function
@item @emph{Syntax}:
-@code{C = EPSILON(X)}
+@code{RESULT = EPSILON(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)}.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be @code{REAL}.
@end multitable
@item @emph{Return value}:
@node ERF
@section @code{ERF} --- Error function
-@cindex @code{ERF} intrinsic
+@fnindex ERF
@cindex error function
@table @asis
@code{ERF(X)} computes the error function of @var{X}.
@item @emph{Standard}:
-GNU Extension
+Fortran 2008 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = ERF(X)}
+@code{RESULT = ERF(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)}, and it shall be scalar.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be @code{REAL}.
@end multitable
@item @emph{Return value}:
-The return value is a scalar of type @code{REAL(*)} and it is positive
-(@math{ - 1 \leq erf (x) \leq 1 }.
+The return value is of type @code{REAL}, of the same kind as
+@var{X} and lies in the range @math{-1 \leq erf (x) \leq 1 }.
@item @emph{Example}:
@smallexample
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
@item @code{DERF(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab GNU extension
@end multitable
@node ERFC
@section @code{ERFC} --- Error function
-@cindex @code{ERFC} intrinsic
-@cindex error function
+@fnindex ERFC
+@cindex error function, complementary
@table @asis
@item @emph{Description}:
@code{ERFC(X)} computes the complementary error function of @var{X}.
@item @emph{Standard}:
-GNU extension
+Fortran 2008 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = ERFC(X)}
+@code{RESULT = ERFC(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)}, and it shall be scalar.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be @code{REAL}.
@end multitable
@item @emph{Return value}:
-The return value is a scalar of type @code{REAL(*)} and it is positive
-(@math{ 0 \leq erfc (x) \leq 2 }.
+The return value is of type @code{REAL} and of the same kind as @var{X}.
+It lies in the range @math{ 0 \leq erfc (x) \leq 2 }.
@item @emph{Example}:
@smallexample
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
@item @code{DERFC(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab GNU extension
@end multitable
+@node ERFC_SCALED
+@section @code{ERFC_SCALED} --- Error function
+@fnindex ERFC_SCALED
+@cindex error function, complementary, exponentially-scaled
+
+@table @asis
+@item @emph{Description}:
+@code{ERFC_SCALED(X)} computes the exponentially-scaled complementary
+error function of @var{X}.
+
+@item @emph{Standard}:
+Fortran 2008 and later
+
+@item @emph{Class}:
+Elemental function
+
+@item @emph{Syntax}:
+@code{RESULT = ERFC_SCALED(X)}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be @code{REAL}.
+@end multitable
+
+@item @emph{Return value}:
+The return value is of type @code{REAL} and of the same kind as @var{X}.
+
+@item @emph{Example}:
+@smallexample
+program test_erfc_scaled
+ real(8) :: x = 0.17_8
+ x = erfc_scaled(x)
+end program test_erfc_scaled
+@end smallexample
+@end table
+
+
+
@node ETIME
@section @code{ETIME} --- Execution time subroutine (or function)
-@cindex @code{ETIME} intrinsic
+@fnindex ETIME
@cindex time, elapsed
@table @asis
@item @emph{Description}:
-@code{ETIME(TARRAY, RESULT)} returns the number of seconds of runtime
-since the start of the process's execution in @var{RESULT}. @var{TARRAY}
-returns the user and system components of this time in @code{TARRAY(1)} and
-@code{TARRAY(2)} respectively. @var{RESULT} is equal to @code{TARRAY(1) + TARRAY(2)}.
+@code{ETIME(VALUES, TIME)} returns the number of seconds of runtime
+since the start of the process's execution in @var{TIME}. @var{VALUES}
+returns the user and system components of this time in @code{VALUES(1)} and
+@code{VALUES(2)} respectively. @var{TIME} is equal to @code{VALUES(1) + VALUES(2)}.
On some systems, the underlying timings are represented using types with
sufficiently small limits that overflows (wrap around) are possible, such as
become, negative, or numerically less than previous values, during a single
run of the compiled program.
-If @code{ETIME} is invoked as a function, it can not be invoked as a
-subroutine, and vice versa.
+This intrinsic is provided in both subroutine and function forms; however,
+only one form can be used in any given program unit.
-@var{TARRAY} and @var{RESULT} are @code{INTENT(OUT)} and provide the following:
+@var{VALUES} and @var{TIME} are @code{INTENT(OUT)} and provide the following:
@multitable @columnfractions .15 .30 .60
-@item @tab @code{TARRAY(1)}: @tab User time in seconds.
-@item @tab @code{TARRAY(2)}: @tab System time in seconds.
-@item @tab @code{RESULT}: @tab Run time since start in seconds.
+@item @tab @code{VALUES(1)}: @tab User time in seconds.
+@item @tab @code{VALUES(2)}: @tab System time in seconds.
+@item @tab @code{TIME}: @tab Run time since start in seconds.
@end multitable
@item @emph{Standard}:
GNU extension
@item @emph{Class}:
-Subroutine
+Subroutine, function
@item @emph{Syntax}:
-@multitable @columnfractions .8
-@item @code{CALL ETIME(TARRAY, RESULT)}.
-@item @code{RESULT = ETIME(TARRAY)}, (not recommended).
+@multitable @columnfractions .80
+@item @code{CALL ETIME(VALUES, TIME)}.
+@item @code{TIME = ETIME(VALUES)}, (not recommended).
@end multitable
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{TARRAY}@tab The type shall be @code{REAL, DIMENSION(2)}.
-@item @var{RESULT}@tab The type shall be @code{REAL}.
+@multitable @columnfractions .15 .70
+@item @var{VALUES}@tab The type shall be @code{REAL(4), DIMENSION(2)}.
+@item @var{TIME}@tab The type shall be @code{REAL(4)}.
@end multitable
@item @emph{Return value}:
@node EXIT
@section @code{EXIT} --- Exit the program with status.
-@cindex @code{EXIT} intrinsic
-@cindex exit program
+@fnindex EXIT
+@cindex program termination
+@cindex terminate program
@table @asis
@item @emph{Description}:
@code{CALL EXIT([STATUS])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{STATUS} @tab The type of the argument shall be @code{INTEGER(*)}.
+@multitable @columnfractions .15 .70
+@item @var{STATUS} @tab Shall be an @code{INTEGER} of the default kind.
@end multitable
@item @emph{Return value}:
@node EXP
@section @code{EXP} --- Exponential function
-@cindex @code{EXP} intrinsic
-@cindex @code{DEXP} intrinsic
-@cindex @code{ZEXP} intrinsic
-@cindex @code{CDEXP} intrinsic
-@cindex exponential
+@fnindex EXP
+@fnindex DEXP
+@fnindex CEXP
+@fnindex ZEXP
+@fnindex CDEXP
+@cindex exponential function
+@cindex logarithmic function, inverse
@table @asis
@item @emph{Description}:
@code{EXP(X)} computes the base @math{e} exponential of @var{X}.
@item @emph{Standard}:
-F77 and later, has overloads that are GNU extensions
+Fortran 77 and later, has overloads that are GNU extensions
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = EXP(X)}
+@code{RESULT = EXP(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)} or
-@code{COMPLEX(*)}.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be @code{REAL} or
+@code{COMPLEX}.
@end multitable
@item @emph{Return value}:
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
-@item @code{DEXP(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab F77 and later
-@item @code{CEXP(X)} @tab @code{COMPLEX(4) X} @tab @code{COMPLEX(4)} @tab F77 and later
+@item @code{DEXP(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab Fortran 77 and later
+@item @code{CEXP(X)} @tab @code{COMPLEX(4) X} @tab @code{COMPLEX(4)} @tab Fortran 77 and later
@item @code{ZEXP(X)} @tab @code{COMPLEX(8) X} @tab @code{COMPLEX(8)} @tab GNU extension
@item @code{CDEXP(X)} @tab @code{COMPLEX(8) X} @tab @code{COMPLEX(8)} @tab GNU extension
@end multitable
@node EXPONENT
@section @code{EXPONENT} --- Exponent function
-@cindex @code{EXPONENT} intrinsic
-@cindex exponent part of a real number
+@fnindex EXPONENT
+@cindex real number, exponent
+@cindex floating point, exponent
@table @asis
@item @emph{Description}:
is zero the value returned is zero.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{I = EXPONENT(X)}
+@code{RESULT = EXPONENT(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)}.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be @code{REAL}.
@end multitable
@item @emph{Return value}:
@end table
+
@node FDATE
@section @code{FDATE} --- Get the current time as a string
-@cindex @code{FDATE} intrinsic
+@fnindex FDATE
@cindex time, current
@cindex current time
@cindex date, current
@code{CTIME}) in @var{DATE}. It is equivalent to @code{CALL CTIME(DATE,
TIME())}.
-If @code{FDATE} is invoked as a function, it can not be invoked as a
-subroutine, and vice versa.
+This intrinsic is provided in both subroutine and function forms; however,
+only one form can be used in any given program unit.
-@var{DATE} is an @code{INTENT(OUT)} @code{CHARACTER} variable.
+@var{DATE} is an @code{INTENT(OUT)} @code{CHARACTER} variable of the
+default kind.
@item @emph{Standard}:
GNU extension
@item @emph{Class}:
-Subroutine
+Subroutine, function
@item @emph{Syntax}:
@multitable @columnfractions .80
@end multitable
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{DATE}@tab The type shall be of type @code{CHARACTER}.
+@multitable @columnfractions .15 .70
+@item @var{DATE}@tab The type shall be of type @code{CHARACTER} of the
+default kind
@end multitable
@item @emph{Return value}:
@end smallexample
@end table
-@node FLOAT
+
+@node FLOAT
@section @code{FLOAT} --- Convert integer to default real
-@cindex @code{FLOAT} intrinsic
-@cindex conversion function (float)
+@fnindex FLOAT
+@cindex conversion, to real
@table @asis
@item @emph{Description}:
-@code{FLOAT(I)} converts the integer @var{I} to a default real value.
+@code{FLOAT(A)} converts the integer @var{A} to a default real value.
@item @emph{Standard}:
-GNU extension
+Fortran 77 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = FLOAT(I)}
+@code{RESULT = FLOAT(A)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{I} @tab The type shall be @code{INTEGER(*)}.
+@multitable @columnfractions .15 .70
+@item @var{A} @tab The type shall be @code{INTEGER}.
@end multitable
@item @emph{Return value}:
-The return value is of type default @code{REAL}
+The return value is of type default @code{REAL}.
@item @emph{Example}:
@smallexample
@node FGET
@section @code{FGET} --- Read a single character in stream mode from stdin
-@cindex @code{FGET} intrinsic
-@cindex file operations
-@cindex stream operations
+@fnindex FGET
+@cindex read character, stream mode
+@cindex stream mode, read character
+@cindex file operation, read character
@table @asis
@item @emph{Description}:
formatted output. Stream I/O should not be mixed with normal record-oriented
(formatted or unformatted) I/O on the same unit; the results are unpredictable.
-This intrinsic routine is provided for backwards compatibility with
+This intrinsic is provided in both subroutine and function forms; however,
+only one form can be used in any given program unit.
+
+Note that the @code{FGET} intrinsic is provided for backwards compatibility with
@command{g77}. GNU Fortran provides the Fortran 2003 Stream facility.
Programmers should consider the use of new stream IO feature in new code
for future portability. See also @ref{Fortran 2003 status}.
GNU extension
@item @emph{Class}:
-Non-elemental subroutine
+Subroutine, function
@item @emph{Syntax}:
-@code{CALL FGET(C[,STATUS])}
+@code{CALL FGET(C [, STATUS])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{C} @tab The type shall be @code{CHARACTER}.
-@item @var{STATUS} @tab (Optional) status flag of type @code{INTEGER}. Returns 0 on success,
- -1 on end-of-file and a system specific positive error code otherwise.
+@multitable @columnfractions .15 .70
+@item @var{C} @tab The type shall be @code{CHARACTER} and of default
+kind.
+@item @var{STATUS} @tab (Optional) status flag of type @code{INTEGER}.
+Returns 0 on success, -1 on end-of-file, and a system specific positive
+error code otherwise.
@end multitable
@item @emph{Example}:
@end table
+
@node FGETC
@section @code{FGETC} --- Read a single character in stream mode
-@cindex @code{FGETC} intrinsic
-@cindex file operations
-@cindex stream operations
+@fnindex FGETC
+@cindex read character, stream mode
+@cindex stream mode, read character
+@cindex file operation, read character
@table @asis
@item @emph{Description}:
Stream I/O should not be mixed with normal record-oriented (formatted or
unformatted) I/O on the same unit; the results are unpredictable.
-This intrinsic routine is provided for backwards compatibility with
-@command{g77}. GNU Fortran provides the Fortran 2003 Stream facility.
+This intrinsic is provided in both subroutine and function forms; however,
+only one form can be used in any given program unit.
+
+Note that the @code{FGET} intrinsic is provided for backwards compatibility
+with @command{g77}. GNU Fortran provides the Fortran 2003 Stream facility.
Programmers should consider the use of new stream IO feature in new code
for future portability. See also @ref{Fortran 2003 status}.
GNU extension
@item @emph{Class}:
-Non-elemental subroutine
+Subroutine, function
@item @emph{Syntax}:
-@code{CALL FGETC(UNIT,C[,STATUS])}
+@code{CALL FGETC(UNIT, C [, STATUS])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
+@multitable @columnfractions .15 .70
@item @var{UNIT} @tab The type shall be @code{INTEGER}.
-@item @var{C} @tab The type shall be @code{CHARACTER}.
-@item @var{STATUS} @tab (Optional) status flag of type @code{INTEGER}. Returns 0 on success,
- -1 on end-of-file and a system specific positive error code otherwise.
+@item @var{C} @tab The type shall be @code{CHARACTER} and of default
+kind.
+@item @var{STATUS} @tab (Optional) status flag of type @code{INTEGER}.
+Returns 0 on success, -1 on end-of-file and a system specific positive
+error code otherwise.
@end multitable
@item @emph{Example}:
@node FLOOR
@section @code{FLOOR} --- Integer floor function
-@cindex @code{FLOOR} intrinsic
+@fnindex FLOOR
@cindex floor
+@cindex rounding, floor
@table @asis
@item @emph{Description}:
-@code{FLOOR(X)} returns the greatest integer less than or equal to @var{X}.
+@code{FLOOR(A)} returns the greatest integer less than or equal to @var{X}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{I = FLOOR(X[,KIND])}
+@code{RESULT = FLOOR(A [, KIND])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)}.
-@item @var{KIND} @tab Optional scaler integer initialization expression.
+@multitable @columnfractions .15 .70
+@item @var{A} @tab The type shall be @code{REAL}.
+@item @var{KIND} @tab (Optional) An @code{INTEGER} initialization
+expression indicating the kind parameter of the result.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{INTEGER(KIND)}
+The return value is of type @code{INTEGER(KIND)} if @var{KIND} is present
+and of default-kind @code{INTEGER} otherwise.
@item @emph{Example}:
@smallexample
@node FLUSH
@section @code{FLUSH} --- Flush I/O unit(s)
-@cindex @code{FLUSH} intrinsic
-@cindex flush output files
+@fnindex FLUSH
+@cindex file operation, flush
@table @asis
@item @emph{Description}:
GNU extension
@item @emph{Class}:
-non-elemental subroutine
+Subroutine
@item @emph{Syntax}:
@code{CALL FLUSH(UNIT)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
+@multitable @columnfractions .15 .70
@item @var{UNIT} @tab (Optional) The type shall be @code{INTEGER}.
@end multitable
@node FNUM
@section @code{FNUM} --- File number function
-@cindex @code{FNUM} intrinsic
-@cindex fnum
+@fnindex FNUM
+@cindex file operation, file number
@table @asis
@item @emph{Description}:
GNU extension
@item @emph{Class}:
-non-elemental function
+Function
@item @emph{Syntax}:
-@code{I = FNUM(UNIT)}
+@code{RESULT = FNUM(UNIT)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
+@multitable @columnfractions .15 .70
@item @var{UNIT} @tab The type shall be @code{INTEGER}.
@end multitable
@node FPUT
@section @code{FPUT} --- Write a single character in stream mode to stdout
-@cindex @code{FPUT} intrinsic
-@cindex file operations
-@cindex stream operations
+@fnindex FPUT
+@cindex write character, stream mode
+@cindex stream mode, write character
+@cindex file operation, write character
@table @asis
@item @emph{Description}:
formatted output. Stream I/O should not be mixed with normal record-oriented
(formatted or unformatted) I/O on the same unit; the results are unpredictable.
-This intrinsic routine is provided for backwards compatibility with
+This intrinsic is provided in both subroutine and function forms; however,
+only one form can be used in any given program unit.
+
+Note that the @code{FGET} intrinsic is provided for backwards compatibility with
@command{g77}. GNU Fortran provides the Fortran 2003 Stream facility.
Programmers should consider the use of new stream IO feature in new code
for future portability. See also @ref{Fortran 2003 status}.
GNU extension
@item @emph{Class}:
-Non-elemental subroutine
+Subroutine, function
@item @emph{Syntax}:
-@code{CALL FPUT(C[,STATUS])}
+@code{CALL FPUT(C [, STATUS])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{C} @tab The type shall be @code{CHARACTER}.
-@item @var{STATUS} @tab (Optional) status flag of type @code{INTEGER}. Returns 0 on success,
- -1 on end-of-file and a system specific positive error code otherwise.
+@multitable @columnfractions .15 .70
+@item @var{C} @tab The type shall be @code{CHARACTER} and of default
+kind.
+@item @var{STATUS} @tab (Optional) status flag of type @code{INTEGER}.
+Returns 0 on success, -1 on end-of-file and a system specific positive
+error code otherwise.
@end multitable
@item @emph{Example}:
@smallexample
PROGRAM test_fput
- CHARACTER(len=*) :: str = "gfortran"
+ CHARACTER(len=10) :: str = "gfortran"
INTEGER :: i
DO i = 1, len_trim(str)
CALL fput(str(i:i))
@node FPUTC
@section @code{FPUTC} --- Write a single character in stream mode
-@cindex @code{FPUTC} intrinsic
-@cindex file operations
-@cindex stream operations
+@fnindex FPUTC
+@cindex write character, stream mode
+@cindex stream mode, write character
+@cindex file operation, write character
@table @asis
@item @emph{Description}:
output. Stream I/O should not be mixed with normal record-oriented
(formatted or unformatted) I/O on the same unit; the results are unpredictable.
-This intrinsic routine is provided for backwards compatibility with
+This intrinsic is provided in both subroutine and function forms; however,
+only one form can be used in any given program unit.
+
+Note that the @code{FGET} intrinsic is provided for backwards compatibility with
@command{g77}. GNU Fortran provides the Fortran 2003 Stream facility.
Programmers should consider the use of new stream IO feature in new code
for future portability. See also @ref{Fortran 2003 status}.
GNU extension
@item @emph{Class}:
-Non-elemental subroutine
+Subroutine, function
@item @emph{Syntax}:
-@code{CALL FPUTC(UNIT,C[,STATUS])}
+@code{CALL FPUTC(UNIT, C [, STATUS])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
+@multitable @columnfractions .15 .70
@item @var{UNIT} @tab The type shall be @code{INTEGER}.
-@item @var{C} @tab The type shall be @code{CHARACTER}.
-@item @var{STATUS} @tab (Optional) status flag of type @code{INTEGER}. Returns 0 on success,
- -1 on end-of-file and a system specific positive error code otherwise.
+@item @var{C} @tab The type shall be @code{CHARACTER} and of default
+kind.
+@item @var{STATUS} @tab (Optional) status flag of type @code{INTEGER}.
+Returns 0 on success, -1 on end-of-file and a system specific positive
+error code otherwise.
@end multitable
@item @emph{Example}:
@smallexample
PROGRAM test_fputc
- CHARACTER(len=*) :: str = "gfortran"
+ CHARACTER(len=10) :: str = "gfortran"
INTEGER :: fd = 42, i
OPEN(UNIT = fd, FILE = "out", ACTION = "WRITE", STATUS="NEW")
@node FRACTION
@section @code{FRACTION} --- Fractional part of the model representation
-@cindex @code{FRACTION} intrinsic
-@cindex fractional part
+@fnindex FRACTION
+@cindex real number, fraction
+@cindex floating point, fraction
@table @asis
@item @emph{Description}:
representation of @code{X}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Elemental function
@code{Y = FRACTION(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
+@multitable @columnfractions .15 .70
@item @var{X} @tab The type of the argument shall be a @code{REAL}.
@end multitable
@node FREE
@section @code{FREE} --- Frees memory
-@cindex @code{FREE} intrinsic
-@cindex Cray pointers
+@fnindex FREE
+@cindex pointer, cray
@table @asis
@item @emph{Description}:
Subroutine
@item @emph{Syntax}:
-@code{FREE(PTR)}
+@code{CALL FREE(PTR)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
+@multitable @columnfractions .15 .70
@item @var{PTR} @tab The type shall be @code{INTEGER}. It represents the
location of the memory that should be de-allocated.
@end multitable
-
-@node FSTAT
-@section @code{FSTAT} --- Get file status
-@cindex @code{FSTAT} intrinsic
-@cindex file system operations
+@node FSEEK
+@section @code{FSEEK} --- Low level file positioning subroutine
+@fnindex FSEEK
+@cindex file operation, seek
+@cindex file operation, position
@table @asis
@item @emph{Description}:
-@code{FSTAT} is identical to @ref{STAT}, except that information about an
-already opened file is obtained.
+Moves @var{UNIT} to the specified @var{OFFSET}. If @var{WHENCE}
+is set to 0, the @var{OFFSET} is taken as an absolute value @code{SEEK_SET},
+if set to 1, @var{OFFSET} is taken to be relative to the current position
+@code{SEEK_CUR}, and if set to 2 relative to the end of the file @code{SEEK_END}.
+On error, @var{STATUS} is set to a nonzero value. If @var{STATUS} the seek
+fails silently.
+
+This intrinsic routine is not fully backwards compatible with @command{g77}.
+In @command{g77}, the @code{FSEEK} takes a statement label instead of a
+@var{STATUS} variable. If FSEEK is used in old code, change
+@smallexample
+ CALL FSEEK(UNIT, OFFSET, WHENCE, *label)
+@end smallexample
+to
+@smallexample
+ INTEGER :: status
+ CALL FSEEK(UNIT, OFFSET, WHENCE, status)
+ IF (status /= 0) GOTO label
+@end smallexample
-The elements in @code{BUFF} are the same as described by @ref{STAT}.
+Please note that GNU Fortran provides the Fortran 2003 Stream facility.
+Programmers should consider the use of new stream IO feature in new code
+for future portability. See also @ref{Fortran 2003 status}.
@item @emph{Standard}:
GNU extension
@item @emph{Class}:
-Non-elemental subroutine
+Subroutine
@item @emph{Syntax}:
-@code{CALL fstat(UNIT,BUFF[,STATUS])}
+@code{CALL FSEEK(UNIT, OFFSET, WHENCE[, STATUS])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{UNIT} @tab An open I/O unit number of type @code{INTEGER}.
-@item @var{BUFF} @tab The type shall be @code{INTEGER(4), DIMENSION(13)}.
-@item @var{STATUS} @tab (Optional) status flag of type @code{INTEGER(4)}. Returns 0
- on success and a system specific error code otherwise.
+@multitable @columnfractions .15 .70
+@item @var{UNIT} @tab Shall be a scalar of type @code{INTEGER}.
+@item @var{OFFSET} @tab Shall be a scalar of type @code{INTEGER}.
+@item @var{WHENCE} @tab Shall be a scalar of type @code{INTEGER}.
+Its value shall be either 0, 1 or 2.
+@item @var{STATUS} @tab (Optional) shall be a scalar of type
+@code{INTEGER(4)}.
@end multitable
@item @emph{Example}:
-See @ref{STAT} for an example.
+@smallexample
+PROGRAM test_fseek
+ INTEGER, PARAMETER :: SEEK_SET = 0, SEEK_CUR = 1, SEEK_END = 2
+ INTEGER :: fd, offset, ierr
+
+ ierr = 0
+ offset = 5
+ fd = 10
+
+ OPEN(UNIT=fd, FILE="fseek.test")
+ CALL FSEEK(fd, offset, SEEK_SET, ierr) ! move to OFFSET
+ print *, FTELL(fd), ierr
+
+ CALL FSEEK(fd, 0, SEEK_END, ierr) ! move to end
+ print *, FTELL(fd), ierr
+
+ CALL FSEEK(fd, 0, SEEK_SET, ierr) ! move to beginning
+ print *, FTELL(fd), ierr
+
+ CLOSE(UNIT=fd)
+END PROGRAM
+@end smallexample
@item @emph{See also}:
-To stat a link: @ref{LSTAT}, to stat a file: @ref{STAT}
+@ref{FTELL}
@end table
-@node FSEEK
-@section @code{FSEEK} --- Low level file positioning subroutine
-@cindex @code{FSEEK} intrinsic
-@cindex file system operations
-
-Not yet implemented in GNU Fortran.
+@node FSTAT
+@section @code{FSTAT} --- Get file status
+@fnindex FSTAT
+@cindex file system, file status
@table @asis
@item @emph{Description}:
+@code{FSTAT} is identical to @ref{STAT}, except that information about an
+already opened file is obtained.
+
+The elements in @code{VALUES} are the same as described by @ref{STAT}.
+
+This intrinsic is provided in both subroutine and function forms; however,
+only one form can be used in any given program unit.
@item @emph{Standard}:
GNU extension
@item @emph{Class}:
-Subroutine
+Subroutine, function
@item @emph{Syntax}:
+@code{CALL FSTAT(UNIT, VALUES [, STATUS])}
+
@item @emph{Arguments}:
-@item @emph{Return value}:
+@multitable @columnfractions .15 .70
+@item @var{UNIT} @tab An open I/O unit number of type @code{INTEGER}.
+@item @var{VALUES} @tab The type shall be @code{INTEGER(4), DIMENSION(13)}.
+@item @var{STATUS} @tab (Optional) status flag of type @code{INTEGER(4)}. Returns 0
+on success and a system specific error code otherwise.
+@end multitable
+
@item @emph{Example}:
-@item @emph{Specific names}:
-@item @emph{See also}:
-@uref{http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19292, g77 features lacking in gfortran}
+See @ref{STAT} for an example.
+@item @emph{See also}:
+To stat a link: @ref{LSTAT}, to stat a file: @ref{STAT}
@end table
@node FTELL
@section @code{FTELL} --- Current stream position
-@cindex @code{FTELL} intrinsic
+@fnindex FTELL
+@cindex file operation, position
@table @asis
@item @emph{Description}:
@end multitable
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
+@multitable @columnfractions .15 .70
@item @var{OFFSET} @tab Shall of type @code{INTEGER}.
@item @var{UNIT} @tab Shall of type @code{INTEGER}.
@end multitable
-@node GETARG
-@section @code{GETARG} --- Get command line arguments
-@cindex @code{GETARG} intrinsic
-@cindex command-line arguments, to program
+@node GAMMA
+@section @code{GAMMA} --- Gamma function
+@fnindex GAMMA
+@fnindex DGAMMA
+@cindex Gamma function
+@cindex Factorial function
@table @asis
@item @emph{Description}:
-Retrieve the @var{N}th argument that was passed on the
-command line when the containing program was invoked.
+@code{GAMMA(X)} computes Gamma (@math{\Gamma}) of @var{X}. For positive,
+integer values of @var{X} the Gamma function simplifies to the factorial
+function @math{\Gamma(x)=(x-1)!}.
-This intrinsic routine is provided for backwards compatibility with
-GNU Fortran 77. In new code, programmers should consider the use of
-the @ref{GET_COMMAND_ARGUMENT} intrinsic defined by the Fortran 2003
-standard.
+@tex
+$$
+\Gamma(x) = \int_0^\infty t^{x-1}{\rm e}^{-t}\,{\rm d}t
+$$
+@end tex
@item @emph{Standard}:
-GNU extension
+Fortran 2008 and later
@item @emph{Class}:
-Subroutine
+Elemental function
@item @emph{Syntax}:
-@code{CALL GETARG(N,ARG)}
+@code{X = GAMMA(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{N} @tab Shall of type @code{INTEGER(4)}, @math{@var{N} \geq 0}
-@item @var{ARG} @tab Shall be of type @code{CHARACTER(*)}.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab Shall be of type @code{REAL} and neither zero
+nor a negative integer.
@end multitable
@item @emph{Return value}:
-After @code{GETARG} returns, the @var{ARG} argument holds the @var{N}th
-command line argument. If @var{ARG} can not hold the argument, it is
-truncated to fit the length of @var{ARG}. If there are less than @var{N}
-arguments specified at the command line, @var{ARG} will be filled with blanks.
-If @math{@var{N} = 0}, @var{ARG} is set to the name of the program (on systems
-that support this feature).
+The return value is of type @code{REAL} of the same kind as @var{X}.
@item @emph{Example}:
@smallexample
-PROGRAM test_getarg
- INTEGER :: i
- CHARACTER(len=32) :: arg
-
- DO i = 1, iargc()
- CALL getarg(i, arg)
- WRITE (*,*) arg
- END DO
-END PROGRAM
+program test_gamma
+ real :: x = 1.0
+ x = gamma(x) ! returns 1.0
+end program test_gamma
+@end smallexample
+
+@item @emph{Specific names}:
+@multitable @columnfractions .20 .20 .20 .25
+@item Name @tab Argument @tab Return type @tab Standard
+@item @code{GAMMA(X)} @tab @code{REAL(4) X} @tab @code{REAL(4)} @tab GNU Extension
+@item @code{DGAMMA(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab GNU Extension
+@end multitable
+
+@item @emph{See also}:
+Logarithm of the Gamma function: @ref{LOG_GAMMA}
+
+@end table
+
+
+
+@node GERROR
+@section @code{GERROR} --- Get last system error message
+@fnindex GERROR
+@cindex system, error handling
+
+@table @asis
+@item @emph{Description}:
+Returns the system error message corresponding to the last system error.
+This resembles the functionality of @code{strerror(3)} in C.
+
+@item @emph{Standard}:
+GNU extension
+
+@item @emph{Class}:
+Subroutine
+
+@item @emph{Syntax}:
+@code{CALL GERROR(RESULT)}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{RESULT} @tab Shall of type @code{CHARACTER} and of default
+@end multitable
+
+@item @emph{Example}:
+@smallexample
+PROGRAM test_gerror
+ CHARACTER(len=100) :: msg
+ CALL gerror(msg)
+ WRITE(*,*) msg
+END PROGRAM
+@end smallexample
+
+@item @emph{See also}:
+@ref{IERRNO}, @ref{PERROR}
+@end table
+
+
+
+@node GETARG
+@section @code{GETARG} --- Get command line arguments
+@fnindex GETARG
+@cindex command-line arguments
+@cindex arguments, to program
+
+@table @asis
+@item @emph{Description}:
+Retrieve the @var{POS}-th argument that was passed on the
+command line when the containing program was invoked.
+
+This intrinsic routine is provided for backwards compatibility with
+GNU Fortran 77. In new code, programmers should consider the use of
+the @ref{GET_COMMAND_ARGUMENT} intrinsic defined by the Fortran 2003
+standard.
+
+@item @emph{Standard}:
+GNU extension
+
+@item @emph{Class}:
+Subroutine
+
+@item @emph{Syntax}:
+@code{CALL GETARG(POS, VALUE)}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{POS} @tab Shall be of type @code{INTEGER} and not wider than
+the default integer kind; @math{@var{POS} \geq 0}
+@item @var{VALUE} @tab Shall be of type @code{CHARACTER} and of default
+kind.
+@item @var{VALUE} @tab Shall be of type @code{CHARACTER}.
+@end multitable
+
+@item @emph{Return value}:
+After @code{GETARG} returns, the @var{VALUE} argument holds the
+@var{POS}th command line argument. If @var{VALUE} can not hold the
+argument, it is truncated to fit the length of @var{VALUE}. If there are
+less than @var{POS} arguments specified at the command line, @var{VALUE}
+will be filled with blanks. If @math{@var{POS} = 0}, @var{VALUE} is set
+to the name of the program (on systems that support this feature).
+
+@item @emph{Example}:
+@smallexample
+PROGRAM test_getarg
+ INTEGER :: i
+ CHARACTER(len=32) :: arg
+
+ DO i = 1, iargc()
+ CALL getarg(i, arg)
+ WRITE (*,*) arg
+ END DO
+END PROGRAM
@end smallexample
@item @emph{See also}:
GNU Fortran 77 compatibility function: @ref{IARGC}
-F2003 functions and subroutines: @ref{GET_COMMAND}, @ref{GET_COMMAND_ARGUMENT}, @ref{COMMAND_ARGUMENT_COUNT}
+Fortran 2003 functions and subroutines: @ref{GET_COMMAND},
+@ref{GET_COMMAND_ARGUMENT}, @ref{COMMAND_ARGUMENT_COUNT}
@end table
@node GET_COMMAND
@section @code{GET_COMMAND} --- Get the entire command line
-@cindex @code{GET_COMMAND} intrinsic
-@cindex command-line arguments, to program
+@fnindex GET_COMMAND
+@cindex command-line arguments
+@cindex arguments, to program
@table @asis
@item @emph{Description}:
Retrieve the entire command line that was used to invoke the program.
@item @emph{Standard}:
-F2003
+Fortran 2003 and later
@item @emph{Class}:
Subroutine
@item @emph{Syntax}:
-@code{CALL GET_COMMAND(CMD)}
+@code{CALL GET_COMMAND([COMMAND, LENGTH, STATUS])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{CMD} @tab Shall be of type @code{CHARACTER(*)}.
+@multitable @columnfractions .15 .70
+@item @var{COMMAND} @tab (Optional) shall be of type @code{CHARACTER} and
+of default kind.
+@item @var{LENGTH} @tab (Optional) Shall be of type @code{INTEGER} and of
+default kind.
+@item @var{STATUS} @tab (Optional) Shall be of type @code{INTEGER} and of
+default kind.
@end multitable
@item @emph{Return value}:
-Stores the entire command line that was used to invoke the program in @var{ARG}.
-If @var{ARG} is not large enough, the command will be truncated.
+If @var{COMMAND} is present, stores the entire command line that was used
+to invoke the program in @var{COMMAND}. If @var{LENGTH} is present, it is
+assigned the length of the command line. If @var{STATUS} is present, it
+is assigned 0 upon success of the command, -1 if @var{COMMAND} is too
+short to store the command line, or a positive value in case of an error.
@item @emph{Example}:
@smallexample
@node GET_COMMAND_ARGUMENT
@section @code{GET_COMMAND_ARGUMENT} --- Get command line arguments
-@cindex @code{GET_COMMAND_ARGUMENT} intrinsic
-@cindex command-line arguments, to program
+@fnindex GET_COMMAND_ARGUMENT
+@cindex command-line arguments
+@cindex arguments, to program
@table @asis
@item @emph{Description}:
-Retrieve the @var{N}th argument that was passed on the
+Retrieve the @var{NUMBER}-th argument that was passed on the
command line when the containing program was invoked.
@item @emph{Standard}:
-F2003
+Fortran 2003 and later
@item @emph{Class}:
Subroutine
@item @emph{Syntax}:
-@code{CALL GET_COMMAND_ARGUMENT(N,ARG)}
+@code{CALL GET_COMMAND_ARGUMENT(NUMBER [, VALUE, LENGTH, STATUS])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{N} @tab Shall of type @code{INTEGER(4)}, @math{@var{N} \geq 0}
-@item @var{ARG} @tab Shall be of type @code{CHARACTER(*)}.
+@multitable @columnfractions .15 .70
+@item @var{NUMBER} @tab Shall be a scalar of type @code{INTEGER} and of
+default kind, @math{@var{NUMBER} \geq 0}
+@item @var{VALUE} @tab Shall be a scalar of type @code{CHARACTER}
+and of default kind.
+@item @var{LENGTH} @tab (Option) Shall be a scalar of type @code{INTEGER}
+and of default kind.
+@item @var{STATUS} @tab (Option) Shall be a scalar of type @code{INTEGER}
+and of default kind.
@end multitable
@item @emph{Return value}:
-After @code{GET_COMMAND_ARGUMENT} returns, the @var{ARG} argument holds the
-@var{N}th command line argument. If @var{ARG} can not hold the argument, it is
-truncated to fit the length of @var{ARG}. If there are less than @var{N}
-arguments specified at the command line, @var{ARG} will be filled with blanks.
-If @math{@var{N} = 0}, @var{ARG} is set to the name of the program (on systems
-that support this feature).
+After @code{GET_COMMAND_ARGUMENT} returns, the @var{VALUE} argument holds the
+@var{NUMBER}-th command line argument. If @var{VALUE} can not hold the argument, it is
+truncated to fit the length of @var{VALUE}. If there are less than @var{NUMBER}
+arguments specified at the command line, @var{VALUE} will be filled with blanks.
+If @math{@var{NUMBER} = 0}, @var{VALUE} is set to the name of the program (on
+systems that support this feature). The @var{LENGTH} argument contains the
+length of the @var{NUMBER}-th command line argument. If the argument retrieval
+fails, @var{STATUS} is a positive number; if @var{VALUE} contains a truncated
+command line argument, @var{STATUS} is -1; and otherwise the @var{STATUS} is
+zero.
@item @emph{Example}:
@smallexample
@node GETCWD
@section @code{GETCWD} --- Get current working directory
-@cindex @code{GETCWD} intrinsic
-@cindex file system operations
+@fnindex GETCWD
+@cindex system, working directory
@table @asis
@item @emph{Description}:
Get current working directory.
+This intrinsic is provided in both subroutine and function forms; however,
+only one form can be used in any given program unit.
+
@item @emph{Standard}:
GNU extension
@item @emph{Class}:
-Non-elemental subroutine.
+Subroutine, function
@item @emph{Syntax}:
-@code{CALL GETCWD(CWD[,STATUS])}
+@code{CALL GETCWD(C [, STATUS])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{CWD} @tab The type shall be @code{CHARACTER(*)}.
+@multitable @columnfractions .15 .70
+@item @var{C} @tab The type shall be @code{CHARACTER} and of default kind.
@item @var{STATUS} @tab (Optional) status flag. Returns 0 on success,
- a system specific and non-zero error code otherwise.
+a system specific and nonzero error code otherwise.
@end multitable
@item @emph{Example}:
@node GETENV
@section @code{GETENV} --- Get an environmental variable
-@cindex @code{GETENV} intrinsic
+@fnindex GETENV
@cindex environment variable
@table @asis
@item @emph{Description}:
-Get the @var{VALUE} of the environmental variable @var{ENVVAR}.
+Get the @var{VALUE} of the environmental variable @var{NAME}.
This intrinsic routine is provided for backwards compatibility with
GNU Fortran 77. In new code, programmers should consider the use of
Subroutine
@item @emph{Syntax}:
-@code{CALL GETENV(ENVVAR,VALUE)}
+@code{CALL GETENV(NAME, VALUE)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{ENVVAR} @tab Shall be of type @code{CHARACTER(*)}.
-@item @var{VALUE} @tab Shall be of type @code{CHARACTER(*)}.
+@multitable @columnfractions .15 .70
+@item @var{NAME} @tab Shall be of type @code{CHARACTER} and of default kind.
+@item @var{VALUE} @tab Shall be of type @code{CHARACTER} and of default kind.
@end multitable
@item @emph{Return value}:
-Stores the value of @var{ENVVAR} in @var{VALUE}. If @var{VALUE} is
-not large enough to hold the data, it is truncated. If @var{ENVVAR}
+Stores the value of @var{NAME} in @var{VALUE}. If @var{VALUE} is
+not large enough to hold the data, it is truncated. If @var{NAME}
is not set, @var{VALUE} will be filled with blanks.
@item @emph{Example}:
@node GET_ENVIRONMENT_VARIABLE
@section @code{GET_ENVIRONMENT_VARIABLE} --- Get an environmental variable
-@cindex @code{GET_ENVIRONMENT_VARIABLE} intrinsic
+@fnindex GET_ENVIRONMENT_VARIABLE
@cindex environment variable
@table @asis
@item @emph{Description}:
-Get the @var{VALUE} of the environmental variable @var{ENVVAR}.
+Get the @var{VALUE} of the environmental variable @var{NAME}.
@item @emph{Standard}:
-F2003
+Fortran 2003 and later
@item @emph{Class}:
Subroutine
@item @emph{Syntax}:
-@code{CALL GET_ENVIRONMENT_VARIABLE(ENVVAR,VALUE)}
+@code{CALL GET_ENVIRONMENT_VARIABLE(NAME[, VALUE, LENGTH, STATUS, TRIM_NAME)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{ENVVAR} @tab Shall be of type @code{CHARACTER(*)}.
-@item @var{VALUE} @tab Shall be of type @code{CHARACTER(*)}.
+@multitable @columnfractions .15 .70
+@item @var{NAME} @tab Shall be a scalar of type @code{CHARACTER}
+and of default kind.
+@item @var{VALUE} @tab Shall be a scalar of type @code{CHARACTER}
+and of default kind.
+@item @var{LENGTH} @tab Shall be a scalar of type @code{INTEGER}
+and of default kind.
+@item @var{STATUS} @tab Shall be a scalar of type @code{INTEGER}
+and of default kind.
+@item @var{TRIM_NAME} @tab Shall be a scalar of type @code{LOGICAL}
+and of default kind.
@end multitable
@item @emph{Return value}:
-Stores the value of @var{ENVVAR} in @var{VALUE}. If @var{VALUE} is
-not large enough to hold the data, it is truncated. If @var{ENVVAR}
-is not set, @var{VALUE} will be filled with blanks.
+Stores the value of @var{NAME} in @var{VALUE}. If @var{VALUE} is
+not large enough to hold the data, it is truncated. If @var{NAME}
+is not set, @var{VALUE} will be filled with blanks. Argument @var{LENGTH}
+contains the length needed for storing the environment variable @var{NAME}
+or zero if it is not present. @var{STATUS} is -1 if @var{VALUE} is present
+but too short for the environment variable; it is 1 if the environment
+variable does not exist and 2 if the processor does not support environment
+variables; in all other cases @var{STATUS} is zero. If @var{TRIM_NAME} is
+present with the value @code{.FALSE.}, the trailing blanks in @var{NAME}
+are significant; otherwise they are not part of the environment variable
+name.
@item @emph{Example}:
@smallexample
@node GETGID
@section @code{GETGID} --- Group ID function
-@cindex @code{GETGID} intrinsic
-@cindex file system operations
+@fnindex GETGID
+@cindex system, group id
@table @asis
@item @emph{Description}:
GNU extension
@item @emph{Class}:
-function
+Function
@item @emph{Syntax}:
-@code{I = GETGID()}
+@code{RESULT = GETGID()}
@item @emph{Return value}:
The return value of @code{GETGID} is an @code{INTEGER} of the default
@node GETLOG
@section @code{GETLOG} --- Get login name
-@cindex @code{GETLOG} intrinsic
+@fnindex GETLOG
+@cindex system, login name
+@cindex login name
@table @asis
@item @emph{Description}:
Subroutine
@item @emph{Syntax}:
-@code{CALL GETLOG(LOGIN)}
+@code{CALL GETLOG(C)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{LOGIN} @tab Shall be of type @code{CHARACTER(*)}.
+@multitable @columnfractions .15 .70
+@item @var{C} @tab Shall be of type @code{CHARACTER} and of default kind.
@end multitable
@item @emph{Return value}:
-Stores the current user name in @var{LOGIN}. (On systems where
-the @code{getlogin(3)} function is not implemented, this will
+Stores the current user name in @var{LOGIN}. (On systems where POSIX
+functions @code{geteuid} and @code{getpwuid} are not available, and
+the @code{getlogin} function is not implemented either, this will
return a blank string.)
@item @emph{Example}:
@node GETPID
@section @code{GETPID} --- Process ID function
-@cindex @code{GETPID} intrinsic
-@cindex process ID, current
+@fnindex GETPID
+@cindex system, process id
+@cindex process id
@table @asis
@item @emph{Description}:
GNU extension
@item @emph{Class}:
-function
+Function
@item @emph{Syntax}:
-@code{I = GETPID()}
+@code{RESULT = GETPID()}
@item @emph{Return value}:
The return value of @code{GETPID} is an @code{INTEGER} of the default
@node GETUID
@section @code{GETUID} --- User ID function
-@cindex @code{GETUID} intrinsic
-@cindex user ID, current
+@fnindex GETUID
+@cindex system, user id
+@cindex user id
@table @asis
@item @emph{Description}:
GNU extension
@item @emph{Class}:
-function
+Function
@item @emph{Syntax}:
-@code{GETUID()}
+@code{RESULT = GETUID()}
@item @emph{Return value}:
The return value of @code{GETUID} is an @code{INTEGER} of the default
@node GMTIME
@section @code{GMTIME} --- Convert time to GMT info
-@cindex @code{GMTIME} intrinsic
-@cindex time, conversion function
-
-Not yet implemented in GNU Fortran.
+@fnindex GMTIME
+@cindex time, conversion to GMT info
@table @asis
@item @emph{Description}:
+Given a system time value @var{TIME} (as provided by the @code{TIME8()}
+intrinsic), fills @var{VALUES} with values extracted from it appropriate
+to the UTC time zone (Universal Coordinated Time, also known in some
+countries as GMT, Greenwich Mean Time), using @code{gmtime(3)}.
@item @emph{Standard}:
GNU extension
Subroutine
@item @emph{Syntax}:
+@code{CALL GMTIME(TIME, VALUES)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{TIME} @tab An @code{INTEGER} scalar expression
+corresponding to a system time, with @code{INTENT(IN)}.
+@item @var{VALUES} @tab A default @code{INTEGER} array with 9 elements,
+with @code{INTENT(OUT)}.
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
-@item @emph{Specific names}:
+The elements of @var{VALUES} are assigned as follows:
+@enumerate
+@item Seconds after the minute, range 0--59 or 0--61 to allow for leap
+seconds
+@item Minutes after the hour, range 0--59
+@item Hours past midnight, range 0--23
+@item Day of month, range 0--31
+@item Number of months since January, range 0--12
+@item Years since 1900
+@item Number of days since Sunday, range 0--6
+@item Days since January 1
+@item Daylight savings indicator: positive if daylight savings is in
+effect, zero if not, and negative if the information is not available.
+@end enumerate
+
@item @emph{See also}:
+@ref{CTIME}, @ref{LTIME}, @ref{TIME}, @ref{TIME8}
@end table
@node HOSTNM
@section @code{HOSTNM} --- Get system host name
-@cindex @code{HOSTNM} intrinsic
+@fnindex HOSTNM
+@cindex system, host name
@table @asis
@item @emph{Description}:
@item @emph{Syntax}:
@multitable @columnfractions .80
-@item @code{CALL HOSTNM(NAME, STATUS)}
+@item @code{CALL HOSTNM(C [, STATUS])}
@item @code{STATUS = HOSTNM(NAME)}
@end multitable
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{NAME} @tab Shall of type @code{CHARACTER(*)}.
+@multitable @columnfractions .15 .70
+@item @var{C} @tab Shall of type @code{CHARACTER} and of default kind.
@item @var{STATUS} @tab (Optional) status flag of type @code{INTEGER}.
- Returns 0 on success, or a system specific error
- code otherwise.
+Returns 0 on success, or a system specific error code otherwise.
@end multitable
@item @emph{Return value}:
@node HUGE
@section @code{HUGE} --- Largest number of a kind
-@cindex @code{HUGE} intrinsic
-@cindex huge
+@fnindex HUGE
+@cindex limits, largest number
+@cindex model representation, largest number
@table @asis
@item @emph{Description}:
the model of the type of @code{X}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
-Elemental function
+Inquiry function
@item @emph{Syntax}:
-@code{Y = HUGE(X)}
+@code{RESULT = HUGE(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab shall be of type @code{REAL} or @code{INTEGER}.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab Shall be of type @code{REAL} or @code{INTEGER}.
@end multitable
@item @emph{Return value}:
+@node HYPOT
+@section @code{HYPOT} --- Euclidean distance function
+@fnindex HYPOT
+@cindex Euclidean distance
+
+@table @asis
+@item @emph{Description}:
+@code{HYPOT(X,Y)} is the Euclidean distance function. It is equal to
+@math{\sqrt{X^2 + Y^2}}, without undue underflow or overflow.
+
+@item @emph{Standard}:
+Fortran 2008 and later
+
+@item @emph{Class}:
+Elemental function
+
+@item @emph{Syntax}:
+@code{RESULT = HYPOT(X, Y)}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be @code{REAL}.
+@item @var{Y} @tab The type and kind type parameter shall be the same as
+@var{X}.
+@end multitable
+
+@item @emph{Return value}:
+The return value has the same type and kind type parameter as @var{X}.
+
+@item @emph{Example}:
+@smallexample
+program test_hypot
+ real(4) :: x = 1.e0_4, y = 0.5e0_4
+ x = hypot(x,y)
+end program test_hypot
+@end smallexample
+@end table
+
+
+
@node IACHAR
@section @code{IACHAR} --- Code in @acronym{ASCII} collating sequence
-@cindex @code{IACHAR} intrinsic
+@fnindex IACHAR
@cindex @acronym{ASCII} collating sequence
-@cindex conversion function (character)
+@cindex collating sequence, @acronym{ASCII}
+@cindex conversion, to integer
@table @asis
@item @emph{Description}:
in the first character position of @code{C}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later, with @var{KIND} argument Fortran 2003 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{I = IACHAR(C)}
+@code{RESULT = IACHAR(C [, KIND])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{C} @tab Shall be a scalar @code{CHARACTER}, with @code{INTENT(IN)}
+@multitable @columnfractions .15 .70
+@item @var{C} @tab Shall be a scalar @code{CHARACTER}, with @code{INTENT(IN)}
+@item @var{KIND} @tab (Optional) An @code{INTEGER} initialization
+expression indicating the kind parameter of the result.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{INTEGER} and of the default integer
-kind.
+The return value is of type @code{INTEGER} and of kind @var{KIND}. If
+@var{KIND} is absent, the return value is of default integer kind.
@item @emph{Example}:
@smallexample
end program test_iachar
@end smallexample
+@item @emph{Note}:
+See @ref{ICHAR} for a discussion of converting between numerical values
+and formatted string representations.
+
@item @emph{See also}:
-@ref{CHAR},@ref{ICHAR}
+@ref{ACHAR}, @ref{CHAR}, @ref{ICHAR}
@end table
+
@node IAND
@section @code{IAND} --- Bitwise logical and
-@cindex @code{IAND} intrinsic
-@cindex bit operations
+@fnindex IAND
+@cindex bitwise logical and
+@cindex logical and, bitwise
@table @asis
@item @emph{Description}:
Bitwise logical @code{AND}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{RESULT = IAND(X, Y)}
+@code{RESULT = IAND(I, J)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{INTEGER(*)}.
-@item @var{Y} @tab The type shall be @code{INTEGER(*)}.
+@multitable @columnfractions .15 .70
+@item @var{I} @tab The type shall be @code{INTEGER}.
+@item @var{J} @tab The type shall be @code{INTEGER}, of the same
+kind as @var{I}. (As a GNU extension, different kinds are also
+permitted.)
@end multitable
@item @emph{Return value}:
-The return type is @code{INTEGER(*)} after cross-promotion of the arguments.
+The return type is @code{INTEGER}, of the same kind as the
+arguments. (If the argument kinds differ, it is of the same kind as
+the larger argument.)
@item @emph{Example}:
@smallexample
@end smallexample
@item @emph{See also}:
-@ref{IOR}, @ref{IEOR}, @ref{IBITS}, @ref{IBSET}, @ref{IBCLR},
+@ref{IOR}, @ref{IEOR}, @ref{IBITS}, @ref{IBSET}, @ref{IBCLR}, @ref{NOT}
+
@end table
@node IARGC
@section @code{IARGC} --- Get the number of command line arguments
-@cindex @code{IARGC} intrinsic
-@cindex command-line arguments, to program
+@fnindex IARGC
+@cindex command-line arguments
+@cindex command-line arguments, number of
+@cindex arguments, to program
@table @asis
@item @emph{Description}:
GNU extension
@item @emph{Class}:
-Non-elemental Function
+Function
@item @emph{Syntax}:
-@code{I = IARGC()}
+@code{RESULT = IARGC()}
@item @emph{Arguments}:
None.
@item @emph{See also}:
GNU Fortran 77 compatibility subroutine: @ref{GETARG}
-F2003 functions and subroutines: @ref{GET_COMMAND}, @ref{GET_COMMAND_ARGUMENT}, @ref{COMMAND_ARGUMENT_COUNT}
+Fortran 2003 functions and subroutines: @ref{GET_COMMAND},
+@ref{GET_COMMAND_ARGUMENT}, @ref{COMMAND_ARGUMENT_COUNT}
@end table
@node IBCLR
@section @code{IBCLR} --- Clear bit
-@cindex @code{IBCLR} intrinsic
-@cindex bit operations
-
-Intrinsic implemented, documentation pending.
+@fnindex IBCLR
+@cindex bits, unset
+@cindex bits, clear
@table @asis
@item @emph{Description}:
+@code{IBCLR} returns the value of @var{I} with the bit at position
+@var{POS} set to zero.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
+@code{RESULT = IBCLR(I, POS)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{I} @tab The type shall be @code{INTEGER}.
+@item @var{POS} @tab The type shall be @code{INTEGER}.
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
-@item @emph{Specific names}:
+The return value is of type @code{INTEGER} and of the same kind as
+@var{I}.
@item @emph{See also}:
-@ref{IBITS}, @ref{IBSET}, @ref{IAND}, @ref{IOR}, @ref{IEOR}
-@end table
+@ref{IBITS}, @ref{IBSET}, @ref{IAND}, @ref{IOR}, @ref{IEOR}, @ref{MVBITS}
+@end table
@node IBITS
@section @code{IBITS} --- Bit extraction
-@cindex @code{IBITS} intrinsic
-@cindex bit operations
-
-Intrinsic implemented, documentation pending.
+@fnindex IBITS
+@cindex bits, get
+@cindex bits, extract
@table @asis
@item @emph{Description}:
+@code{IBITS} extracts a field of length @var{LEN} from @var{I},
+starting from bit position @var{POS} and extending left for @var{LEN}
+bits. The result is right-justified and the remaining bits are
+zeroed. The value of @code{POS+LEN} must be less than or equal to the
+value @code{BIT_SIZE(I)}.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
+@code{RESULT = IBITS(I, POS, LEN)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{I} @tab The type shall be @code{INTEGER}.
+@item @var{POS} @tab The type shall be @code{INTEGER}.
+@item @var{LEN} @tab The type shall be @code{INTEGER}.
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
-@item @emph{Specific names}:
-@item @emph{See also}:
-@ref{IBCLR}, @ref{IBSET}, @ref{IAND}, @ref{IOR}, @ref{IEOR}
+The return value is of type @code{INTEGER} and of the same kind as
+@var{I}.
+@item @emph{See also}:
+@ref{BIT_SIZE}, @ref{IBCLR}, @ref{IBSET}, @ref{IAND}, @ref{IOR}, @ref{IEOR}
@end table
-
@node IBSET
@section @code{IBSET} --- Set bit
-@cindex @code{IBSET} intrinsic
-@cindex bit operations
-
-Intrinsic implemented, documentation pending.
+@fnindex IBSET
+@cindex bits, set
@table @asis
@item @emph{Description}:
+@code{IBSET} returns the value of @var{I} with the bit at position
+@var{POS} set to one.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
+@code{RESULT = IBSET(I, POS)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{I} @tab The type shall be @code{INTEGER}.
+@item @var{POS} @tab The type shall be @code{INTEGER}.
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
-@item @emph{Specific names}:
+The return value is of type @code{INTEGER} and of the same kind as
+@var{I}.
@item @emph{See also}:
-@ref{IBCLR}, @ref{IBITS}, @ref{IAND}, @ref{IOR}, @ref{IEOR}
+@ref{IBCLR}, @ref{IBITS}, @ref{IAND}, @ref{IOR}, @ref{IEOR}, @ref{MVBITS}
@end table
@node ICHAR
@section @code{ICHAR} --- Character-to-integer conversion function
-@cindex @code{ICHAR} intrinsic
-@cindex conversion function (character)
+@fnindex ICHAR
+@cindex conversion, to integer
@table @asis
@item @emph{Description}:
the same across different GNU Fortran implementations.
@item @emph{Standard}:
-F95 and later
+Fortan 95 and later, with @var{KIND} argument Fortran 2003 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{I = ICHAR(C)}
+@code{RESULT = ICHAR(C [, KIND])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{C} @tab Shall be a scalar @code{CHARACTER}, with @code{INTENT(IN)}
+@multitable @columnfractions .15 .70
+@item @var{C} @tab Shall be a scalar @code{CHARACTER}, with @code{INTENT(IN)}
+@item @var{KIND} @tab (Optional) An @code{INTEGER} initialization
+expression indicating the kind parameter of the result.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{INTEGER} and of the default integer
-kind.
+The return value is of type @code{INTEGER} and of kind @var{KIND}. If
+@var{KIND} is absent, the return value is of default integer kind.
@item @emph{Example}:
@smallexample
@end smallexample
@item @emph{Note}:
-No intrinsic exists to convert a printable character string to a numerical
-value. For example, there is no intrinsic that, given the @code{CHARACTER}
-value 154, returns an @code{INTEGER} or @code{REAL} value with the
-value 154.
-
-Instead, you can use internal-file I/O to do this kind of conversion. For
+No intrinsic exists to convert between a numeric value and a formatted
+character string representation -- for instance, given the
+@code{CHARACTER} value @code{'154'}, obtaining an @code{INTEGER} or
+@code{REAL} value with the value 154, or vice versa. Instead, this
+functionality is provided by internal-file I/O, as in the following
example:
@smallexample
program read_val
integer value
- character(len=10) string
-
+ character(len=10) string, string2
string = '154'
+
+ ! Convert a string to a numeric value
read (string,'(I10)') value
print *, value
+
+ ! Convert a value to a formatted string
+ write (string2,'(I10)') value
+ print *, string2
end program read_val
@end smallexample
+
+@item @emph{See also}:
+@ref{ACHAR}, @ref{CHAR}, @ref{IACHAR}
+
@end table
+
+
@node IDATE
@section @code{IDATE} --- Get current local time subroutine (day/month/year)
-@cindex @code{IDATE} intrinsic
+@fnindex IDATE
+@cindex date, current
+@cindex current date
@table @asis
@item @emph{Description}:
-@code{IDATE(TARRAY)} Fills @var{TARRAY} with the numerical values at the
+@code{IDATE(VALUES)} Fills @var{VALUES} with the numerical values at the
current local time. The day (in the range 1-31), month (in the range 1-12),
-and year appear in elements 1, 2, and 3 of @var{TARRAY}, respectively.
+and year appear in elements 1, 2, and 3 of @var{VALUES}, respectively.
The year has four significant digits.
@item @emph{Standard}:
Subroutine
@item @emph{Syntax}:
-@code{CALL IDATE(TARRAY)}
+@code{CALL IDATE(VALUES)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{TARRAY} @tab The type shall be @code{INTEGER, DIMENSION(3)} and
+@multitable @columnfractions .15 .70
+@item @var{VALUES} @tab The type shall be @code{INTEGER, DIMENSION(3)} and
the kind shall be the default integer kind.
@end multitable
@item @emph{Return value}:
-Does not return.
+Does not return anything.
@item @emph{Example}:
@smallexample
@node IEOR
@section @code{IEOR} --- Bitwise logical exclusive or
-@cindex @code{IEOR} intrinsic
-@cindex bit operations
-
-Intrinsic implemented, documentation pending.
+@fnindex IEOR
+@cindex bitwise logical exclusive or
+@cindex logical exclusive or, bitwise
@table @asis
@item @emph{Description}:
+@code{IEOR} returns the bitwise boolean exclusive-OR of @var{I} and
+@var{J}.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
+@code{RESULT = IEOR(I, J)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{I} @tab The type shall be @code{INTEGER}.
+@item @var{J} @tab The type shall be @code{INTEGER}, of the same
+kind as @var{I}. (As a GNU extension, different kinds are also
+permitted.)
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
-@item @emph{Specific names}:
+The return type is @code{INTEGER}, of the same kind as the
+arguments. (If the argument kinds differ, it is of the same kind as
+the larger argument.)
@item @emph{See also}:
-@ref{IOR}, @ref{IAND}, @ref{IBITS}, @ref{IBSET}, @ref{IBCLR},
+@ref{IOR}, @ref{IAND}, @ref{IBITS}, @ref{IBSET}, @ref{IBCLR}, @ref{NOT}
@end table
-
@node IERRNO
@section @code{IERRNO} --- Get the last system error number
-@cindex @code{IERRNO} intrinsic
-@cindex undocumented intrinsic
-
-Intrinsic implemented, documentation pending.
+@fnindex IERRNO
+@cindex system, error handling
@table @asis
@item @emph{Description}:
+Returns the last system error number, as given by the C @code{errno()}
+function.
+
@item @emph{Standard}:
GNU extension
@item @emph{Class}:
+Function
+
@item @emph{Syntax}:
+@code{RESULT = IERRNO()}
+
@item @emph{Arguments}:
+None.
+
@item @emph{Return value}:
-@item @emph{Example}:
+The return value is of type @code{INTEGER} and of the default integer
+kind.
@item @emph{See also}:
@ref{PERROR}
-
-@node INDEX
+@node INDEX intrinsic
@section @code{INDEX} --- Position of a substring within a string
-@cindex @code{INDEX} intrinsic
-@cindex undocumented intrinsic
-
-Intrinsic implemented, documentation pending.
+@fnindex INDEX
+@cindex substring position
+@cindex string, find substring
@table @asis
@item @emph{Description}:
+Returns the position of the start of the first occurrence of string
+@var{SUBSTRING} as a substring in @var{STRING}, counting from one. If
+@var{SUBSTRING} is not present in @var{STRING}, zero is returned. If
+the @var{BACK} argument is present and true, the return value is the
+start of the last occurrence rather than the first.
+
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later, with @var{KIND} argument Fortran 2003 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
+@code{RESULT = INDEX(STRING, SUBSTRING [, BACK [, KIND]])}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{STRING} @tab Shall be a scalar @code{CHARACTER}, with
+@code{INTENT(IN)}
+@item @var{SUBSTRING} @tab Shall be a scalar @code{CHARACTER}, with
+@code{INTENT(IN)}
+@item @var{BACK} @tab (Optional) Shall be a scalar @code{LOGICAL}, with
+@code{INTENT(IN)}
+@item @var{KIND} @tab (Optional) An @code{INTEGER} initialization
+expression indicating the kind parameter of the result.
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
-@item @emph{Specific names}:
+The return value is of type @code{INTEGER} and of kind @var{KIND}. If
+@var{KIND} is absent, the return value is of default integer kind.
+
@item @emph{See also}:
+@ref{SCAN}, @ref{VERIFY}
@end table
-
@node INT
@section @code{INT} --- Convert to integer type
-@cindex @code{INT} intrinsic
-@cindex @code{IFIX} intrinsic
-@cindex @code{IDINT} intrinsic
-@cindex conversion function (integer)
+@fnindex INT
+@fnindex IFIX
+@fnindex IDINT
+@cindex conversion, to integer
@table @asis
@item @emph{Description}:
Convert to integer type
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@multitable @columnfractions .30 .80
-@item @code{X = INT(X)}
-@item @code{X = INT(X, KIND)}
-@end multitable
+@code{RESULT = INT(A [, KIND))}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab shall be of type @code{INTEGER(*)}, @code{REAL(*)} or @code{COMPLEX(*)}
-@item @var{KIND} @tab (Optional) @var{KIND} shall be a scalar integer.
+@multitable @columnfractions .15 .70
+@item @var{A} @tab Shall be of type @code{INTEGER},
+@code{REAL}, or @code{COMPLEX}.
+@item @var{KIND} @tab (Optional) An @code{INTEGER} initialization
+expression indicating the kind parameter of the result.
@end multitable
@item @emph{Return value}:
-These functions return a @code{INTEGER(*)} variable or array under
+These functions return a @code{INTEGER} variable or array under
the following rules:
@table @asis
@item (A)
-If @var{X} is of type @code{INTEGER(*)}, @code{INT(X) = X}
+If @var{A} is of type @code{INTEGER}, @code{INT(A) = A}
@item (B)
-If @var{X} is of type @code{REAL(*)} and @math{|X| < 1} @code{INT(X)} equals @var{0}.
-If @math{|X| \geq 1}, then @code{INT(X)} equals the largest integer that does not exceed
-the range of @var{X} and whose sign is the same as the sign of @var{X}.
+If @var{A} is of type @code{REAL} and @math{|A| < 1}, @code{INT(A)} equals @code{0}.
+If @math{|A| \geq 1}, then @code{INT(A)} equals the largest integer that does not exceed
+the range of @var{A} and whose sign is the same as the sign of @var{A}.
@item (C)
-If @var{X} is of type @code{COMPLEX(*)}, rule B is applied to the real part of X.
+If @var{A} is of type @code{COMPLEX}, rule B is applied to the real part of @var{A}.
@end table
@item @emph{Example}:
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
-@item @code{IFIX(X)} @tab @code{REAL(4) X} @tab @code{INTEGER} @tab F77 and later
-@item @code{IDINT(X)} @tab @code{REAL(8) X} @tab @code{INTEGER} @tab F77 and later
+@item @code{IFIX(A)} @tab @code{REAL(4) A} @tab @code{INTEGER} @tab Fortran 77 and later
+@item @code{IDINT(A)} @tab @code{REAL(8) A} @tab @code{INTEGER} @tab Fortran 77 and later
@end multitable
-@comment @item @emph{See also}:
@end table
-
-@node IOR
-@section @code{IOR} --- Bitwise logical or
-@cindex @code{IOR} intrinsic
-@cindex bit operations
-
-Intrinsic implemented, documentation pending.
+@node INT2
+@section @code{INT2} --- Convert to 16-bit integer type
+@fnindex INT2
+@fnindex SHORT
+@cindex conversion, to integer
@table @asis
@item @emph{Description}:
+Convert to a @code{KIND=2} integer type. This is equivalent to the
+standard @code{INT} intrinsic with an optional argument of
+@code{KIND=2}, and is only included for backwards compatibility.
+
+The @code{SHORT} intrinsic is equivalent to @code{INT2}.
+
@item @emph{Standard}:
-F95 and later
+GNU extension
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
+@code{RESULT = INT2(A)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{A} @tab Shall be of type @code{INTEGER},
+@code{REAL}, or @code{COMPLEX}.
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
-@item @emph{Specific names}:
+The return value is a @code{INTEGER(2)} variable.
@item @emph{See also}:
-@ref{IEOR}, @ref{IAND}, @ref{IBITS}, @ref{IBSET}, @ref{IBCLR},
+@ref{INT}, @ref{INT8}, @ref{LONG}
@end table
-
-@node IRAND
-@section @code{IRAND} --- Integer pseudo-random number
-@cindex @code{IRAND} intrinsic
-@cindex random numbers
+@node INT8
+@section @code{INT8} --- Convert to 64-bit integer type
+@fnindex INT8
+@cindex conversion, to integer
@table @asis
@item @emph{Description}:
-@code{IRAND(FLAG)} returns a pseudo-random number from a uniform
-distribution between 0 and a system-dependent limit (which is in most
-cases 2147483647). If @var{FLAG} is 0, the next number
-in the current sequence is returned; if @var{FLAG} is 1, the generator
-is restarted by @code{CALL SRAND(0)}; if @var{FLAG} has any other value,
-it is used as a new seed with @code{SRAND}.
+Convert to a @code{KIND=8} integer type. This is equivalent to the
+standard @code{INT} intrinsic with an optional argument of
+@code{KIND=8}, and is only included for backwards compatibility.
@item @emph{Standard}:
GNU extension
@item @emph{Class}:
-non-elemental function
+Elemental function
@item @emph{Syntax}:
-@code{I = IRAND(FLAG)}
+@code{RESULT = INT8(A)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{FLAG} @tab shall be a scalar @code{INTEGER} of kind 4.
+@multitable @columnfractions .15 .70
+@item @var{A} @tab Shall be of type @code{INTEGER},
+@code{REAL}, or @code{COMPLEX}.
@end multitable
@item @emph{Return value}:
-The return value is of @code{INTEGER(kind=4)} type.
-
-@item @emph{Example}:
-@smallexample
-program test_irand
- integer,parameter :: seed = 86456
-
- call srand(seed)
- print *, irand(), irand(), irand(), irand()
- print *, irand(seed), irand(), irand(), irand()
-end program test_irand
-@end smallexample
+The return value is a @code{INTEGER(8)} variable.
+@item @emph{See also}:
+@ref{INT}, @ref{INT2}, @ref{LONG}
@end table
-@node ISHFT
-@section @code{ISHFT} --- Shift bits
-@cindex @code{ISHFT} intrinsic
-@cindex bit operations
-
-Intrinsic implemented, documentation pending.
+@node IOR
+@section @code{IOR} --- Bitwise logical or
+@fnindex IOR
+@cindex bitwise logical or
+@cindex logical or, bitwise
@table @asis
@item @emph{Description}:
+@code{IOR} returns the bitwise boolean inclusive-OR of @var{I} and
+@var{J}.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
+@code{RESULT = IOR(I, J)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{I} @tab The type shall be @code{INTEGER}.
+@item @var{J} @tab The type shall be @code{INTEGER}, of the same
+kind as @var{I}. (As a GNU extension, different kinds are also
+permitted.)
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
-@item @emph{Specific names}:
+The return type is @code{INTEGER}, of the same kind as the
+arguments. (If the argument kinds differ, it is of the same kind as
+the larger argument.)
@item @emph{See also}:
-@ref{ISHFTC}
+@ref{IEOR}, @ref{IAND}, @ref{IBITS}, @ref{IBSET}, @ref{IBCLR}, @ref{NOT}
@end table
+@node IRAND
+@section @code{IRAND} --- Integer pseudo-random number
+@fnindex IRAND
+@cindex random number generation
-@node ISHFTC
-@section @code{ISHFTC} --- Shift bits circularly
-@cindex @code{ISHFTC} intrinsic
-@cindex bit operations
+@table @asis
+@item @emph{Description}:
+@code{IRAND(FLAG)} returns a pseudo-random number from a uniform
+distribution between 0 and a system-dependent limit (which is in most
+cases 2147483647). If @var{FLAG} is 0, the next number
+in the current sequence is returned; if @var{FLAG} is 1, the generator
+is restarted by @code{CALL SRAND(0)}; if @var{FLAG} has any other value,
+it is used as a new seed with @code{SRAND}.
+
+This intrinsic routine is provided for backwards compatibility with
+GNU Fortran 77. It implements a simple modulo generator as provided
+by @command{g77}. For new code, one should consider the use of
+@ref{RANDOM_NUMBER} as it implements a superior algorithm.
+
+@item @emph{Standard}:
+GNU extension
-Intrinsic implemented, documentation pending.
+@item @emph{Class}:
+Function
+
+@item @emph{Syntax}:
+@code{RESULT = IRAND(I)}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{I} @tab Shall be a scalar @code{INTEGER} of kind 4.
+@end multitable
+
+@item @emph{Return value}:
+The return value is of @code{INTEGER(kind=4)} type.
+
+@item @emph{Example}:
+@smallexample
+program test_irand
+ integer,parameter :: seed = 86456
+
+ call srand(seed)
+ print *, irand(), irand(), irand(), irand()
+ print *, irand(seed), irand(), irand(), irand()
+end program test_irand
+@end smallexample
+
+@end table
+
+
+
+@node IS_IOSTAT_END
+@section @code{IS_IOSTAT_END} --- Test for end-of-file value
+@fnindex IS_IOSTAT_END
+@cindex IOSTAT, end of file
@table @asis
@item @emph{Description}:
+@code{IS_IOSTAT_END} tests whether an variable has the value of the I/O
+status ``end of file''. The function is equivalent to comparing the variable
+with the @code{IOSTAT_END} parameter of the intrinsic module
+@code{ISO_FORTRAN_ENV}.
+
@item @emph{Standard}:
-F95 and later
+Fortran 2003 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
+@code{RESULT = IS_IOSTAT_END(I)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{I} @tab Shall be of the type @code{INTEGER}.
+@end multitable
+
@item @emph{Return value}:
+Returns a @code{LOGICAL} of the default kind, which @code{.TRUE.} if
+@var{I} has the value which indicates an end of file condition for
+IOSTAT= specifiers, and is @code{.FALSE.} otherwise.
+
@item @emph{Example}:
-@item @emph{Specific names}:
+@smallexample
+PROGRAM iostat
+ IMPLICIT NONE
+ INTEGER :: stat, i
+ OPEN(88, FILE='test.dat')
+ READ(88, *, IOSTAT=stat) i
+ IF(IS_IOSTAT_END(stat)) STOP 'END OF FILE'
+END PROGRAM
+@end smallexample
+@end table
+
+
+
+@node IS_IOSTAT_EOR
+@section @code{IS_IOSTAT_EOR} --- Test for end-of-record value
+@fnindex IS_IOSTAT_EOR
+@cindex IOSTAT, end of record
+
+@table @asis
+@item @emph{Description}:
+@code{IS_IOSTAT_EOR} tests whether an variable has the value of the I/O
+status ``end of record''. The function is equivalent to comparing the
+variable with the @code{IOSTAT_EOR} parameter of the intrinsic module
+@code{ISO_FORTRAN_ENV}.
+
+@item @emph{Standard}:
+Fortran 2003 and later
+
+@item @emph{Class}:
+Elemental function
+
+@item @emph{Syntax}:
+@code{RESULT = IS_IOSTAT_EOR(I)}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{I} @tab Shall be of the type @code{INTEGER}.
+@end multitable
+
+@item @emph{Return value}:
+Returns a @code{LOGICAL} of the default kind, which @code{.TRUE.} if
+@var{I} has the value which indicates an end of file condition for
+IOSTAT= specifiers, and is @code{.FALSE.} otherwise.
+
+@item @emph{Example}:
+@smallexample
+PROGRAM iostat
+ IMPLICIT NONE
+ INTEGER :: stat, i(50)
+ OPEN(88, FILE='test.dat', FORM='UNFORMATTED')
+ READ(88, IOSTAT=stat) i
+ IF(IS_IOSTAT_EOR(stat)) STOP 'END OF RECORD'
+END PROGRAM
+@end smallexample
+@end table
+
+
+
+@node ISATTY
+@section @code{ISATTY} --- Whether a unit is a terminal device.
+@fnindex ISATTY
+@cindex system, terminal
+
+@table @asis
+@item @emph{Description}:
+Determine whether a unit is connected to a terminal device.
+
+@item @emph{Standard}:
+GNU extension
+
+@item @emph{Class}:
+Function
+
+@item @emph{Syntax}:
+@code{RESULT = ISATTY(UNIT)}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{UNIT} @tab Shall be a scalar @code{INTEGER}.
+@end multitable
+
+@item @emph{Return value}:
+Returns @code{.TRUE.} if the @var{UNIT} is connected to a terminal
+device, @code{.FALSE.} otherwise.
+
+@item @emph{Example}:
+@smallexample
+PROGRAM test_isatty
+ INTEGER(kind=1) :: unit
+ DO unit = 1, 10
+ write(*,*) isatty(unit=unit)
+ END DO
+END PROGRAM
+@end smallexample
+@item @emph{See also}:
+@ref{TTYNAM}
+@end table
+
+
+
+@node ISHFT
+@section @code{ISHFT} --- Shift bits
+@fnindex ISHFT
+@cindex bits, shift
+
+@table @asis
+@item @emph{Description}:
+@code{ISHFT} returns a value corresponding to @var{I} with all of the
+bits shifted @var{SHIFT} places. A value of @var{SHIFT} greater than
+zero corresponds to a left shift, a value of zero corresponds to no
+shift, and a value less than zero corresponds to a right shift. If the
+absolute value of @var{SHIFT} is greater than @code{BIT_SIZE(I)}, the
+value is undefined. Bits shifted out from the left end or right end are
+lost; zeros are shifted in from the opposite end.
+
+@item @emph{Standard}:
+Fortran 95 and later
+
+@item @emph{Class}:
+Elemental function
+
+@item @emph{Syntax}:
+@code{RESULT = ISHFT(I, SHIFT)}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{I} @tab The type shall be @code{INTEGER}.
+@item @var{SHIFT} @tab The type shall be @code{INTEGER}.
+@end multitable
+
+@item @emph{Return value}:
+The return value is of type @code{INTEGER} and of the same kind as
+@var{I}.
+
+@item @emph{See also}:
+@ref{ISHFTC}
+@end table
+
+
+
+@node ISHFTC
+@section @code{ISHFTC} --- Shift bits circularly
+@fnindex ISHFTC
+@cindex bits, shift circular
+
+@table @asis
+@item @emph{Description}:
+@code{ISHFTC} returns a value corresponding to @var{I} with the
+rightmost @var{SIZE} bits shifted circularly @var{SHIFT} places; that
+is, bits shifted out one end are shifted into the opposite end. A value
+of @var{SHIFT} greater than zero corresponds to a left shift, a value of
+zero corresponds to no shift, and a value less than zero corresponds to
+a right shift. The absolute value of @var{SHIFT} must be less than
+@var{SIZE}. If the @var{SIZE} argument is omitted, it is taken to be
+equivalent to @code{BIT_SIZE(I)}.
+
+@item @emph{Standard}:
+Fortran 95 and later
+
+@item @emph{Class}:
+Elemental function
+
+@item @emph{Syntax}:
+@code{RESULT = ISHFTC(I, SHIFT [, SIZE])}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{I} @tab The type shall be @code{INTEGER}.
+@item @var{SHIFT} @tab The type shall be @code{INTEGER}.
+@item @var{SIZE} @tab (Optional) The type shall be @code{INTEGER};
+the value must be greater than zero and less than or equal to
+@code{BIT_SIZE(I)}.
+@end multitable
+
+@item @emph{Return value}:
+The return value is of type @code{INTEGER} and of the same kind as
+@var{I}.
@item @emph{See also}:
@ref{ISHFT}
+@node ISNAN
+@section @code{ISNAN} --- Test for a NaN
+@fnindex ISNAN
+@cindex IEEE, ISNAN
+
+@table @asis
+@item @emph{Description}:
+@code{ISNAN} tests whether a floating-point value is an IEEE
+Not-a-Number (NaN).
+@item @emph{Standard}:
+GNU extension
+
+@item @emph{Class}:
+Elemental function
+
+@item @emph{Syntax}:
+@code{ISNAN(X)}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{X} @tab Variable of the type @code{REAL}.
+
+@end multitable
+
+@item @emph{Return value}:
+Returns a default-kind @code{LOGICAL}. The returned value is @code{TRUE}
+if @var{X} is a NaN and @code{FALSE} otherwise.
+
+@item @emph{Example}:
+@smallexample
+program test_nan
+ implicit none
+ real :: x
+ x = -1.0
+ x = sqrt(x)
+ if (isnan(x)) stop '"x" is a NaN'
+end program test_nan
+@end smallexample
+@end table
+
+
+
@node ITIME
@section @code{ITIME} --- Get current local time subroutine (hour/minutes/seconds)
-@cindex @code{ITIME} intrinsic
+@fnindex ITIME
+@cindex time, current
+@cindex current time
@table @asis
@item @emph{Description}:
-@code{IDATE(TARRAY)} Fills @var{TARRAY} with the numerical values at the
+@code{IDATE(VALUES)} Fills @var{VALUES} with the numerical values at the
current local time. The hour (in the range 1-24), minute (in the range 1-60),
-and seconds (in the range 1-60) appear in elements 1, 2, and 3 of @var{TARRAY},
+and seconds (in the range 1-60) appear in elements 1, 2, and 3 of @var{VALUES},
respectively.
@item @emph{Standard}:
Subroutine
@item @emph{Syntax}:
-@code{CALL ITIME(TARRAY)}
+@code{CALL ITIME(VALUES)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{TARRAY} @tab The type shall be @code{INTEGER, DIMENSION(3)}
+@multitable @columnfractions .15 .70
+@item @var{VALUES} @tab The type shall be @code{INTEGER, DIMENSION(3)}
and the kind shall be the default integer kind.
@end multitable
@item @emph{Return value}:
-Does not return.
+Does not return anything.
@item @emph{Example}:
@node KILL
@section @code{KILL} --- Send a signal to a process
-@cindex @code{KILL} intrinsic
-@cindex undocumented intrinsic
-
-Intrinsic implemented, documentation pending.
+@fnindex KILL
@table @asis
@item @emph{Description}:
@item @emph{Standard}:
-GNU extension
+Sends the signal specified by @var{SIGNAL} to the process @var{PID}.
+See @code{kill(2)}.
+
+This intrinsic is provided in both subroutine and function forms; however,
+only one form can be used in any given program unit.
@item @emph{Class}:
-Subroutine
+Subroutine, function
@item @emph{Syntax}:
+@code{CALL KILL(C, VALUE [, STATUS])}
+
@item @emph{Arguments}:
-@item @emph{Return value}:
-@item @emph{Example}:
-@item @emph{Specific names}:
+@multitable @columnfractions .15 .70
+@item @var{C} @tab Shall be a scalar @code{INTEGER}, with
+@code{INTENT(IN)}
+@item @var{VALUE} @tab Shall be a scalar @code{INTEGER}, with
+@code{INTENT(IN)}
+@item @var{STATUS} @tab (Optional) status flag of type @code{INTEGER(4)} or
+@code{INTEGER(8)}. Returns 0 on success, or a system-specific error code
+otherwise.
+@end multitable
@item @emph{See also}:
@ref{ABORT}, @ref{EXIT}
@node KIND
@section @code{KIND} --- Kind of an entity
-@cindex @code{KIND} intrinsic
+@fnindex KIND
+@cindex kind
@table @asis
@item @emph{Description}:
@code{KIND(X)} returns the kind value of the entity @var{X}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Inquiry function
@code{K = KIND(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
+@multitable @columnfractions .15 .70
@item @var{X} @tab Shall be of type @code{LOGICAL}, @code{INTEGER},
@code{REAL}, @code{COMPLEX} or @code{CHARACTER}.
@end multitable
@node LBOUND
@section @code{LBOUND} --- Lower dimension bounds of an array
-@cindex @code{LBOUND} intrinsic
-@cindex undocumented intrinsic
-
-Intrinsic implemented, documentation pending.
+@fnindex LBOUND
+@cindex array, lower bound
@table @asis
@item @emph{Description}:
+Returns the lower bounds of an array, or a single lower bound
+along the @var{DIM} dimension.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later, with @var{KIND} argument Fortran 2003 and later
@item @emph{Class}:
Inquiry function
@item @emph{Syntax}:
+@code{RESULT = LBOUND(ARRAY [, DIM [, KIND]])}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{ARRAY} @tab Shall be an array, of any type.
+@item @var{DIM} @tab (Optional) Shall be a scalar @code{INTEGER}.
+@item @var{KIND} @tab (Optional) An @code{INTEGER} initialization
+expression indicating the kind parameter of the result.
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
+The return value is of type @code{INTEGER} and of kind @var{KIND}. If
+@var{KIND} is absent, the return value is of default integer kind.
+If @var{DIM} is absent, the result is an array of the lower bounds of
+@var{ARRAY}. If @var{DIM} is present, the result is a scalar
+corresponding to the lower bound of the array along that dimension. If
+@var{ARRAY} is an expression rather than a whole array or array
+structure component, or if it has a zero extent along the relevant
+dimension, the lower bound is taken to be 1.
+
@item @emph{See also}:
@ref{UBOUND}
@end table
+@node LEADZ
+@section @code{LEADZ} --- Number of leading zero bits of an integer
+@fnindex LEADZ
+@cindex zero bits
+
+@table @asis
+@item @emph{Description}:
+@code{LEADZ} returns the number of leading zero bits of an integer.
+
+@item @emph{Standard}:
+Fortran 2008 and later
+
+@item @emph{Class}:
+Elemental function
+
+@item @emph{Syntax}:
+@code{RESULT = LEADZ(I)}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{I} @tab Shall be of type @code{INTEGER}.
+@end multitable
+
+@item @emph{Return value}:
+The type of the return value is the default @code{INTEGER}.
+If all the bits of @code{I} are zero, the result value is @code{BIT_SIZE(I)}.
+
+@item @emph{Example}:
+@smallexample
+PROGRAM test_leadz
+ WRITE (*,*) LEADZ(1) ! prints 8 if BITSIZE(I) has the value 32
+END PROGRAM
+@end smallexample
+
+@item @emph{See also}:
+@ref{BIT_SIZE}, @ref{TRAILZ}
+@end table
+
+
@node LEN
@section @code{LEN} --- Length of a character entity
-@cindex @code{LEN} intrinsic
-@cindex undocumented intrinsic
-
-Intrinsic implemented, documentation pending.
+@fnindex LEN
+@cindex string, length
@table @asis
@item @emph{Description}:
+Returns the length of a character string. If @var{STRING} is an array,
+the length of an element of @var{STRING} is returned. Note that
+@var{STRING} need not be defined when this intrinsic is invoked, since
+only the length, not the content, of @var{STRING} is needed.
+
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later, with @var{KIND} argument Fortran 2003 and later
@item @emph{Class}:
Inquiry function
@item @emph{Syntax}:
+@code{L = LEN(STRING [, KIND])}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{STRING} @tab Shall be a scalar or array of type
+@code{CHARACTER}, with @code{INTENT(IN)}
+@item @var{KIND} @tab (Optional) An @code{INTEGER} initialization
+expression indicating the kind parameter of the result.
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
-@item @emph{Specific names}:
+The return value is of type @code{INTEGER} and of kind @var{KIND}. If
+@var{KIND} is absent, the return value is of default integer kind.
@item @emph{See also}:
@ref{LEN_TRIM}, @ref{ADJUSTL}, @ref{ADJUSTR}
-
@node LEN_TRIM
@section @code{LEN_TRIM} --- Length of a character entity without trailing blank characters
-@cindex @code{LEN_TRIM} intrinsic
-@cindex undocumented intrinsic
-
-Intrinsic implemented, documentation pending.
+@fnindex LEN_TRIM
+@cindex string, length, without trailing whitespace
@table @asis
@item @emph{Description}:
+Returns the length of a character string, ignoring any trailing blanks.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later, with @var{KIND} argument Fortran 2003 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
+@code{RESULT = LEN_TRIM(STRING [, KIND])}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{STRING} @tab Shall be a scalar of type @code{CHARACTER},
+with @code{INTENT(IN)}
+@item @var{KIND} @tab (Optional) An @code{INTEGER} initialization
+expression indicating the kind parameter of the result.
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
+The return value is of type @code{INTEGER} and of kind @var{KIND}. If
+@var{KIND} is absent, the return value is of default integer kind.
@item @emph{See also}:
@ref{LEN}, @ref{ADJUSTL}, @ref{ADJUSTR}
-
@node LGE
@section @code{LGE} --- Lexical greater than or equal
-@cindex @code{LGE} intrinsic
-@cindex comparison (lexical)
-
-Intrinsic implemented, documentation pending.
+@fnindex LGE
+@cindex lexical comparison of strings
+@cindex string, comparison
@table @asis
@item @emph{Description}:
+Determines whether one string is lexically greater than or equal to
+another string, where the two strings are interpreted as containing
+ASCII character codes. If the String A and String B are not the same
+length, the shorter is compared as if spaces were appended to it to form
+a value that has the same length as the longer.
+
+In general, the lexical comparison intrinsics @code{LGE}, @code{LGT},
+@code{LLE}, and @code{LLT} differ from the corresponding intrinsic
+operators @code{.GE.}, @code{.GT.}, @code{.LE.}, and @code{.LT.}, in
+that the latter use the processor's character ordering (which is not
+ASCII on some targets), whereas the former always use the ASCII
+ordering.
+
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
+@code{RESULT = LGE(STRING_A, STRING_B)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{STRING_A} @tab Shall be of default @code{CHARACTER} type.
+@item @var{STRING_B} @tab Shall be of default @code{CHARACTER} type.
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
+Returns @code{.TRUE.} if @code{STRING_A >= STRING_B}, and @code{.FALSE.}
+otherwise, based on the ASCII ordering.
@item @emph{See also}:
@ref{LGT}, @ref{LLE}, @ref{LLT}
-
@node LGT
@section @code{LGT} --- Lexical greater than
-@cindex @code{LGT} intrinsic
-@cindex comparison (lexical)
-
-Intrinsic implemented, documentation pending.
+@fnindex LGT
+@cindex lexical comparison of strings
+@cindex string, comparison
@table @asis
@item @emph{Description}:
+Determines whether one string is lexically greater than another string,
+where the two strings are interpreted as containing ASCII character
+codes. If the String A and String B are not the same length, the
+shorter is compared as if spaces were appended to it to form a value
+that has the same length as the longer.
+
+In general, the lexical comparison intrinsics @code{LGE}, @code{LGT},
+@code{LLE}, and @code{LLT} differ from the corresponding intrinsic
+operators @code{.GE.}, @code{.GT.}, @code{.LE.}, and @code{.LT.}, in
+that the latter use the processor's character ordering (which is not
+ASCII on some targets), whereas the former always use the ASCII
+ordering.
+
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
+@code{RESULT = LGT(STRING_A, STRING_B)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{STRING_A} @tab Shall be of default @code{CHARACTER} type.
+@item @var{STRING_B} @tab Shall be of default @code{CHARACTER} type.
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
+Returns @code{.TRUE.} if @code{STRING_A > STRING_B}, and @code{.FALSE.}
+otherwise, based on the ASCII ordering.
@item @emph{See also}:
@ref{LGE}, @ref{LLE}, @ref{LLT}
-
@node LINK
@section @code{LINK} --- Create a hard link
-@cindex @code{LINK} intrinsic
-@cindex file system operations
-
-Intrinsic implemented, documentation pending.
+@fnindex LINK
+@cindex file system, create link
+@cindex file system, hard link
@table @asis
@item @emph{Description}:
+Makes a (hard) link from file @var{PATH1} to @var{PATH2}. A null
+character (@code{CHAR(0)}) can be used to mark the end of the names in
+@var{PATH1} and @var{PATH2}; otherwise, trailing blanks in the file
+names are ignored. If the @var{STATUS} argument is supplied, it
+contains 0 on success or a nonzero error code upon return; see
+@code{link(2)}.
+
+This intrinsic is provided in both subroutine and function forms;
+however, only one form can be used in any given program unit.
+
@item @emph{Standard}:
GNU extension
@item @emph{Class}:
-Subroutine
+Subroutine, function
@item @emph{Syntax}:
+@multitable @columnfractions .80
+@item @code{CALL LINK(PATH1, PATH2 [, STATUS])}
+@item @code{STATUS = LINK(PATH1, PATH2)}
+@end multitable
+
@item @emph{Arguments}:
-@item @emph{Return value}:
-@item @emph{Example}:
-@item @emph{Specific names}:
+@multitable @columnfractions .15 .70
+@item @var{PATH1} @tab Shall be of default @code{CHARACTER} type.
+@item @var{PATH2} @tab Shall be of default @code{CHARACTER} type.
+@item @var{STATUS} @tab (Optional) Shall be of default @code{INTEGER} type.
+@end multitable
@item @emph{See also}:
-@ref{UNLINK}
+@ref{SYMLNK}, @ref{UNLINK}
@end table
-
@node LLE
@section @code{LLE} --- Lexical less than or equal
-@cindex @code{LLE} intrinsic
-@cindex comparison (lexical)
-
-Intrinsic implemented, documentation pending.
+@fnindex LLE
+@cindex lexical comparison of strings
+@cindex string, comparison
@table @asis
@item @emph{Description}:
+Determines whether one string is lexically less than or equal to another
+string, where the two strings are interpreted as containing ASCII
+character codes. If the String A and String B are not the same length,
+the shorter is compared as if spaces were appended to it to form a value
+that has the same length as the longer.
+
+In general, the lexical comparison intrinsics @code{LGE}, @code{LGT},
+@code{LLE}, and @code{LLT} differ from the corresponding intrinsic
+operators @code{.GE.}, @code{.GT.}, @code{.LE.}, and @code{.LT.}, in
+that the latter use the processor's character ordering (which is not
+ASCII on some targets), whereas the former always use the ASCII
+ordering.
+
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
+@code{RESULT = LLE(STRING_A, STRING_B)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{STRING_A} @tab Shall be of default @code{CHARACTER} type.
+@item @var{STRING_B} @tab Shall be of default @code{CHARACTER} type.
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
+Returns @code{.TRUE.} if @code{STRING_A <= STRING_B}, and @code{.FALSE.}
+otherwise, based on the ASCII ordering.
@item @emph{See also}:
@ref{LGE}, @ref{LGT}, @ref{LLT}
-
@node LLT
@section @code{LLT} --- Lexical less than
-@cindex @code{LLT} intrinsic
-@cindex comparison (lexical)
-
-Intrinsic implemented, documentation pending.
+@fnindex LLT
+@cindex lexical comparison of strings
+@cindex string, comparison
@table @asis
@item @emph{Description}:
+Determines whether one string is lexically less than another string,
+where the two strings are interpreted as containing ASCII character
+codes. If the String A and String B are not the same length, the
+shorter is compared as if spaces were appended to it to form a value
+that has the same length as the longer.
+
+In general, the lexical comparison intrinsics @code{LGE}, @code{LGT},
+@code{LLE}, and @code{LLT} differ from the corresponding intrinsic
+operators @code{.GE.}, @code{.GT.}, @code{.LE.}, and @code{.LT.}, in
+that the latter use the processor's character ordering (which is not
+ASCII on some targets), whereas the former always use the ASCII
+ordering.
+
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
+@code{RESULT = LLT(STRING_A, STRING_B)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{STRING_A} @tab Shall be of default @code{CHARACTER} type.
+@item @var{STRING_B} @tab Shall be of default @code{CHARACTER} type.
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
+Returns @code{.TRUE.} if @code{STRING_A < STRING_B}, and @code{.FALSE.}
+otherwise, based on the ASCII ordering.
@item @emph{See also}:
@ref{LGE}, @ref{LGT}, @ref{LLE}
-
@node LNBLNK
@section @code{LNBLNK} --- Index of the last non-blank character in a string
-@cindex @code{LNBLNK} intrinsic
-@cindex undocumented intrinsic
-
-Intrinsic implemented, documentation pending.
+@fnindex LNBLNK
+@cindex string, find non-blank character
@table @asis
@item @emph{Description}:
+Returns the length of a character string, ignoring any trailing blanks.
+This is identical to the standard @code{LEN_TRIM} intrinsic, and is only
+included for backwards compatibility.
+
@item @emph{Standard}:
GNU extension
@item @emph{Class}:
+Elemental function
+
@item @emph{Syntax}:
+@code{RESULT = LNBLNK(STRING)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{STRING} @tab Shall be a scalar of type @code{CHARACTER},
+with @code{INTENT(IN)}
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
-@item @emph{Specific names}:
+The return value is of @code{INTEGER(kind=4)} type.
@item @emph{See also}:
-@ref{INDEX}, @ref{LEN_TRIM}
+@ref{INDEX intrinsic}, @ref{LEN_TRIM}
@end table
-
@node LOC
@section @code{LOC} --- Returns the address of a variable
-@cindex @code{LOC} intrinsic
+@fnindex LOC
@cindex location of a variable in memory
@table @asis
Inquiry function
@item @emph{Syntax}:
-@code{I = LOC(X)}
+@code{RESULT = LOC(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
+@multitable @columnfractions .15 .70
@item @var{X} @tab Variable of any type.
@end multitable
@end smallexample
@end table
+
+
@node LOG
@section @code{LOG} --- Logarithm function
-@cindex @code{LOG} intrinsic
-@cindex @code{ALOG} intrinsic
-@cindex @code{DLOG} intrinsic
-@cindex @code{CLOG} intrinsic
-@cindex @code{ZLOG} intrinsic
-@cindex @code{CDLOG} intrinsic
-@cindex logarithm
+@fnindex LOG
+@fnindex ALOG
+@fnindex DLOG
+@fnindex CLOG
+@fnindex ZLOG
+@fnindex CDLOG
+@cindex exponential function, inverse
+@cindex logarithmic function
@table @asis
@item @emph{Description}:
@code{LOG(X)} computes the logarithm of @var{X}.
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = LOG(X)}
+@code{RESULT = LOG(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)} or
-@code{COMPLEX(*)}.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be @code{REAL} or
+@code{COMPLEX}.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{REAL(*)} or @code{COMPLEX(*)}.
+The return value is of type @code{REAL} or @code{COMPLEX}.
The kind type parameter is the same as @var{X}.
+If @var{X} is @code{COMPLEX}, the imaginary part @math{\omega} is in the range
+@math{-\pi \leq \omega \leq \pi}.
@item @emph{Example}:
@smallexample
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
@item @code{ALOG(X)} @tab @code{REAL(4) X} @tab @code{REAL(4)} @tab f95, gnu
@item @code{DLOG(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab f95, gnu
@node LOG10
@section @code{LOG10} --- Base 10 logarithm function
-@cindex @code{LOG10} intrinsic
-@cindex @code{ALOG10} intrinsic
-@cindex @code{DLOG10} intrinsic
-@cindex logarithm
+@fnindex LOG10
+@fnindex ALOG10
+@fnindex DLOG10
+@cindex exponential function, inverse
+@cindex logarithmic function
@table @asis
@item @emph{Description}:
@code{LOG10(X)} computes the base 10 logarithm of @var{X}.
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = LOG10(X)}
+@code{RESULT = LOG10(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)} or
-@code{COMPLEX(*)}.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be @code{REAL}.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{REAL(*)} or @code{COMPLEX(*)}.
+The return value is of type @code{REAL} or @code{COMPLEX}.
The kind type parameter is the same as @var{X}.
@item @emph{Example}:
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
-@item @code{ALOG10(X)} @tab @code{REAL(4) X} @tab @code{REAL(4)} @tab F95 and later
-@item @code{DLOG10(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab F95 and later
+@item @code{ALOG10(X)} @tab @code{REAL(4) X} @tab @code{REAL(4)} @tab Fortran 95 and later
+@item @code{DLOG10(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab Fortran 95 and later
@end multitable
@end table
-@node LOGICAL
-@section @code{LOGICAL} --- Convert to logical type
-@cindex @code{LOGICAL} intrinsic
-@cindex conversion function (logical)
-Intrinsic implemented, documentation pending.
+@node LOG_GAMMA
+@section @code{LOG_GAMMA} --- Logarithm of the Gamma function
+@fnindex LOG_GAMMA
+@fnindex LGAMMA
+@fnindex ALGAMA
+@fnindex DLGAMA
+@cindex Gamma function, logarithm of
@table @asis
@item @emph{Description}:
+@code{LOG_GAMMA(X)} computes the natural logarithm of the absolute value
+of the Gamma (@math{\Gamma}) function.
+
@item @emph{Standard}:
-F95 and later
+Fortran 2008 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
+@code{X = LOG_GAMMA(X)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{X} @tab Shall be of type @code{REAL} and neither zero
+nor a negative integer.
+@end multitable
+
@item @emph{Return value}:
+The return value is of type @code{REAL} of the same kind as @var{X}.
+
@item @emph{Example}:
+@smallexample
+program test_log_gamma
+ real :: x = 1.0
+ x = lgamma(x) ! returns 0.0
+end program test_log_gamma
+@end smallexample
+
@item @emph{Specific names}:
+@multitable @columnfractions .20 .20 .20 .25
+@item Name @tab Argument @tab Return type @tab Standard
+@item @code{LGAMMA(X)} @tab @code{REAL(4) X} @tab @code{REAL(4)} @tab GNU Extension
+@item @code{ALGAMA(X)} @tab @code{REAL(4) X} @tab @code{REAL(4)} @tab GNU Extension
+@item @code{DLGAMA(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab GNU Extension
+@end multitable
+
+@item @emph{See also}:
+Gamma function: @ref{GAMMA}
+
+@end table
+
+
+
+@node LOGICAL
+@section @code{LOGICAL} --- Convert to logical type
+@fnindex LOGICAL
+@cindex conversion, to logical
+
+@table @asis
+@item @emph{Description}:
+Converts one kind of @code{LOGICAL} variable to another.
+
+@item @emph{Standard}:
+Fortran 95 and later
+
+@item @emph{Class}:
+Elemental function
+
+@item @emph{Syntax}:
+@code{RESULT = LOGICAL(L [, KIND])}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{L} @tab The type shall be @code{LOGICAL}.
+@item @var{KIND} @tab (Optional) An @code{INTEGER} initialization
+expression indicating the kind parameter of the result.
+@end multitable
+
+@item @emph{Return value}:
+The return value is a @code{LOGICAL} value equal to @var{L}, with a
+kind corresponding to @var{KIND}, or of the default logical kind if
+@var{KIND} is not given.
+
@item @emph{See also}:
+@ref{INT}, @ref{REAL}, @ref{CMPLX}
@end table
+@node LONG
+@section @code{LONG} --- Convert to integer type
+@fnindex LONG
+@cindex conversion, to integer
+
+@table @asis
+@item @emph{Description}:
+Convert to a @code{KIND=4} integer type, which is the same size as a C
+@code{long} integer. This is equivalent to the standard @code{INT}
+intrinsic with an optional argument of @code{KIND=4}, and is only
+included for backwards compatibility.
+
+@item @emph{Standard}:
+GNU extension
+
+@item @emph{Class}:
+Elemental function
+
+@item @emph{Syntax}:
+@code{RESULT = LONG(A)}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{A} @tab Shall be of type @code{INTEGER},
+@code{REAL}, or @code{COMPLEX}.
+@end multitable
+
+@item @emph{Return value}:
+The return value is a @code{INTEGER(4)} variable.
+
+@item @emph{See also}:
+@ref{INT}, @ref{INT2}, @ref{INT8}
+@end table
+
+
@node LSHIFT
@section @code{LSHIFT} --- Left shift bits
-@cindex @code{LSHIFT} intrinsic
-@cindex bit operations
-
-Not yet implemented in GNU Fortran.
+@fnindex LSHIFT
+@cindex bits, shift left
@table @asis
@item @emph{Description}:
+@code{LSHIFT} returns a value corresponding to @var{I} with all of the
+bits shifted left by @var{SHIFT} places. If the absolute value of
+@var{SHIFT} is greater than @code{BIT_SIZE(I)}, the value is undefined.
+Bits shifted out from the left end are lost; zeros are shifted in from
+the opposite end.
+
+This function has been superseded by the @code{ISHFT} intrinsic, which
+is standard in Fortran 95 and later.
@item @emph{Standard}:
GNU extension
@item @emph{Class}:
-Function
+Elemental function
@item @emph{Syntax}:
+@code{RESULT = LSHIFT(I, SHIFT)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{I} @tab The type shall be @code{INTEGER}.
+@item @var{SHIFT} @tab The type shall be @code{INTEGER}.
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
-@item @emph{Specific names}:
+The return value is of type @code{INTEGER} and of the same kind as
+@var{I}.
+
@item @emph{See also}:
+@ref{ISHFT}, @ref{ISHFTC}, @ref{RSHIFT}
@end table
+
@node LSTAT
@section @code{LSTAT} --- Get file status
-@cindex @code{LSTAT} intrinsic
-@cindex file system operations
+@fnindex LSTAT
+@cindex file system, file status
@table @asis
@item @emph{Description}:
-@code{LSTAT} is identical to @ref{STAT}, except that if path is a symbolic link,
-then the link itself is statted, not the file that it refers to.
+@code{LSTAT} is identical to @ref{STAT}, except that if path is a
+symbolic link, then the link itself is statted, not the file that it
+refers to.
-The elements in @code{BUFF} are the same as described by @ref{STAT}.
+The elements in @code{VALUES} are the same as described by @ref{STAT}.
+
+This intrinsic is provided in both subroutine and function forms;
+however, only one form can be used in any given program unit.
@item @emph{Standard}:
GNU extension
@item @emph{Class}:
-Non-elemental subroutine
+Subroutine, function
@item @emph{Syntax}:
-@code{CALL LSTAT(FILE,BUFF[,STATUS])}
+@code{CALL LSTAT(NAME, VALUES [, STATUS])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{FILE} @tab The type shall be @code{CHARACTER(*)}, a valid path within the file system.
-@item @var{BUFF} @tab The type shall be @code{INTEGER(4), DIMENSION(13)}.
-@item @var{STATUS} @tab (Optional) status flag of type @code{INTEGER(4)}. Returns 0
- on success and a system specific error code otherwise.
+@multitable @columnfractions .15 .70
+@item @var{NAME} @tab The type shall be @code{CHARACTER} of the default
+kind, a valid path within the file system.
+@item @var{VALUES} @tab The type shall be @code{INTEGER(4), DIMENSION(13)}.
+@item @var{STATUS} @tab (Optional) status flag of type @code{INTEGER(4)}.
+Returns 0 on success and a system specific error code otherwise.
@end multitable
@item @emph{Example}:
@node LTIME
@section @code{LTIME} --- Convert time to local time info
-@cindex @code{LTIME} intrinsic
-@cindex time, conversion function
-
-Not yet implemented in GNU Fortran.
+@fnindex LTIME
+@cindex time, conversion to local time info
@table @asis
@item @emph{Description}:
+Given a system time value @var{TIME} (as provided by the @code{TIME8()}
+intrinsic), fills @var{VALUES} with values extracted from it appropriate
+to the local time zone using @code{localtime(3)}.
@item @emph{Standard}:
GNU extension
Subroutine
@item @emph{Syntax}:
+@code{CALL LTIME(TIME, VALUES)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{TIME} @tab An @code{INTEGER} scalar expression
+corresponding to a system time, with @code{INTENT(IN)}.
+@item @var{VALUES} @tab A default @code{INTEGER} array with 9 elements,
+with @code{INTENT(OUT)}.
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
-@item @emph{Specific names}:
+The elements of @var{VALUES} are assigned as follows:
+@enumerate
+@item Seconds after the minute, range 0--59 or 0--61 to allow for leap
+seconds
+@item Minutes after the hour, range 0--59
+@item Hours past midnight, range 0--23
+@item Day of month, range 0--31
+@item Number of months since January, range 0--12
+@item Years since 1900
+@item Number of days since Sunday, range 0--6
+@item Days since January 1
+@item Daylight savings indicator: positive if daylight savings is in
+effect, zero if not, and negative if the information is not available.
+@end enumerate
+
@item @emph{See also}:
+@ref{CTIME}, @ref{GMTIME}, @ref{TIME}, @ref{TIME8}
@end table
@node MALLOC
@section @code{MALLOC} --- Allocate dynamic memory
-@cindex @code{MALLOC} intrinsic
-@cindex Cray pointers
+@fnindex MALLOC
+@cindex pointer, cray
@table @asis
@item @emph{Description}:
GNU extension
@item @emph{Class}:
-non-elemental function
+Function
@item @emph{Syntax}:
@code{PTR = MALLOC(SIZE)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{SIZE} @tab The type shall be @code{INTEGER(*)}.
+@multitable @columnfractions .15 .70
+@item @var{SIZE} @tab The type shall be @code{INTEGER}.
@end multitable
@item @emph{Return value}:
@item @emph{Example}:
The following example demonstrates the use of @code{MALLOC} and
-@code{FREE} with Cray pointers. This example is intended to run on
-32-bit systems, where the default integer kind is suitable to store
-pointers; on 64-bit systems, ptr_x would need to be declared as
-@code{integer(kind=8)}.
+@code{FREE} with Cray pointers.
@smallexample
program test_malloc
+ implicit none
integer i
- integer ptr_x
real*8 x(*), z
pointer(ptr_x,x)
@end table
+
@node MATMUL
@section @code{MATMUL} --- matrix multiplication
-@cindex @code{MATMUL} intrinsic
-@cindex matrix operations
-
-Intrinsic implemented, documentation pending.
+@fnindex MATMUL
+@cindex matrix multiplication
+@cindex product, matrix
@table @asis
@item @emph{Description}:
+Performs a matrix multiplication on numeric or logical arguments.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Transformational function
@item @emph{Syntax}:
+@code{RESULT = MATMUL(MATRIX_A, MATRIX_B)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{MATRIX_A} @tab An array of @code{INTEGER},
+@code{REAL}, @code{COMPLEX}, or @code{LOGICAL} type, with a rank of
+one or two.
+@item @var{MATRIX_B} @tab An array of @code{INTEGER},
+@code{REAL}, or @code{COMPLEX} type if @var{MATRIX_A} is of a numeric
+type; otherwise, an array of @code{LOGICAL} type. The rank shall be one
+or two, and the first (or only) dimension of @var{MATRIX_B} shall be
+equal to the last (or only) dimension of @var{MATRIX_A}.
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
+The matrix product of @var{MATRIX_A} and @var{MATRIX_B}. The type and
+kind of the result follow the usual type and kind promotion rules, as
+for the @code{*} or @code{.AND.} operators.
+
@item @emph{See also}:
@end table
+
@node MAX
@section @code{MAX} --- Maximum value of an argument list
-@cindex @code{MAX} intrinsic
-@cindex undocumented intrinsic
-
-Intrinsic implemented, documentation pending.
+@fnindex MAX
+@fnindex MAX0
+@fnindex AMAX0
+@fnindex MAX1
+@fnindex AMAX1
+@fnindex DMAX1
+@cindex maximum value
@table @asis
@item @emph{Description}:
+Returns the argument with the largest (most positive) value.
+
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
+@code{RESULT = MAX(A1, A2 [, A3 [, ...]])}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{A1} @tab The type shall be @code{INTEGER} or
+@code{REAL}.
+@item @var{A2}, @var{A3}, ... @tab An expression of the same type and kind
+as @var{A1}. (As a GNU extension, arguments of different kinds are
+permitted.)
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
+The return value corresponds to the maximum value among the arguments,
+and has the same type and kind as the first argument.
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
-@item @code{MAX0(I)} @tab @code{INTEGER(4) I} @tab @code{INTEGER(4)} @tab F77 and later
-@item @code{AMAX0(I)} @tab @code{INTEGER(4) I} @tab @code{REAL(MAX(X))} @tab F77 and later
-@item @code{MAX1(X)} @tab @code{REAL(*) X} @tab @code{INT(MAX(X))} @tab F77 and later
-@item @code{AMAX1(X)} @tab @code{REAL(4) X} @tab @code{REAL(4)} @tab F77 and later
-@item @code{DMAX1(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab F77 and later
+@item @code{MAX0(I)} @tab @code{INTEGER(4) I} @tab @code{INTEGER(4)} @tab Fortran 77 and later
+@item @code{AMAX0(I)} @tab @code{INTEGER(4) I} @tab @code{REAL(MAX(X))} @tab Fortran 77 and later
+@item @code{MAX1(X)} @tab @code{REAL X} @tab @code{INT(MAX(X))} @tab Fortran 77 and later
+@item @code{AMAX1(X)} @tab @code{REAL(4) X} @tab @code{REAL(4)} @tab Fortran 77 and later
+@item @code{DMAX1(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab Fortran 77 and later
@end multitable
@item @emph{See also}:
-@ref{MAXLOC} @ref{MAXVAL}
+@ref{MAXLOC} @ref{MAXVAL}, @ref{MIN}
+
@end table
+
@node MAXEXPONENT
@section @code{MAXEXPONENT} --- Maximum exponent of a real kind
-@cindex @code{MAXEXPONENT} intrinsic
-@cindex maximum exponent
-@cindex exponent, maximum
+@fnindex MAXEXPONENT
+@cindex model representation, maximum exponent
@table @asis
@item @emph{Description}:
type of @code{X}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Inquiry function
@item @emph{Syntax}:
-@code{I = MAXEXPONENT(X)}
+@code{RESULT = MAXEXPONENT(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab shall be of type @code{REAL}.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab Shall be of type @code{REAL}.
@end multitable
@item @emph{Return value}:
@end table
+
@node MAXLOC
@section @code{MAXLOC} --- Location of the maximum value within an array
-@cindex @code{MAXLOC} intrinsic
-@cindex undocumented intrinsic
-
-Intrinsic implemented, documentation pending.
+@fnindex MAXLOC
+@cindex array, location of maximum element
@table @asis
@item @emph{Description}:
+Determines the location of the element in the array with the maximum
+value, or, if the @var{DIM} argument is supplied, determines the
+locations of the maximum element along each row of the array in the
+@var{DIM} direction. If @var{MASK} is present, only the elements for
+which @var{MASK} is @code{.TRUE.} are considered. If more than one
+element in the array has the maximum value, the location returned is
+that of the first such element in array element order. If the array has
+zero size, or all of the elements of @var{MASK} are @code{.FALSE.}, then
+the result is an array of zeroes. Similarly, if @var{DIM} is supplied
+and all of the elements of @var{MASK} along a given row are zero, the
+result value for that row is zero.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Transformational function
@item @emph{Syntax}:
+@multitable @columnfractions .80
+@item @code{RESULT = MAXLOC(ARRAY, DIM [, MASK])}
+@item @code{RESULT = MAXLOC(ARRAY [, MASK])}
+@end multitable
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{ARRAY} @tab Shall be an array of type @code{INTEGER},
+@code{REAL}, or @code{CHARACTER}.
+@item @var{DIM} @tab (Optional) Shall be a scalar of type
+@code{INTEGER}, with a value between one and the rank of @var{ARRAY},
+inclusive. It may not be an optional dummy argument.
+@item @var{MASK} @tab Shall be an array of type @code{LOGICAL},
+and conformable with @var{ARRAY}.
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
+If @var{DIM} is absent, the result is a rank-one array with a length
+equal to the rank of @var{ARRAY}. If @var{DIM} is present, the result
+is an array with a rank one less than the rank of @var{ARRAY}, and a
+size corresponding to the size of @var{ARRAY} with the @var{DIM}
+dimension removed. If @var{DIM} is present and @var{ARRAY} has a rank
+of one, the result is a scalar. In all cases, the result is of default
+@code{INTEGER} type.
+
@item @emph{See also}:
@ref{MAX}, @ref{MAXVAL}
+
@end table
@node MAXVAL
@section @code{MAXVAL} --- Maximum value of an array
-@cindex @code{MAXVAL} intrinsic
-@cindex undocumented intrinsic
-
-Intrinsic implemented, documentation pending.
+@fnindex MAXVAL
+@cindex array, maximum value
+@cindex maximum value
@table @asis
@item @emph{Description}:
-@item @emph{Standard}:
+Determines the maximum value of the elements in an array value, or, if
+the @var{DIM} argument is supplied, determines the maximum value along
+each row of the array in the @var{DIM} direction. If @var{MASK} is
+present, only the elements for which @var{MASK} is @code{.TRUE.} are
+considered. If the array has zero size, or all of the elements of
+@var{MASK} are @code{.FALSE.}, then the result is @code{-HUGE(ARRAY)}
+if @var{ARRAY} is numeric, or a string of nulls if @var{ARRAY} is of character
+type.
+@item @emph{Standard}:
+Fortran 95 and later
@item @emph{Class}:
Transformational function
@item @emph{Syntax}:
+@multitable @columnfractions .80
+@item @code{RESULT = MAXVAL(ARRAY, DIM [, MASK])}
+@item @code{RESULT = MAXVAL(ARRAY [, MASK])}
+@end multitable
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{ARRAY} @tab Shall be an array of type @code{INTEGER},
+@code{REAL}, or @code{CHARACTER}.
+@item @var{DIM} @tab (Optional) Shall be a scalar of type
+@code{INTEGER}, with a value between one and the rank of @var{ARRAY},
+inclusive. It may not be an optional dummy argument.
+@item @var{MASK} @tab Shall be an array of type @code{LOGICAL},
+and conformable with @var{ARRAY}.
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
-@item @emph{Specific names}:
+If @var{DIM} is absent, or if @var{ARRAY} has a rank of one, the result
+is a scalar. If @var{DIM} is present, the result is an array with a
+rank one less than the rank of @var{ARRAY}, and a size corresponding to
+the size of @var{ARRAY} with the @var{DIM} dimension removed. In all
+cases, the result is of the same type and kind as @var{ARRAY}.
@item @emph{See also}:
@ref{MAX}, @ref{MAXLOC}
+@node MCLOCK
+@section @code{MCLOCK} --- Time function
+@fnindex MCLOCK
+@cindex time, clock ticks
+@cindex clock ticks
+
+@table @asis
+@item @emph{Description}:
+Returns the number of clock ticks since the start of the process, based
+on the UNIX function @code{clock(3)}.
+
+This intrinsic is not fully portable, such as to systems with 32-bit
+@code{INTEGER} types but supporting times wider than 32 bits. Therefore,
+the values returned by this intrinsic might be, or become, negative, or
+numerically less than previous values, during a single run of the
+compiled program.
+
+@item @emph{Standard}:
+GNU extension
+
+@item @emph{Class}:
+Function
+
+@item @emph{Syntax}:
+@code{RESULT = MCLOCK()}
+
+@item @emph{Return value}:
+The return value is a scalar of type @code{INTEGER(4)}, equal to the
+number of clock ticks since the start of the process, or @code{-1} if
+the system does not support @code{clock(3)}.
+
+@item @emph{See also}:
+@ref{CTIME}, @ref{GMTIME}, @ref{LTIME}, @ref{MCLOCK}, @ref{TIME}
+
+@end table
-@node MERGE
-@section @code{MERGE} --- Merge arrays
-@cindex @code{MERGE} intrinsic
-@cindex undocumented intrinsic
-Intrinsic implemented, documentation pending.
+
+@node MCLOCK8
+@section @code{MCLOCK8} --- Time function (64-bit)
+@fnindex MCLOCK8
+@cindex time, clock ticks
+@cindex clock ticks
@table @asis
@item @emph{Description}:
+Returns the number of clock ticks since the start of the process, based
+on the UNIX function @code{clock(3)}.
+
+@emph{Warning:} this intrinsic does not increase the range of the timing
+values over that returned by @code{clock(3)}. On a system with a 32-bit
+@code{clock(3)}, @code{MCLOCK8()} will return a 32-bit value, even though
+it is converted to a 64-bit @code{INTEGER(8)} value. That means
+overflows of the 32-bit value can still occur. Therefore, the values
+returned by this intrinsic might be or become negative or numerically
+less than previous values during a single run of the compiled program.
+
@item @emph{Standard}:
-F95 and later
+GNU extension
@item @emph{Class}:
-elemental function
+Function
@item @emph{Syntax}:
-@item @emph{Arguments}:
+@code{RESULT = MCLOCK8()}
+
@item @emph{Return value}:
-@item @emph{Example}:
-@item @emph{Specific names}:
+The return value is a scalar of type @code{INTEGER(8)}, equal to the
+number of clock ticks since the start of the process, or @code{-1} if
+the system does not support @code{clock(3)}.
+
@item @emph{See also}:
+@ref{CTIME}, @ref{GMTIME}, @ref{LTIME}, @ref{MCLOCK}, @ref{TIME8}
+
+@end table
+
+
+
+@node MERGE
+@section @code{MERGE} --- Merge variables
+@fnindex MERGE
+@cindex array, merge arrays
+@cindex array, combine arrays
+
+@table @asis
+@item @emph{Description}:
+Select values from two arrays according to a logical mask. The result
+is equal to @var{TSOURCE} if @var{MASK} is @code{.TRUE.}, or equal to
+@var{FSOURCE} if it is @code{.FALSE.}.
+
+@item @emph{Standard}:
+Fortran 95 and later
+
+@item @emph{Class}:
+Elemental function
+
+@item @emph{Syntax}:
+@code{RESULT = MERGE(TSOURCE, FSOURCE, MASK)}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{TSOURCE} @tab May be of any type.
+@item @var{FSOURCE} @tab Shall be of the same type and type parameters
+as @var{TSOURCE}.
+@item @var{MASK} @tab Shall be of type @code{LOGICAL}.
+@end multitable
+
+@item @emph{Return value}:
+The result is of the same type and type parameters as @var{TSOURCE}.
+
@end table
+
@node MIN
@section @code{MIN} --- Minimum value of an argument list
-@cindex @code{MIN} intrinsic
-@cindex undocumented intrinsic
-
-Intrinsic implemented, documentation pending.
+@fnindex MIN
+@fnindex MIN0
+@fnindex AMIN0
+@fnindex MIN1
+@fnindex AMIN1
+@fnindex DMIN1
+@cindex minimum value
@table @asis
@item @emph{Description}:
+Returns the argument with the smallest (most negative) value.
+
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
+@code{RESULT = MIN(A1, A2 [, A3, ...])}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{A1} @tab The type shall be @code{INTEGER} or
+@code{REAL}.
+@item @var{A2}, @var{A3}, ... @tab An expression of the same type and kind
+as @var{A1}. (As a GNU extension, arguments of different kinds are
+permitted.)
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
+The return value corresponds to the maximum value among the arguments,
+and has the same type and kind as the first argument.
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
-@item @code{MIN0(I)} @tab @code{INTEGER(4) I} @tab @code{INTEGER(4)} @tab F77 and later
-@item @code{AMIN0(I)} @tab @code{INTEGER(4) I} @tab @code{REAL(MIN(X))} @tab F77 and later
-@item @code{MIN1(X)} @tab @code{REAL(*) X} @tab @code{INT(MIN(X))} @tab F77 and later
-@item @code{AMIN1(X)} @tab @code{REAL(4) X} @tab @code{REAL(4)} @tab F77 and later
-@item @code{DMIN1(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab F77 and later
+@item @code{MIN0(I)} @tab @code{INTEGER(4) I} @tab @code{INTEGER(4)} @tab Fortran 77 and later
+@item @code{AMIN0(I)} @tab @code{INTEGER(4) I} @tab @code{REAL(MIN(X))} @tab Fortran 77 and later
+@item @code{MIN1(X)} @tab @code{REAL X} @tab @code{INT(MIN(X))} @tab Fortran 77 and later
+@item @code{AMIN1(X)} @tab @code{REAL(4) X} @tab @code{REAL(4)} @tab Fortran 77 and later
+@item @code{DMIN1(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab Fortran 77 and later
@end multitable
@item @emph{See also}:
-@ref{MINLOC}, @ref{MINVAL}
+@ref{MAX}, @ref{MINLOC}, @ref{MINVAL}
@end table
+
+
@node MINEXPONENT
@section @code{MINEXPONENT} --- Minimum exponent of a real kind
-@cindex @code{MINEXPONENT} intrinsic
-@cindex minimum exponent
-@cindex exponent, minimum
+@fnindex MINEXPONENT
+@cindex model representation, minimum exponent
@table @asis
@item @emph{Description}:
type of @code{X}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Inquiry function
@item @emph{Syntax}:
-@code{I = MINEXPONENT(X)}
+@code{RESULT = MINEXPONENT(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab shall be of type @code{REAL}.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab Shall be of type @code{REAL}.
@end multitable
@item @emph{Return value}:
@end table
+
@node MINLOC
@section @code{MINLOC} --- Location of the minimum value within an array
-@cindex @code{MINLOC} intrinsic
-@cindex undocumented intrinsic
-
-Intrinsic implemented, documentation pending.
+@fnindex MINLOC
+@cindex array, location of minimum element
@table @asis
@item @emph{Description}:
+Determines the location of the element in the array with the minimum
+value, or, if the @var{DIM} argument is supplied, determines the
+locations of the minimum element along each row of the array in the
+@var{DIM} direction. If @var{MASK} is present, only the elements for
+which @var{MASK} is @code{.TRUE.} are considered. If more than one
+element in the array has the minimum value, the location returned is
+that of the first such element in array element order. If the array has
+zero size, or all of the elements of @var{MASK} are @code{.FALSE.}, then
+the result is an array of zeroes. Similarly, if @var{DIM} is supplied
+and all of the elements of @var{MASK} along a given row are zero, the
+result value for that row is zero.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Transformational function
@item @emph{Syntax}:
+@multitable @columnfractions .80
+@item @code{RESULT = MINLOC(ARRAY, DIM [, MASK])}
+@item @code{RESULT = MINLOC(ARRAY [, MASK])}
+@end multitable
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{ARRAY} @tab Shall be an array of type @code{INTEGER},
+@code{REAL}, or @code{CHARACTER}.
+@item @var{DIM} @tab (Optional) Shall be a scalar of type
+@code{INTEGER}, with a value between one and the rank of @var{ARRAY},
+inclusive. It may not be an optional dummy argument.
+@item @var{MASK} @tab Shall be an array of type @code{LOGICAL},
+and conformable with @var{ARRAY}.
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
+If @var{DIM} is absent, the result is a rank-one array with a length
+equal to the rank of @var{ARRAY}. If @var{DIM} is present, the result
+is an array with a rank one less than the rank of @var{ARRAY}, and a
+size corresponding to the size of @var{ARRAY} with the @var{DIM}
+dimension removed. If @var{DIM} is present and @var{ARRAY} has a rank
+of one, the result is a scalar. In all cases, the result is of default
+@code{INTEGER} type.
@item @emph{See also}:
@ref{MIN}, @ref{MINVAL}
@end table
+
@node MINVAL
@section @code{MINVAL} --- Minimum value of an array
-@cindex @code{MINVAL} intrinsic
-@cindex undocumented intrinsic
-
-Intrinsic implemented, documentation pending.
+@fnindex MINVAL
+@cindex array, minimum value
+@cindex minimum value
@table @asis
@item @emph{Description}:
+Determines the minimum value of the elements in an array value, or, if
+the @var{DIM} argument is supplied, determines the minimum value along
+each row of the array in the @var{DIM} direction. If @var{MASK} is
+present, only the elements for which @var{MASK} is @code{.TRUE.} are
+considered. If the array has zero size, or all of the elements of
+@var{MASK} are @code{.FALSE.}, then the result is @code{HUGE(ARRAY)} if
+@var{ARRAY} is numeric, or a string of @code{CHAR(255)} characters if
+@var{ARRAY} is of character type.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Transformational function
@item @emph{Syntax}:
+@multitable @columnfractions .80
+@item @code{RESULT = MINVAL(ARRAY, DIM [, MASK])}
+@item @code{RESULT = MINVAL(ARRAY [, MASK])}
+@end multitable
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{ARRAY} @tab Shall be an array of type @code{INTEGER},
+@code{REAL}, or @code{CHARACTER}.
+@item @var{DIM} @tab (Optional) Shall be a scalar of type
+@code{INTEGER}, with a value between one and the rank of @var{ARRAY},
+inclusive. It may not be an optional dummy argument.
+@item @var{MASK} @tab Shall be an array of type @code{LOGICAL},
+and conformable with @var{ARRAY}.
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
+If @var{DIM} is absent, or if @var{ARRAY} has a rank of one, the result
+is a scalar. If @var{DIM} is present, the result is an array with a
+rank one less than the rank of @var{ARRAY}, and a size corresponding to
+the size of @var{ARRAY} with the @var{DIM} dimension removed. In all
+cases, the result is of the same type and kind as @var{ARRAY}.
@item @emph{See also}:
@ref{MIN}, @ref{MINLOC}
-@end table
+@end table
@node MOD
@section @code{MOD} --- Remainder function
-@cindex @code{MOD} intrinsic
-@cindex @code{AMOD} intrinsic
-@cindex @code{DMOD} intrinsic
+@fnindex MOD
+@fnindex AMOD
+@fnindex DMOD
@cindex remainder
+@cindex division, remainder
@table @asis
@item @emph{Description}:
-@code{MOD(A,P)} computes the remainder of the division of A by P. It is
+@code{MOD(A,P)} computes the remainder of the division of A by P@. It is
calculated as @code{A - (INT(A/P) * P)}.
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = MOD(A,P)}
+@code{RESULT = MOD(A, P)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{A} @tab shall be a scalar of type @code{INTEGER} or @code{REAL}
-@item @var{P} @tab shall be a scalar of the same type as @var{A} and not
+@multitable @columnfractions .15 .70
+@item @var{A} @tab Shall be a scalar of type @code{INTEGER} or @code{REAL}
+@item @var{P} @tab Shall be a scalar of the same type as @var{A} and not
equal to zero
@end multitable
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Arguments @tab Return type @tab Standard
-@item @code{AMOD(A,P)} @tab @code{REAL(4)} @tab @code{REAL(4)} @tab F95 and later
-@item @code{DMOD(A,P)} @tab @code{REAL(8)} @tab @code{REAL(8)} @tab F95 and later
+@item @code{AMOD(A,P)} @tab @code{REAL(4)} @tab @code{REAL(4)} @tab Fortran 95 and later
+@item @code{DMOD(A,P)} @tab @code{REAL(8)} @tab @code{REAL(8)} @tab Fortran 95 and later
@end multitable
@end table
@node MODULO
@section @code{MODULO} --- Modulo function
-@cindex @code{MODULO} intrinsic
+@fnindex MODULO
@cindex modulo
+@cindex division, modulo
@table @asis
@item @emph{Description}:
@code{MODULO(A,P)} computes the @var{A} modulo @var{P}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = MODULO(A,P)}
+@code{RESULT = MODULO(A, P)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{A} @tab shall be a scalar of type @code{INTEGER} or @code{REAL}
-@item @var{P} @tab shall be a scalar of the same type and kind as @var{A}
+@multitable @columnfractions .15 .70
+@item @var{A} @tab Shall be a scalar of type @code{INTEGER} or @code{REAL}
+@item @var{P} @tab Shall be a scalar of the same type and kind as @var{A}
@end multitable
@item @emph{Return value}:
print *, modulo(-17,3)
print *, modulo(-17.5,5.5)
- print *, modulo(17,-3)
- print *, modulo(17.5,-5.5)
-end program test_mod
-@end smallexample
-
-@end table
-
-
-
-@node MVBITS
-@section @code{MVBITS} --- Move bits from one integer to another
-@cindex @code{MVBITS} intrinsic
-@cindex bit operations
-
-Intrinsic implemented, documentation pending.
-
-@table @asis
-@item @emph{Description}:
-@item @emph{Standard}:
-F95 and later
-
-@item @emph{Class}:
-Elemental subroutine
-
-@item @emph{Syntax}:
-@item @emph{Arguments}:
-@item @emph{Return value}:
-@item @emph{Example}:
-@item @emph{See also}:
-@end table
+ print *, modulo(17,-3)
+ print *, modulo(17.5,-5.5)
+end program
+@end smallexample
+@end table
@node MOVE_ALLOC
@section @code{MOVE_ALLOC} --- Move allocation from one object to another
-@cindex @code{MOVE_ALLOC} intrinsic
+@fnindex MOVE_ALLOC
@cindex moving allocation
@cindex allocation, moving
@table @asis
@item @emph{Description}:
-@code{MOVE_ALLOC(SRC, DEST)} moves the allocation from @var{SRC} to
-@var{DEST}. @var{SRC} will become deallocated in the process.
+@code{MOVE_ALLOC(FROM, TO)} moves the allocation from @var{FROM} to
+@var{TO}. @var{FROM} will become deallocated in the process.
@item @emph{Standard}:
-F2003 and later
+Fortran 2003 and later
@item @emph{Class}:
Subroutine
@item @emph{Syntax}:
-@code{CALL MOVE_ALLOC(SRC, DEST)}
+@code{CALL MOVE_ALLOC(FROM, TO)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{SRC} @tab @code{ALLOCATABLE}, @code{INTENT(INOUT)}, may be of any type and kind.
-@item @var{DEST} @tab @code{ALLOCATABLE}, @code{INTENT(OUT)}, shall be of the same type, kind and rank as @var{SRC}
+@multitable @columnfractions .15 .70
+@item @var{FROM} @tab @code{ALLOCATABLE}, @code{INTENT(INOUT)}, may be
+of any type and kind.
+@item @var{TO} @tab @code{ALLOCATABLE}, @code{INTENT(OUT)}, shall be
+of the same type, kind and rank as @var{FROM}.
@end multitable
@item @emph{Return value}:
+@node MVBITS
+@section @code{MVBITS} --- Move bits from one integer to another
+@fnindex MVBITS
+@cindex bits, move
+
+@table @asis
+@item @emph{Description}:
+Moves @var{LEN} bits from positions @var{FROMPOS} through
+@code{FROMPOS+LEN-1} of @var{FROM} to positions @var{TOPOS} through
+@code{TOPOS+LEN-1} of @var{TO}. The portion of argument @var{TO} not
+affected by the movement of bits is unchanged. The values of
+@code{FROMPOS+LEN-1} and @code{TOPOS+LEN-1} must be less than
+@code{BIT_SIZE(FROM)}.
+
+@item @emph{Standard}:
+Fortran 95 and later
+
+@item @emph{Class}:
+Elemental subroutine
+
+@item @emph{Syntax}:
+@code{CALL MVBITS(FROM, FROMPOS, LEN, TO, TOPOS)}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{FROM} @tab The type shall be @code{INTEGER}.
+@item @var{FROMPOS} @tab The type shall be @code{INTEGER}.
+@item @var{LEN} @tab The type shall be @code{INTEGER}.
+@item @var{TO} @tab The type shall be @code{INTEGER}, of the
+same kind as @var{FROM}.
+@item @var{TOPOS} @tab The type shall be @code{INTEGER}.
+@end multitable
+
+@item @emph{See also}:
+@ref{IBCLR}, @ref{IBSET}, @ref{IBITS}, @ref{IAND}, @ref{IOR}, @ref{IEOR}
+@end table
+
+
+
@node NEAREST
@section @code{NEAREST} --- Nearest representable number
-@cindex @code{NEAREST} intrinsic
-@cindex processor-representable number
+@fnindex NEAREST
+@cindex real number, nearest different
+@cindex floating point, nearest different
@table @asis
@item @emph{Description}:
to @code{X} in the direction indicated by the sign of @code{S}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{Y = NEAREST(X, S)}
+@code{RESULT = NEAREST(X, S)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab shall be of type @code{REAL}.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab Shall be of type @code{REAL}.
@item @var{S} @tab (Optional) shall be of type @code{REAL} and
not equal to zero.
@end multitable
@node NEW_LINE
@section @code{NEW_LINE} --- New line character
-@cindex @code{NEW_LINE} intrinsic
-@cindex @code{NEW_LINE} intrinsic
+@fnindex NEW_LINE
+@cindex newline
+@cindex output, newline
@table @asis
@item @emph{Description}:
-@code{NEW_LINE(C)} returns the new-line character
+@code{NEW_LINE(C)} returns the new-line character.
@item @emph{Standard}:
-F2003 and later
+Fortran 2003 and later
@item @emph{Class}:
-Elemental function
+Inquiry function
@item @emph{Syntax}:
-@code{C = NEW_LINE(C)}
+@code{RESULT = NEW_LINE(C)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
+@multitable @columnfractions .15 .70
@item @var{C} @tab The argument shall be a scalar or array of the
- type @code{CHARACTER}.
+type @code{CHARACTER}.
@end multitable
@item @emph{Return value}:
@node NINT
@section @code{NINT} --- Nearest whole number
-@cindex @code{NINT} intrinsic
-@cindex @code{IDNINT} intrinsic
-@cindex whole number
+@fnindex NINT
+@fnindex IDNINT
+@cindex rounding, nearest whole number
@table @asis
@item @emph{Description}:
-@code{NINT(X)} rounds its argument to the nearest whole number.
+@code{NINT(A)} rounds its argument to the nearest whole number.
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later, with @var{KIND} argument Fortran 90 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = NINT(X)}
+@code{RESULT = NINT(A [, KIND])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type of the argument shall be @code{REAL}.
+@multitable @columnfractions .15 .70
+@item @var{A} @tab The type of the argument shall be @code{REAL}.
+@item @var{KIND} @tab (Optional) An @code{INTEGER} initialization
+expression indicating the kind parameter of the result.
@end multitable
@item @emph{Return value}:
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .33 .33 .33
+@multitable @columnfractions .25 .25 .25
@item Name @tab Argument @tab Standard
-@item @code{IDNINT(X)} @tab @code{REAL(8)} @tab F95 and later
+@item @code{IDNINT(X)} @tab @code{REAL(8)} @tab Fortran 95 and later
@end multitable
@item @emph{See also}:
@end table
+
@node NOT
@section @code{NOT} --- Logical negation
-@cindex @code{NOT} intrinsic
-@cindex logical operations
-
-Intrinsic implemented, documentation pending.
+@fnindex NOT
+@cindex bits, negate
+@cindex bitwise logical not
+@cindex logical not, bitwise
@table @asis
@item @emph{Description}:
+@code{NOT} returns the bitwise boolean inverse of @var{I}.
+
@item @emph{Standard}:
-F77 and later
+Fortran 95 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
+@code{RESULT = NOT(I)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{I} @tab The type shall be @code{INTEGER}.
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
+The return type is @code{INTEGER}, of the same kind as the
+argument.
+
@item @emph{See also}:
-@end table
+@ref{IAND}, @ref{IEOR}, @ref{IOR}, @ref{IBITS}, @ref{IBSET}, @ref{IBCLR}
+@end table
@node NULL
@section @code{NULL} --- Function that returns an disassociated pointer
-@cindex @code{NULL} intrinsic
-@cindex undocumented intrinsic
-
-Intrinsic implemented, documentation pending.
+@fnindex NULL
+@cindex pointer, status
+@cindex pointer, disassociated
@table @asis
@item @emph{Description}:
+Returns a disassociated pointer.
+
+If @var{MOLD} is present, a dissassociated pointer of the same type is
+returned, otherwise the type is determined by context.
+
+In Fortran 95, @var{MOLD} is optional. Please note that Fortran 2003
+includes cases where it is required.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Transformational function
@item @emph{Syntax}:
+@code{PTR => NULL([MOLD])}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{MOLD} @tab (Optional) shall be a pointer of any association
+status and of any type.
+@end multitable
+
@item @emph{Return value}:
+A disassociated pointer.
+
@item @emph{Example}:
+@smallexample
+REAL, POINTER, DIMENSION(:) :: VEC => NULL ()
+@end smallexample
+
@item @emph{See also}:
@ref{ASSOCIATED}
@end table
-
@node OR
@section @code{OR} --- Bitwise logical OR
-@cindex @code{OR} intrinsic
-@cindex bit operations
+@fnindex OR
+@cindex bitwise logical or
+@cindex logical or, bitwise
@table @asis
@item @emph{Description}:
GNU extension
@item @emph{Class}:
-Non-elemental function
+Function
@item @emph{Syntax}:
-@code{RESULT = OR(X, Y)}
+@code{RESULT = OR(I, J)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be either @code{INTEGER(*)} or @code{LOGICAL}.
-@item @var{Y} @tab The type shall be either @code{INTEGER(*)} or @code{LOGICAL}.
+@multitable @columnfractions .15 .70
+@item @var{I} @tab The type shall be either a scalar @code{INTEGER}
+type or a scalar @code{LOGICAL} type.
+@item @var{J} @tab The type shall be the same as the type of @var{J}.
@end multitable
@item @emph{Return value}:
-The return type is either @code{INTEGER(*)} or @code{LOGICAL}
-after cross-promotion of the arguments.
+The return type is either a scalar @code{INTEGER} or a scalar
+@code{LOGICAL}. If the kind type parameters differ, then the
+smaller kind type is implicitly converted to larger kind, and the
+return has the larger kind.
@item @emph{Example}:
@smallexample
PROGRAM test_or
- LOGICAL :: T = .TRUE., F = ..FALSE.
+ LOGICAL :: T = .TRUE., F = .FALSE.
INTEGER :: a, b
DATA a / Z'F' /, b / Z'3' /
@end smallexample
@item @emph{See also}:
-F95 elemental function: @ref{IOR}
+Fortran 95 elemental function: @ref{IOR}
@end table
-
@node PACK
@section @code{PACK} --- Pack an array into an array of rank one
-@cindex @code{PACK} intrinsic
-@cindex undocumented intrinsic
-
-Intrinsic implemented, documentation pending.
+@fnindex PACK
+@cindex array, packing
+@cindex array, reduce dimension
+@cindex array, gather elements
@table @asis
@item @emph{Description}:
+Stores the elements of @var{ARRAY} in an array of rank one.
+
+The beginning of the resulting array is made up of elements whose @var{MASK}
+equals @code{TRUE}. Afterwards, positions are filled with elements taken from
+@var{VECTOR}.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Transformational function
@item @emph{Syntax}:
+@code{RESULT = PACK(ARRAY, MASK[,VECTOR]}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{ARRAY} @tab Shall be an array of any type.
+@item @var{MASK} @tab Shall be an array of type @code{LOGICAL} and
+of the same size as @var{ARRAY}. Alternatively, it may be a @code{LOGICAL}
+scalar.
+@item @var{VECTOR} @tab (Optional) shall be an array of the same type
+as @var{ARRAY} and of rank one. If present, the number of elements in
+@var{VECTOR} shall be equal to or greater than the number of true elements
+in @var{MASK}. If @var{MASK} is scalar, the number of elements in
+@var{VECTOR} shall be equal to or greater than the number of elements in
+@var{ARRAY}.
+@end multitable
+
@item @emph{Return value}:
+The result is an array of rank one and the same type as that of @var{ARRAY}.
+If @var{VECTOR} is present, the result size is that of @var{VECTOR}, the
+number of @code{TRUE} values in @var{MASK} otherwise.
+
@item @emph{Example}:
-@item @emph{Specific names}:
+Gathering nonzero elements from an array:
+@smallexample
+PROGRAM test_pack_1
+ INTEGER :: m(6)
+ m = (/ 1, 0, 0, 0, 5, 0 /)
+ WRITE(*, FMT="(6(I0, ' '))") pack(m, m /= 0) ! "1 5"
+END PROGRAM
+@end smallexample
+
+Gathering nonzero elements from an array and appending elements from @var{VECTOR}:
+@smallexample
+PROGRAM test_pack_2
+ INTEGER :: m(4)
+ m = (/ 1, 0, 0, 2 /)
+ WRITE(*, FMT="(4(I0, ' '))") pack(m, m /= 0, (/ 0, 0, 3, 4 /)) ! "1 2 3 4"
+END PROGRAM
+@end smallexample
+
@item @emph{See also}:
@ref{UNPACK}
@end table
-
@node PERROR
@section @code{PERROR} --- Print system error message
-@cindex @code{PERROR} intrinsic
-@cindex undocumented intrinsic
-
-Intrinsic implemented, documentation pending.
+@fnindex PERROR
+@cindex system, error handling
@table @asis
@item @emph{Description}:
+Prints (on the C @code{stderr} stream) a newline-terminated error
+message corresponding to the last system error. This is prefixed by
+@var{STRING}, a colon and a space. See @code{perror(3)}.
+
@item @emph{Standard}:
GNU extension
Subroutine
@item @emph{Syntax}:
+@code{CALL PERROR(STRING)}
+
@item @emph{Arguments}:
-@item @emph{Return value}:
-@item @emph{Example}:
-@item @emph{Specific names}:
+@multitable @columnfractions .15 .70
+@item @var{STRING} @tab A scalar of type @code{CHARACTER} and of the
+default kind.
+@end multitable
+
@item @emph{See also}:
@ref{IERRNO}
@end table
-
@node PRECISION
@section @code{PRECISION} --- Decimal precision of a real kind
-@cindex @code{PRECISION} intrinsic
-@cindex precision of a real variable
+@fnindex PRECISION
+@cindex model representation, precision
@table @asis
@item @emph{Description}:
type of @code{X}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Inquiry function
@item @emph{Syntax}:
-@code{I = PRECISION(X)}
+@code{RESULT = PRECISION(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab shall be of type @code{REAL} or @code{COMPLEX}.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab Shall be of type @code{REAL} or @code{COMPLEX}.
@end multitable
@item @emph{Return value}:
@node PRESENT
-@section @code{PRESENT} --- Determine whether an optional argument is specified
-@cindex @code{PRESENT} intrinsic
-@cindex undocumented intrinsic
-
-Intrinsic implemented, documentation pending.
+@section @code{PRESENT} --- Determine whether an optional dummy argument is specified
+@fnindex PRESENT
@table @asis
@item @emph{Description}:
+Determines whether an optional dummy argument is present.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Inquiry function
@item @emph{Syntax}:
+@code{RESULT = PRESENT(A)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{A} @tab May be of any type and may be a pointer, scalar or array
+value, or a dummy procedure. It shall be the name of an optional dummy argument
+accessible within the current subroutine or function.
+@end multitable
+
@item @emph{Return value}:
+Returns either @code{TRUE} if the optional argument @var{A} is present, or
+@code{FALSE} otherwise.
+
@item @emph{Example}:
-@item @emph{See also}:
+@smallexample
+PROGRAM test_present
+ WRITE(*,*) f(), f(42) ! "F T"
+CONTAINS
+ LOGICAL FUNCTION f(x)
+ INTEGER, INTENT(IN), OPTIONAL :: x
+ f = PRESENT(x)
+ END FUNCTION
+END PROGRAM
+@end smallexample
@end table
-
@node PRODUCT
@section @code{PRODUCT} --- Product of array elements
-@cindex @code{PRODUCT} intrinsic
-@cindex undocumented intrinsic
-
-Intrinsic implemented, documentation pending.
+@fnindex PRODUCT
+@cindex array, product
+@cindex array, multiply elements
+@cindex array, conditionally multiply elements
+@cindex multiply array elements
@table @asis
@item @emph{Description}:
+Multiplies the elements of @var{ARRAY} along dimension @var{DIM} if
+the corresponding element in @var{MASK} is @code{TRUE}.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Transformational function
@item @emph{Syntax}:
+@multitable @columnfractions .80
+@item @code{RESULT = PRODUCT(ARRAY[, MASK])}
+@item @code{RESULT = PRODUCT(ARRAY, DIM[, MASK])}
+@end multitable
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{ARRAY} @tab Shall be an array of type @code{INTEGER},
+@code{REAL} or @code{COMPLEX}.
+@item @var{DIM} @tab (Optional) shall be a scalar of type
+@code{INTEGER} with a value in the range from 1 to n, where n
+equals the rank of @var{ARRAY}.
+@item @var{MASK} @tab (Optional) shall be of type @code{LOGICAL}
+and either be a scalar or an array of the same shape as @var{ARRAY}.
+@end multitable
+
@item @emph{Return value}:
+The result is of the same type as @var{ARRAY}.
+
+If @var{DIM} is absent, a scalar with the product of all elements in
+@var{ARRAY} is returned. Otherwise, an array of rank n-1, where n equals
+the rank of @var{ARRAY}, and a shape similar to that of @var{ARRAY} with
+dimension @var{DIM} dropped is returned.
+
+
@item @emph{Example}:
-@item @emph{Specific names}:
+@smallexample
+PROGRAM test_product
+ INTEGER :: x(5) = (/ 1, 2, 3, 4 ,5 /)
+ print *, PRODUCT(x) ! all elements, product = 120
+ print *, PRODUCT(x, MASK=MOD(x, 2)==1) ! odd elements, product = 15
+END PROGRAM
+@end smallexample
+
@item @emph{See also}:
@ref{SUM}
@end table
-
@node RADIX
@section @code{RADIX} --- Base of a model number
-@cindex @code{RADIX} intrinsic
-@cindex base
+@fnindex RADIX
+@cindex model representation, base
+@cindex model representation, radix
@table @asis
@item @emph{Description}:
@code{RADIX(X)} returns the base of the model representing the entity @var{X}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Inquiry function
@item @emph{Syntax}:
-@code{R = RADIX(X)}
+@code{RESULT = RADIX(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
+@multitable @columnfractions .15 .70
@item @var{X} @tab Shall be of type @code{INTEGER} or @code{REAL}
@end multitable
-@node RANDOM_NUMBER
-@section @code{RANDOM_NUMBER} --- Pseudo-random number
-@cindex @code{RANDOM_NUMBER} intrinsic
-@cindex random numbers
-
-Intrinsic implemented, documentation pending.
+@node RAN
+@section @code{RAN} --- Real pseudo-random number
+@fnindex RAN
+@cindex random number generation
@table @asis
@item @emph{Description}:
-@item @emph{Standard}:
-F95 and later
-
-@item @emph{Class}:
-Elemental subroutine
-
-@item @emph{Syntax}:
-@item @emph{Arguments}:
-@item @emph{Return value}:
-@item @emph{Example}:
-@item @emph{See also}:
-@ref{RANDOM_SEED}
-@end table
-
-
-
-
-@node RANDOM_SEED
-@section @code{RANDOM_SEED} --- Initialize a pseudo-random number sequence
-@cindex @code{RANDOM_SEED} intrinsic
-@cindex random numbers
-
-Intrinsic implemented, documentation pending.
+For compatibility with HP FORTRAN 77/iX, the @code{RAN} intrinsic is
+provided as an alias for @code{RAND}. See @ref{RAND} for complete
+documentation.
-@table @asis
-@item @emph{Description}:
@item @emph{Standard}:
-F95 and later
+GNU extension
@item @emph{Class}:
-Subroutine
+Function
-@item @emph{Syntax}:
-@item @emph{Arguments}:
-@item @emph{Return value}:
-@item @emph{Example}:
@item @emph{See also}:
-@ref{RANDOM_NUMBER}
+@ref{RAND}, @ref{RANDOM_NUMBER}
@end table
-
@node RAND
@section @code{RAND} --- Real pseudo-random number
-@cindex @code{RAND} intrinsic
-@cindex @code{RAN} intrinsic
-@cindex random numbers
+@fnindex RAND
+@cindex random number generation
@table @asis
@item @emph{Description}:
is restarted by @code{CALL SRAND(0)}; if @var{FLAG} has any other value,
it is used as a new seed with @code{SRAND}.
+This intrinsic routine is provided for backwards compatibility with
+GNU Fortran 77. It implements a simple modulo generator as provided
+by @command{g77}. For new code, one should consider the use of
+@ref{RANDOM_NUMBER} as it implements a superior algorithm.
+
@item @emph{Standard}:
GNU extension
@item @emph{Class}:
-non-elemental function
+Function
@item @emph{Syntax}:
-@code{X = RAND(FLAG)}
+@code{RESULT = RAND(I)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{FLAG} @tab shall be a scalar @code{INTEGER} of kind 4.
+@multitable @columnfractions .15 .70
+@item @var{I} @tab Shall be a scalar @code{INTEGER} of kind 4.
@end multitable
@item @emph{Return value}:
end program test_rand
@end smallexample
-@item @emph{Note}:
-For compatibility with HP FORTRAN 77/iX, the @code{RAN} intrinsic is
-provided as an alias for @code{RAND}.
-
@item @emph{See also}:
@ref{SRAND}, @ref{RANDOM_NUMBER}
-@node RANGE
-@section @code{RANGE} --- Decimal exponent range of a real kind
-@cindex @code{RANGE} intrinsic
-@cindex range of a real variable
+@node RANDOM_NUMBER
+@section @code{RANDOM_NUMBER} --- Pseudo-random number
+@fnindex RANDOM_NUMBER
+@cindex random number generation
@table @asis
@item @emph{Description}:
-@code{RANGE(X)} returns the decimal exponent range in the model of the
-type of @code{X}.
+Returns a single pseudorandom number or an array of pseudorandom numbers
+from the uniform distribution over the range @math{ 0 \leq x < 1}.
+
+The runtime-library implements George Marsaglia's KISS (Keep It Simple
+Stupid) random number generator (RNG). This RNG combines:
+@enumerate
+@item The congruential generator @math{x(n) = 69069 \cdot x(n-1) + 1327217885}
+with a period of @math{2^{32}},
+@item A 3-shift shift-register generator with a period of @math{2^{32} - 1},
+@item Two 16-bit multiply-with-carry generators with a period of
+@math{597273182964842497 > 2^{59}}.
+@end enumerate
+The overall period exceeds @math{2^{123}}.
+
+Please note, this RNG is thread safe if used within OpenMP directives,
+i.e., its state will be consistent while called from multiple threads.
+However, the KISS generator does not create random numbers in parallel
+from multiple sources, but in sequence from a single source. If an
+OpenMP-enabled application heavily relies on random numbers, one should
+consider employing a dedicated parallel random number generator instead.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
-Inquiry function
+Subroutine
@item @emph{Syntax}:
-@code{I = RANGE(X)}
+@code{RANDOM_NUMBER(HARVEST)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab shall be of type @code{REAL} or @code{COMPLEX}.
+@multitable @columnfractions .15 .70
+@item @var{HARVEST} @tab Shall be a scalar or an array of type @code{REAL}.
@end multitable
-@item @emph{Return value}:
-The return value is of type @code{INTEGER} and of the default integer
-kind.
-
@item @emph{Example}:
-See @code{PRECISION} for an example.
+@smallexample
+program test_random_number
+ REAL :: r(5,5)
+ CALL init_random_seed() ! see example of RANDOM_SEED
+ CALL RANDOM_NUMBER(r)
+end program
+@end smallexample
+
+@item @emph{See also}:
+@ref{RANDOM_SEED}
@end table
-@node RAN
-@section @code{RAN} --- Real pseudo-random number
-@cindex @code{RAN} intrinsic
-@cindex random numbers
+@node RANDOM_SEED
+@section @code{RANDOM_SEED} --- Initialize a pseudo-random number sequence
+@fnindex RANDOM_SEED
+@cindex random number generation, seeding
+@cindex seeding a random number generator
@table @asis
+@item @emph{Description}:
+Restarts or queries the state of the pseudorandom number generator used by
+@code{RANDOM_NUMBER}.
+
+If @code{RANDOM_SEED} is called without arguments, it is initialized to
+a default state. The example below shows how to initialize the random
+seed based on the system's time.
+
@item @emph{Standard}:
-GNU extension
+Fortran 95 and later
+
+@item @emph{Class}:
+Subroutine
+
+@item @emph{Syntax}:
+@code{CALL RANDOM_SEED([SIZE, PUT, GET])}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{SIZE} @tab (Optional) Shall be a scalar and of type default
+@code{INTEGER}, with @code{INTENT(OUT)}. It specifies the minimum size
+of the arrays used with the @var{PUT} and @var{GET} arguments.
+@item @var{PUT} @tab (Optional) Shall be an array of type default
+@code{INTEGER} and rank one. It is @code{INTENT(IN)} and the size of
+the array must be larger than or equal to the number returned by the
+@var{SIZE} argument.
+@item @var{GET} @tab (Optional) Shall be an array of type default
+@code{INTEGER} and rank one. It is @code{INTENT(OUT)} and the size
+of the array must be larger than or equal to the number returned by
+the @var{SIZE} argument.
+@end multitable
+
+@item @emph{Example}:
+@smallexample
+SUBROUTINE init_random_seed()
+ INTEGER :: i, n, clock
+ INTEGER, DIMENSION(:), ALLOCATABLE :: seed
+
+ CALL RANDOM_SEED(size = n)
+ ALLOCATE(seed(n))
+
+ CALL SYSTEM_CLOCK(COUNT=clock)
+
+ seed = clock + 37 * (/ (i - 1, i = 1, n) /)
+ CALL RANDOM_SEED(PUT = seed)
+
+ DEALLOCATE(seed)
+END SUBROUTINE
+@end smallexample
@item @emph{See also}:
-@ref{RAND}, @ref{RANDOM_NUMBER}
+@ref{RANDOM_NUMBER}
+@end table
+
+
+
+@node RANGE
+@section @code{RANGE} --- Decimal exponent range
+@fnindex RANGE
+@cindex model representation, range
+
+@table @asis
+@item @emph{Description}:
+@code{RANGE(X)} returns the decimal exponent range in the model of the
+type of @code{X}.
+
+@item @emph{Standard}:
+Fortran 95 and later
+
+@item @emph{Class}:
+Inquiry function
+
+@item @emph{Syntax}:
+@code{RESULT = RANGE(X)}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{X} @tab Shall be of type @code{INTEGER}, @code{REAL}
+or @code{COMPLEX}.
+@end multitable
+
+@item @emph{Return value}:
+The return value is of type @code{INTEGER} and of the default integer
+kind.
+
+@item @emph{Example}:
+See @code{PRECISION} for an example.
@end table
@node REAL
@section @code{REAL} --- Convert to real type
-@cindex @code{REAL} intrinsic
-@cindex @code{REALPART} intrinsic
-@cindex true values
+@fnindex REAL
+@fnindex REALPART
+@cindex conversion, to real
+@cindex complex numbers, real part
@table @asis
@item @emph{Description}:
-@code{REAL(X [, KIND])} converts its argument @var{X} to a real type. The
-@code{REALPART(X)} function is provided for compatibility with @command{g77},
+@code{REAL(A [, KIND])} converts its argument @var{A} to a real type. The
+@code{REALPART} function is provided for compatibility with @command{g77},
and its use is strongly discouraged.
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@multitable @columnfractions .30 .80
-@item @code{X = REAL(X)}
-@item @code{X = REAL(X, KIND)}
-@item @code{X = REALPART(Z)}
+@multitable @columnfractions .80
+@item @code{RESULT = REAL(A [, KIND])}
+@item @code{RESULT = REALPART(Z)}
@end multitable
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab shall be @code{INTEGER(*)}, @code{REAL(*)}, or
-@code{COMPLEX(*)}.
-@item @var{KIND} @tab (Optional) @var{KIND} shall be a scalar integer.
+@multitable @columnfractions .15 .70
+@item @var{A} @tab Shall be @code{INTEGER}, @code{REAL}, or
+@code{COMPLEX}.
+@item @var{KIND} @tab (Optional) An @code{INTEGER} initialization
+expression indicating the kind parameter of the result.
@end multitable
@item @emph{Return value}:
-These functions return a @code{REAL(*)} variable or array under
+These functions return a @code{REAL} variable or array under
the following rules:
@table @asis
@item (A)
-@code{REAL(X)} is converted to a default real type if @var{X} is an
+@code{REAL(A)} is converted to a default real type if @var{A} is an
integer or real variable.
@item (B)
-@code{REAL(X)} is converted to a real type with the kind type parameter
-of @var{X} if @var{X} is a complex variable.
+@code{REAL(A)} is converted to a real type with the kind type parameter
+of @var{A} if @var{A} is a complex variable.
@item (C)
-@code{REAL(X, KIND)} is converted to a real type with kind type
-parameter @var{KIND} if @var{X} is a complex, integer, or real
+@code{REAL(A, KIND)} is converted to a real type with kind type
+parameter @var{KIND} if @var{A} is a complex, integer, or real
variable.
@end table
@end table
+
@node RENAME
@section @code{RENAME} --- Rename a file
-@cindex @code{RENAME} intrinsic
-@cindex file system operations
-
-Intrinsic implemented, documentation pending.
+@fnindex RENAME
+@cindex file system, rename file
@table @asis
@item @emph{Description}:
+Renames a file from file @var{PATH1} to @var{PATH2}. A null
+character (@code{CHAR(0)}) can be used to mark the end of the names in
+@var{PATH1} and @var{PATH2}; otherwise, trailing blanks in the file
+names are ignored. If the @var{STATUS} argument is supplied, it
+contains 0 on success or a nonzero error code upon return; see
+@code{rename(2)}.
+
+This intrinsic is provided in both subroutine and function forms;
+however, only one form can be used in any given program unit.
+
@item @emph{Standard}:
GNU extension
@item @emph{Class}:
-Subroutine
+Subroutine, function
@item @emph{Syntax}:
+@multitable @columnfractions .80
+@item @code{CALL RENAME(PATH1, PATH2 [, STATUS])}
+@item @code{STATUS = RENAME(PATH1, PATH2)}
+@end multitable
+
@item @emph{Arguments}:
-@item @emph{Return value}:
-@item @emph{Example}:
+@multitable @columnfractions .15 .70
+@item @var{PATH1} @tab Shall be of default @code{CHARACTER} type.
+@item @var{PATH2} @tab Shall be of default @code{CHARACTER} type.
+@item @var{STATUS} @tab (Optional) Shall be of default @code{INTEGER} type.
+@end multitable
+
@item @emph{See also}:
-@end table
+@ref{LINK}
+@end table
@node REPEAT
@section @code{REPEAT} --- Repeated string concatenation
-@cindex @code{REPEAT} intrinsic
-@cindex string manipulation
-
-Intrinsic implemented, documentation pending.
+@fnindex REPEAT
+@cindex string, repeat
+@cindex string, concatenate
@table @asis
@item @emph{Description}:
+Concatenates @var{NCOPIES} copies of a string.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Transformational function
@item @emph{Syntax}:
+@code{RESULT = REPEAT(STRING, NCOPIES)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{STRING} @tab Shall be scalar and of type @code{CHARACTER}.
+@item @var{NCOPIES} @tab Shall be scalar and of type @code{INTEGER}.
+@end multitable
+
@item @emph{Return value}:
+A new scalar of type @code{CHARACTER} built up from @var{NCOPIES} copies
+of @var{STRING}.
+
@item @emph{Example}:
-@item @emph{See also}:
+@smallexample
+program test_repeat
+ write(*,*) repeat("x", 5) ! "xxxxx"
+end program
+@end smallexample
@end table
-
@node RESHAPE
@section @code{RESHAPE} --- Function to reshape an array
-@cindex @code{RESHAPE} intrinsic
-@cindex array manipulation
-
-Intrinsic implemented, documentation pending.
+@fnindex RESHAPE
+@cindex array, change dimensions
+@cindex array, transmogrify
@table @asis
@item @emph{Description}:
+Reshapes @var{SOURCE} to correspond to @var{SHAPE}. If necessary,
+the new array may be padded with elements from @var{PAD} or permuted
+as defined by @var{ORDER}.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Transformational function
@item @emph{Syntax}:
+@code{RESULT = RESHAPE(SOURCE, SHAPE[, PAD, ORDER])}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{SOURCE} @tab Shall be an array of any type.
+@item @var{SHAPE} @tab Shall be of type @code{INTEGER} and an
+array of rank one. Its values must be positive or zero.
+@item @var{PAD} @tab (Optional) shall be an array of the same
+type as @var{SOURCE}.
+@item @var{ORDER} @tab (Optional) shall be of type @code{INTEGER}
+and an array of the same shape as @var{SHAPE}. Its values shall
+be a permutation of the numbers from 1 to n, where n is the size of
+@var{SHAPE}. If @var{ORDER} is absent, the natural ordering shall
+be assumed.
+@end multitable
+
@item @emph{Return value}:
+The result is an array of shape @var{SHAPE} with the same type as
+@var{SOURCE}.
+
@item @emph{Example}:
+@smallexample
+PROGRAM test_reshape
+ INTEGER, DIMENSION(4) :: x
+ WRITE(*,*) SHAPE(x) ! prints "4"
+ WRITE(*,*) SHAPE(RESHAPE(x, (/2, 2/))) ! prints "2 2"
+END PROGRAM
+@end smallexample
+
@item @emph{See also}:
@ref{SHAPE}
@end table
@node RRSPACING
@section @code{RRSPACING} --- Reciprocal of the relative spacing
-@cindex @code{RRSPACING} intrinsic
+@fnindex RRSPACING
+@cindex real number, relative spacing
+@cindex floating point, relative spacing
+
@table @asis
@item @emph{Description}:
model numbers near @var{X}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{Y = RRSPACING(X)}
+@code{RESULT = RRSPACING(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab shall be of type @code{REAL}.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab Shall be of type @code{REAL}.
@end multitable
@item @emph{Return value}:
The value returned is equal to
@code{ABS(FRACTION(X)) * FLOAT(RADIX(X))**DIGITS(X)}.
+@item @emph{See also}:
+@ref{SPACING}
@end table
@node RSHIFT
@section @code{RSHIFT} --- Right shift bits
-@cindex @code{RSHIFT} intrinsic
-@cindex bit operations
-
-Not yet implemented in GNU Fortran.
+@fnindex RSHIFT
+@cindex bits, shift right
@table @asis
@item @emph{Description}:
+@code{RSHIFT} returns a value corresponding to @var{I} with all of the
+bits shifted right by @var{SHIFT} places. If the absolute value of
+@var{SHIFT} is greater than @code{BIT_SIZE(I)}, the value is undefined.
+Bits shifted out from the left end are lost; zeros are shifted in from
+the opposite end.
+
+This function has been superseded by the @code{ISHFT} intrinsic, which
+is standard in Fortran 95 and later.
@item @emph{Standard}:
GNU extension
@item @emph{Class}:
-Function
+Elemental function
@item @emph{Syntax}:
+@code{RESULT = RSHIFT(I, SHIFT)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{I} @tab The type shall be @code{INTEGER}.
+@item @var{SHIFT} @tab The type shall be @code{INTEGER}.
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
+The return value is of type @code{INTEGER} and of the same kind as
+@var{I}.
+
@item @emph{See also}:
+@ref{ISHFT}, @ref{ISHFTC}, @ref{LSHIFT}
@end table
@node SCALE
@section @code{SCALE} --- Scale a real value
-@cindex @code{SCALE} intrinsic
+@fnindex SCALE
+@cindex real number, scale
+@cindex floating point, scale
@table @asis
@item @emph{Description}:
@code{SCALE(X,I)} returns @code{X * RADIX(X)**I}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{Y = SCALE(X, I)}
+@code{RESULT = SCALE(X, I)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
+@multitable @columnfractions .15 .70
@item @var{X} @tab The type of the argument shall be a @code{REAL}.
@item @var{I} @tab The type of the argument shall be a @code{INTEGER}.
@end multitable
@end table
+
@node SCAN
@section @code{SCAN} --- Scan a string for the presence of a set of characters
-@cindex @code{SCAN} intrinsic
-@cindex string manipulation
-
-Intrinsic implemented, documentation pending.
+@fnindex SCAN
+@cindex string, find subset
@table @asis
@item @emph{Description}:
+Scans a @var{STRING} for any of the characters in a @var{SET}
+of characters.
+
+If @var{BACK} is either absent or equals @code{FALSE}, this function
+returns the position of the leftmost character of @var{STRING} that is
+in @var{SET}. If @var{BACK} equals @code{TRUE}, the rightmost position
+is returned. If no character of @var{SET} is found in @var{STRING}, the
+result is zero.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later, with @var{KIND} argument Fortran 2003 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
+@code{RESULT = SCAN(STRING, SET[, BACK [, KIND]])}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{STRING} @tab Shall be of type @code{CHARACTER}.
+@item @var{SET} @tab Shall be of type @code{CHARACTER}.
+@item @var{BACK} @tab (Optional) shall be of type @code{LOGICAL}.
+@item @var{KIND} @tab (Optional) An @code{INTEGER} initialization
+expression indicating the kind parameter of the result.
+@end multitable
+
@item @emph{Return value}:
+The return value is of type @code{INTEGER} and of kind @var{KIND}. If
+@var{KIND} is absent, the return value is of default integer kind.
+
@item @emph{Example}:
+@smallexample
+PROGRAM test_scan
+ WRITE(*,*) SCAN("FORTRAN", "AO") ! 2, found 'O'
+ WRITE(*,*) SCAN("FORTRAN", "AO", .TRUE.) ! 6, found 'A'
+ WRITE(*,*) SCAN("FORTRAN", "C++") ! 0, found none
+END PROGRAM
+@end smallexample
+
@item @emph{See also}:
+@ref{INDEX intrinsic}, @ref{VERIFY}
@end table
-
@node SECNDS
@section @code{SECNDS} --- Time function
-@cindex @code{SECNDS} intrinsic
-@cindex time, current
-@cindex current time
+@fnindex SECNDS
+@cindex time, elapsed
+@cindex elapsed time
@table @asis
@item @emph{Description}:
GNU extension
@item @emph{Class}:
-function
+Function
@item @emph{Syntax}:
-@code{T = SECNDS (X)}
+@code{RESULT = SECNDS (X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item Name @tab Type
-@item @var{T} @tab REAL(4)
-@item @var{X} @tab REAL(4)
+@multitable @columnfractions .15 .70
+@item @var{T} @tab Shall be of type @code{REAL(4)}.
+@item @var{X} @tab Shall be of type @code{REAL(4)}.
@end multitable
@item @emph{Return value}:
@item @emph{Example}:
@smallexample
program test_secnds
+ integer :: i
real(4) :: t1, t2
print *, secnds (0.0) ! seconds since midnight
t1 = secnds (0.0) ! reference time
+@node SECOND
+@section @code{SECOND} --- CPU time function
+@fnindex SECOND
+@cindex time, elapsed
+@cindex elapsed time
+
+@table @asis
+@item @emph{Description}:
+Returns a @code{REAL(4)} value representing the elapsed CPU time in
+seconds. This provides the same functionality as the standard
+@code{CPU_TIME} intrinsic, and is only included for backwards
+compatibility.
+
+This intrinsic is provided in both subroutine and function forms;
+however, only one form can be used in any given program unit.
+
+@item @emph{Standard}:
+GNU extension
+
+@item @emph{Class}:
+Subroutine, function
+
+@item @emph{Syntax}:
+@multitable @columnfractions .80
+@item @code{CALL SECOND(TIME)}
+@item @code{TIME = SECOND()}
+@end multitable
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{TIME} @tab Shall be of type @code{REAL(4)}.
+@end multitable
+
+@item @emph{Return value}:
+In either syntax, @var{TIME} is set to the process's current runtime in
+seconds.
+
+@item @emph{See also}:
+@ref{CPU_TIME}
+
+@end table
+
+
+
+@node SELECTED_CHAR_KIND
+@section @code{SELECTED_CHAR_KIND} --- Choose character kind
+@fnindex SELECTED_CHAR_KIND
+@cindex character kind
+@cindex kind, character
+
+@table @asis
+@item @emph{Description}:
+
+@code{SELECTED_CHAR_KIND(NAME)} returns the kind value for the character
+set named @var{NAME}, if a character set with such a name is supported,
+or @math{-1} otherwise. Currently, supported character sets include
+``ASCII'' and ``DEFAULT'', which are equivalent.
+
+@item @emph{Standard}:
+Fortran 2003 and later
+
+@item @emph{Class}:
+Transformational function
+
+@item @emph{Syntax}:
+@code{RESULT = SELECTED_CHAR_KIND(NAME)}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{NAME} @tab Shall be a scalar and of the default character type.
+@end multitable
+
+@item @emph{Example}:
+@smallexample
+program ascii_kind
+ integer,parameter :: ascii = selected_char_kind("ascii")
+ character(kind=ascii, len=26) :: s
+
+ s = ascii_"abcdefghijklmnopqrstuvwxyz"
+ print *, s
+end program ascii_kind
+@end smallexample
+@end table
+
+
+
@node SELECTED_INT_KIND
@section @code{SELECTED_INT_KIND} --- Choose integer kind
-@cindex @code{SELECTED_INT_KIND} intrinsic
+@fnindex SELECTED_INT_KIND
@cindex integer kind
+@cindex kind, integer
@table @asis
@item @emph{Description}:
-@code{SELECTED_INT_KIND(I)} return the kind value of the smallest integer
-type that can represent all values ranging from @math{-10^I} (exclusive)
-to @math{10^I} (exclusive). If there is no integer kind that accommodates
+@code{SELECTED_INT_KIND(R)} return the kind value of the smallest integer
+type that can represent all values ranging from @math{-10^R} (exclusive)
+to @math{10^R} (exclusive). If there is no integer kind that accommodates
this range, @code{SELECTED_INT_KIND} returns @math{-1}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Transformational function
@item @emph{Syntax}:
-@multitable @columnfractions .30 .80
-@item @code{J = SELECTED_INT_KIND(I)}
-@end multitable
+@code{RESULT = SELECTED_INT_KIND(R)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{I} @tab shall be a scalar and of type @code{INTEGER}.
+@multitable @columnfractions .15 .70
+@item @var{R} @tab Shall be a scalar and of type @code{INTEGER}.
@end multitable
@item @emph{Example}:
@node SELECTED_REAL_KIND
@section @code{SELECTED_REAL_KIND} --- Choose real kind
-@cindex @code{SELECTED_REAL_KIND} intrinsic
+@fnindex SELECTED_REAL_KIND
@cindex real kind
+@cindex kind, real
@table @asis
@item @emph{Description}:
-@code{SELECTED_REAL_KIND(P,R)} return the kind value of a real data type
-with decimal precision greater of at least @code{P} digits and exponent
+@code{SELECTED_REAL_KIND(P,R)} returns the kind value of a real data type
+with decimal precision of at least @code{P} digits and exponent
range greater at least @code{R}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Transformational function
@item @emph{Syntax}:
-@multitable @columnfractions .30 .80
-@item @code{I = SELECTED_REAL_KIND(P,R)}
-@end multitable
+@code{RESULT = SELECTED_REAL_KIND([P, R])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
+@multitable @columnfractions .15 .70
@item @var{P} @tab (Optional) shall be a scalar and of type @code{INTEGER}.
@item @var{R} @tab (Optional) shall be a scalar and of type @code{INTEGER}.
@end multitable
@node SET_EXPONENT
@section @code{SET_EXPONENT} --- Set the exponent of the model
-@cindex @code{SET_EXPONENT} intrinsic
-@cindex exponent part of a real number
+@fnindex SET_EXPONENT
+@cindex real number, set exponent
+@cindex floating point, set exponent
@table @asis
@item @emph{Description}:
is that that of @var{X} and whose exponent part is @var{I}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{Y = SET_EXPONENT(X, I)}
+@code{RESULT = SET_EXPONENT(X, I)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab shall be of type @code{REAL}.
-@item @var{I} @tab shall be of type @code{INTEGER}.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab Shall be of type @code{REAL}.
+@item @var{I} @tab Shall be of type @code{INTEGER}.
@end multitable
@item @emph{Return value}:
@item @emph{Example}:
@smallexample
-program test_setexp
- real :: x = 178.1387e-4
- integer :: i = 17
- print *, set_exponent(x), fraction(x) * radix(x)**i
-end program test_setexp
+PROGRAM test_setexp
+ REAL :: x = 178.1387e-4
+ INTEGER :: i = 17
+ PRINT *, SET_EXPONENT(x, i), FRACTION(x) * RADIX(x)**i
+END PROGRAM
@end smallexample
@end table
@node SHAPE
@section @code{SHAPE} --- Determine the shape of an array
-@cindex @code{SHAPE} intrinsic
-@cindex array manipulation
-
-Intrinsic implemented, documentation pending.
+@fnindex SHAPE
+@cindex array, shape
@table @asis
@item @emph{Description}:
+Determines the shape of an array.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Inquiry function
@item @emph{Syntax}:
+@code{RESULT = SHAPE(SOURCE)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{SOURCE} @tab Shall be an array or scalar of any type.
+If @var{SOURCE} is a pointer it must be associated and allocatable
+arrays must be allocated.
+@end multitable
+
@item @emph{Return value}:
+An @code{INTEGER} array of rank one with as many elements as @var{SOURCE}
+has dimensions. The elements of the resulting array correspond to the extend
+of @var{SOURCE} along the respective dimensions. If @var{SOURCE} is a scalar,
+the result is the rank one array of size zero.
+
@item @emph{Example}:
+@smallexample
+PROGRAM test_shape
+ INTEGER, DIMENSION(-1:1, -1:2) :: A
+ WRITE(*,*) SHAPE(A) ! (/ 3, 4 /)
+ WRITE(*,*) SIZE(SHAPE(42)) ! (/ /)
+END PROGRAM
+@end smallexample
+
@item @emph{See also}:
-@ref{RESHAPE}
+@ref{RESHAPE}, @ref{SIZE}
@end table
-
@node SIGN
@section @code{SIGN} --- Sign copying function
-@cindex @code{SIGN} intrinsic
-@cindex @code{ISIGN} intrinsic
-@cindex @code{DSIGN} intrinsic
+@fnindex SIGN
+@fnindex ISIGN
+@fnindex DSIGN
@cindex sign copying
@table @asis
@code{SIGN(A,B)} returns the value of @var{A} with the sign of @var{B}.
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = SIGN(A,B)}
+@code{RESULT = SIGN(A, B)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{A} @tab shall be a scalar of type @code{INTEGER} or @code{REAL}
-@item @var{B} @tab shall be a scalar of the same type and kind as @var{A}
+@multitable @columnfractions .15 .70
+@item @var{A} @tab Shall be of type @code{INTEGER} or @code{REAL}
+@item @var{B} @tab Shall be of the same type and kind as @var{A}
@end multitable
@item @emph{Return value}:
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Arguments @tab Return type @tab Standard
@item @code{ISIGN(A,P)} @tab @code{INTEGER(4)} @tab @code{INTEGER(4)} @tab f95, gnu
@item @code{DSIGN(A,P)} @tab @code{REAL(8)} @tab @code{REAL(8)} @tab f95, gnu
@node SIGNAL
@section @code{SIGNAL} --- Signal handling subroutine (or function)
-@cindex @code{SIGNAL} intrinsic
-@cindex signal handling
+@fnindex SIGNAL
+@cindex system, signal handling
@table @asis
@item @emph{Description}:
GNU extension
@item @emph{Class}:
-subroutine, non-elemental function
+Subroutine, function
@item @emph{Syntax}:
-@multitable @columnfractions .30 .80
-@item @code{CALL SIGNAL(NUMBER, HANDLER)}
-@item @code{CALL SIGNAL(NUMBER, HANDLER, STATUS)}
+@multitable @columnfractions .80
+@item @code{CALL SIGNAL(NUMBER, HANDLER [, STATUS])}
@item @code{STATUS = SIGNAL(NUMBER, HANDLER)}
@end multitable
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{NUMBER} @tab shall be a scalar integer, with @code{INTENT(IN)}
+@multitable @columnfractions .15 .70
+@item @var{NUMBER} @tab Shall be a scalar integer, with @code{INTENT(IN)}
@item @var{HANDLER}@tab Signal handler (@code{INTEGER FUNCTION} or
@code{SUBROUTINE}) or dummy/global @code{INTEGER} scalar.
@code{INTEGER}. It is @code{INTENT(IN)}.
@item @var{STATUS} @tab (Optional) @var{STATUS} shall be a scalar
integer. It has @code{INTENT(OUT)}.
@end multitable
+@c TODO: What should the interface of the handler be? Does it take arguments?
@item @emph{Return value}:
The @code{SIGNAL} function returns the value returned by @code{signal(2)}.
-
@node SIN
@section @code{SIN} --- Sine function
-@cindex @code{SIN} intrinsic
-@cindex @code{DSIN} intrinsic
-@cindex @code{ZSIN} intrinsic
-@cindex @code{CDSIN} intrinsic
-@cindex trigonometric functions
+@fnindex SIN
+@fnindex DSIN
+@fnindex CSIN
+@fnindex ZSIN
+@fnindex CDSIN
+@cindex trigonometric function, sine
+@cindex sine
@table @asis
@item @emph{Description}:
@code{SIN(X)} computes the sine of @var{X}.
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = SIN(X)}
+@code{RESULT = SIN(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)} or
-@code{COMPLEX(*)}.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be @code{REAL} or
+@code{COMPLEX}.
@end multitable
@item @emph{Return value}:
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
@item @code{DSIN(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab f95, gnu
@item @code{CSIN(X)} @tab @code{COMPLEX(4) X} @tab @code{COMPLEX(4)} @tab f95, gnu
@node SINH
@section @code{SINH} --- Hyperbolic sine function
-@cindex @code{SINH} intrinsic
-@cindex @code{DSINH} intrinsic
+@fnindex SINH
+@fnindex DSINH
@cindex hyperbolic sine
+@cindex hyperbolic function, sine
+@cindex sine, hyperbolic
@table @asis
@item @emph{Description}:
@code{SINH(X)} computes the hyperbolic sine of @var{X}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later, for a complex argument Fortran 2008 or later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = SINH(X)}
+@code{RESULT = SINH(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)}.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be @code{REAL} or @code{COMPLEX}.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{REAL(*)}.
+The return value has same type and kind as @var{X}.
@item @emph{Example}:
@smallexample
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
-@item @code{DSINH(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab F95 and later
+@item @code{DSINH(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab Fortran 95 and later
@end multitable
@item @emph{See also}:
@node SIZE
@section @code{SIZE} --- Determine the size of an array
-@cindex @code{SIZE} intrinsic
-@cindex array manipulation
-
-Intrinsic implemented, documentation pending.
+@fnindex SIZE
+@cindex array, size
+@cindex array, number of elements
+@cindex array, count elements
@table @asis
@item @emph{Description}:
+Determine the extent of @var{ARRAY} along a specified dimension @var{DIM},
+or the total number of elements in @var{ARRAY} if @var{DIM} is absent.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later, with @var{KIND} argument Fortran 2003 and later
@item @emph{Class}:
Inquiry function
@item @emph{Syntax}:
+@code{RESULT = SIZE(ARRAY[, DIM [, KIND]])}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{ARRAY} @tab Shall be an array of any type. If @var{ARRAY} is
+a pointer it must be associated and allocatable arrays must be allocated.
+@item @var{DIM} @tab (Optional) shall be a scalar of type @code{INTEGER}
+and its value shall be in the range from 1 to n, where n equals the rank
+of @var{ARRAY}.
+@item @var{KIND} @tab (Optional) An @code{INTEGER} initialization
+expression indicating the kind parameter of the result.
+@end multitable
+
+@item @emph{Return value}:
+The return value is of type @code{INTEGER} and of kind @var{KIND}. If
+@var{KIND} is absent, the return value is of default integer kind.
+
+@item @emph{Example}:
+@smallexample
+PROGRAM test_size
+ WRITE(*,*) SIZE((/ 1, 2 /)) ! 2
+END PROGRAM
+@end smallexample
+
+@item @emph{See also}:
+@ref{SHAPE}, @ref{RESHAPE}
+@end table
+
+
+@node SIZEOF
+@section @code{SIZEOF} --- Size in bytes of an expression
+@fnindex SIZEOF
+@cindex expression size
+@cindex size of an expression
+
+@table @asis
+@item @emph{Description}:
+@code{SIZEOF(X)} calculates the number of bytes of storage the
+expression @code{X} occupies.
+
+@item @emph{Standard}:
+GNU extension
+
+@item @emph{Class}:
+Intrinsic function
+
+@item @emph{Syntax}:
+@code{N = SIZEOF(X)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The argument shall be of any type, rank or shape.
+@end multitable
+
@item @emph{Return value}:
+The return value is of type integer and of the system-dependent kind
+@var{C_SIZE_T} (from the @var{ISO_C_BINDING} module). Its value is the
+number of bytes occupied by the argument. If the argument has the
+@code{POINTER} attribute, the number of bytes of the storage area pointed
+to is returned. If the argument is of a derived type with @code{POINTER}
+or @code{ALLOCATABLE} components, the return value doesn't account for
+the sizes of the data pointed to by these components.
+
@item @emph{Example}:
+@smallexample
+ integer :: i
+ real :: r, s(5)
+ print *, (sizeof(s)/sizeof(r) == 5)
+ end
+@end smallexample
+The example will print @code{.TRUE.} unless you are using a platform
+where default @code{REAL} variables are unusually padded.
+
@item @emph{See also}:
+@ref{C_SIZEOF}
+@end table
+
+
+@node SLEEP
+@section @code{SLEEP} --- Sleep for the specified number of seconds
+@fnindex SLEEP
+@cindex delayed execution
+
+@table @asis
+@item @emph{Description}:
+Calling this subroutine causes the process to pause for @var{SECONDS} seconds.
+
+@item @emph{Standard}:
+GNU extension
+
+@item @emph{Class}:
+Subroutine
+
+@item @emph{Syntax}:
+@code{CALL SLEEP(SECONDS)}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{SECONDS} @tab The type shall be of default @code{INTEGER}.
+@end multitable
+
+@item @emph{Example}:
+@smallexample
+program test_sleep
+ call sleep(5)
+end
+@end smallexample
@end table
@node SNGL
@section @code{SNGL} --- Convert double precision real to default real
-@cindex @code{SNGL} intrinsic
-@cindex conversion function (real)
+@fnindex SNGL
+@cindex conversion, to real
@table @asis
@item @emph{Description}:
that is specific to one type for @var{A}.
@item @emph{Standard}:
-GNU extension
+Fortran 77 and later
@item @emph{Class}:
-function
+Elemental function
@item @emph{Syntax}:
-@code{X = SNGL(A)}
+@code{RESULT = SNGL(A)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
+@multitable @columnfractions .15 .70
@item @var{A} @tab The type shall be a double precision @code{REAL}.
@end multitable
@node SPACING
@section @code{SPACING} --- Smallest distance between two numbers of a given type
-@cindex @code{SPACING} intrinsic
-@cindex undocumented intrinsic
-
-Intrinsic implemented, documentation pending.
+@fnindex SPACING
+@cindex real number, relative spacing
+@cindex floating point, relative spacing
@table @asis
@item @emph{Description}:
+Determines the distance between the argument @var{X} and the nearest
+adjacent number of the same type.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
+@code{RESULT = SPACING(X)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{X} @tab Shall be of type @code{REAL}.
+@end multitable
+
@item @emph{Return value}:
+The result is of the same type as the input argument @var{X}.
+
@item @emph{Example}:
+@smallexample
+PROGRAM test_spacing
+ INTEGER, PARAMETER :: SGL = SELECTED_REAL_KIND(p=6, r=37)
+ INTEGER, PARAMETER :: DBL = SELECTED_REAL_KIND(p=13, r=200)
+
+ WRITE(*,*) spacing(1.0_SGL) ! "1.1920929E-07" on i686
+ WRITE(*,*) spacing(1.0_DBL) ! "2.220446049250313E-016" on i686
+END PROGRAM
+@end smallexample
+
@item @emph{See also}:
+@ref{RRSPACING}
@end table
-
@node SPREAD
@section @code{SPREAD} --- Add a dimension to an array
-@cindex @code{SPREAD} intrinsic
-@cindex array manipulation
-
-Intrinsic implemented, documentation pending.
+@fnindex SPREAD
+@cindex array, increase dimension
+@cindex array, duplicate elements
+@cindex array, duplicate dimensions
@table @asis
@item @emph{Description}:
+Replicates a @var{SOURCE} array @var{NCOPIES} times along a specified
+dimension @var{DIM}.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Transformational function
@item @emph{Syntax}:
+@code{RESULT = SPREAD(SOURCE, DIM, NCOPIES)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{SOURCE} @tab Shall be a scalar or an array of any type and
+a rank less than seven.
+@item @var{DIM} @tab Shall be a scalar of type @code{INTEGER} with a
+value in the range from 1 to n+1, where n equals the rank of @var{SOURCE}.
+@item @var{NCOPIES} @tab Shall be a scalar of type @code{INTEGER}.
+@end multitable
+
@item @emph{Return value}:
+The result is an array of the same type as @var{SOURCE} and has rank n+1
+where n equals the rank of @var{SOURCE}.
+
@item @emph{Example}:
+@smallexample
+PROGRAM test_spread
+ INTEGER :: a = 1, b(2) = (/ 1, 2 /)
+ WRITE(*,*) SPREAD(A, 1, 2) ! "1 1"
+ WRITE(*,*) SPREAD(B, 1, 2) ! "1 1 2 2"
+END PROGRAM
+@end smallexample
+
@item @emph{See also}:
+@ref{UNPACK}
@end table
-
@node SQRT
@section @code{SQRT} --- Square-root function
-@cindex @code{SQRT} intrinsic
-@cindex @code{DSQRT} intrinsic
-@cindex @code{CSQRT} intrinsic
-@cindex @code{ZSQRT} intrinsic
-@cindex @code{CDSQRT} intrinsic
+@fnindex SQRT
+@fnindex DSQRT
+@fnindex CSQRT
+@fnindex ZSQRT
+@fnindex CDSQRT
+@cindex root
@cindex square-root
@table @asis
@code{SQRT(X)} computes the square root of @var{X}.
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = SQRT(X)}
+@code{RESULT = SQRT(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)} or
-@code{COMPLEX(*)}.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be @code{REAL} or
+@code{COMPLEX}.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{REAL(*)} or @code{COMPLEX(*)}.
+The return value is of type @code{REAL} or @code{COMPLEX}.
The kind type parameter is the same as @var{X}.
@item @emph{Example}:
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
-@item @code{DSQRT(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab F95 and later
-@item @code{CSQRT(X)} @tab @code{COMPLEX(4) X} @tab @code{COMPLEX(4)} @tab F95 and later
+@item @code{DSQRT(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab Fortran 95 and later
+@item @code{CSQRT(X)} @tab @code{COMPLEX(4) X} @tab @code{COMPLEX(4)} @tab Fortran 95 and later
@item @code{ZSQRT(X)} @tab @code{COMPLEX(8) X} @tab @code{COMPLEX(8)} @tab GNU extension
@item @code{CDSQRT(X)} @tab @code{COMPLEX(8) X} @tab @code{COMPLEX(8)} @tab GNU extension
@end multitable
@node SRAND
@section @code{SRAND} --- Reinitialize the random number generator
-@cindex @code{SRAND} intrinsic
-@cindex random numbers
+@fnindex SRAND
+@cindex random number generation, seeding
+@cindex seeding a random number generator
@table @asis
@item @emph{Description}:
GNU extension
@item @emph{Class}:
-non-elemental subroutine
+Subroutine
@item @emph{Syntax}:
@code{CALL SRAND(SEED)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{SEED} @tab shall be a scalar @code{INTEGER(kind=4)}.
+@multitable @columnfractions .15 .70
+@item @var{SEED} @tab Shall be a scalar @code{INTEGER(kind=4)}.
@end multitable
@item @emph{Return value}:
-Does not return.
+Does not return anything.
@item @emph{Example}:
See @code{RAND} and @code{IRAND} for examples.
@end table
+
@node STAT
@section @code{STAT} --- Get file status
-@cindex @code{STAT} intrinsic
-@cindex file system operations
+@fnindex STAT
+@cindex file system, file status
@table @asis
@item @emph{Description}:
the file itself, but execute (search) permission is required on all of the
directories in path that lead to the file.
-The elements that are obtained and stored in the array @code{BUFF}:
-@multitable @columnfractions .15 .80
-@item @code{buff(1)} @tab Device ID
-@item @code{buff(2)} @tab Inode number
-@item @code{buff(3)} @tab File mode
-@item @code{buff(4)} @tab Number of links
-@item @code{buff(5)} @tab Owner's uid
-@item @code{buff(6)} @tab Owner's gid
-@item @code{buff(7)} @tab ID of device containing directory entry for file (0 if not available)
-@item @code{buff(8)} @tab File size (bytes)
-@item @code{buff(9)} @tab Last access time
-@item @code{buff(10)} @tab Last modification time
-@item @code{buff(11)} @tab Last file status change time
-@item @code{buff(12)} @tab Preferred I/O block size (-1 if not available)
-@item @code{buff(13)} @tab Number of blocks allocated (-1 if not available)
+The elements that are obtained and stored in the array @code{VALUES}:
+@multitable @columnfractions .15 .70
+@item @code{VALUES(1)} @tab Device ID
+@item @code{VALUES(2)} @tab Inode number
+@item @code{VALUES(3)} @tab File mode
+@item @code{VALUES(4)} @tab Number of links
+@item @code{VALUES(5)} @tab Owner's uid
+@item @code{VALUES(6)} @tab Owner's gid
+@item @code{VALUES(7)} @tab ID of device containing directory entry for file (0 if not available)
+@item @code{VALUES(8)} @tab File size (bytes)
+@item @code{VALUES(9)} @tab Last access time
+@item @code{VALUES(10)} @tab Last modification time
+@item @code{VALUES(11)} @tab Last file status change time
+@item @code{VALUES(12)} @tab Preferred I/O block size (-1 if not available)
+@item @code{VALUES(13)} @tab Number of blocks allocated (-1 if not available)
@end multitable
Not all these elements are relevant on all systems.
If an element is not relevant, it is returned as 0.
+This intrinsic is provided in both subroutine and function forms; however,
+only one form can be used in any given program unit.
@item @emph{Standard}:
GNU extension
@item @emph{Class}:
-Non-elemental subroutine
+Subroutine, function
@item @emph{Syntax}:
-@code{CALL STAT(FILE,BUFF[,STATUS])}
+@code{CALL STAT(NAME, VALUES [, STATUS])}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{FILE} @tab The type shall be @code{CHARACTER(*)}, a valid path within the file system.
-@item @var{BUFF} @tab The type shall be @code{INTEGER(4), DIMENSION(13)}.
+@multitable @columnfractions .15 .70
+@item @var{NAME} @tab The type shall be @code{CHARACTER}, of the
+default kind and a valid path within the file system.
+@item @var{VALUES} @tab The type shall be @code{INTEGER(4), DIMENSION(13)}.
@item @var{STATUS} @tab (Optional) status flag of type @code{INTEGER(4)}. Returns 0
- on success and a system specific error code otherwise.
+on success and a system specific error code otherwise.
@end multitable
@item @emph{Example}:
@node SUM
@section @code{SUM} --- Sum of array elements
-@cindex @code{SUM} intrinsic
-@cindex array manipulation
-
-Intrinsic implemented, documentation pending.
+@fnindex SUM
+@cindex array, sum
+@cindex array, add elements
+@cindex array, conditionally add elements
+@cindex sum array elements
@table @asis
@item @emph{Description}:
+Adds the elements of @var{ARRAY} along dimension @var{DIM} if
+the corresponding element in @var{MASK} is @code{TRUE}.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Transformational function
@item @emph{Syntax}:
+@multitable @columnfractions .80
+@item @code{RESULT = SUM(ARRAY[, MASK])}
+@item @code{RESULT = SUM(ARRAY, DIM[, MASK])}
+@end multitable
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{ARRAY} @tab Shall be an array of type @code{INTEGER},
+@code{REAL} or @code{COMPLEX}.
+@item @var{DIM} @tab (Optional) shall be a scalar of type
+@code{INTEGER} with a value in the range from 1 to n, where n
+equals the rank of @var{ARRAY}.
+@item @var{MASK} @tab (Optional) shall be of type @code{LOGICAL}
+and either be a scalar or an array of the same shape as @var{ARRAY}.
+@end multitable
+
@item @emph{Return value}:
+The result is of the same type as @var{ARRAY}.
+
+If @var{DIM} is absent, a scalar with the sum of all elements in @var{ARRAY}
+is returned. Otherwise, an array of rank n-1, where n equals the rank of
+@var{ARRAY},and a shape similar to that of @var{ARRAY} with dimension @var{DIM}
+dropped is returned.
+
@item @emph{Example}:
+@smallexample
+PROGRAM test_sum
+ INTEGER :: x(5) = (/ 1, 2, 3, 4 ,5 /)
+ print *, SUM(x) ! all elements, sum = 15
+ print *, SUM(x, MASK=MOD(x, 2)==1) ! odd elements, sum = 9
+END PROGRAM
+@end smallexample
+
@item @emph{See also}:
@ref{PRODUCT}
@end table
-
@node SYMLNK
@section @code{SYMLNK} --- Create a symbolic link
-@cindex @code{SYMLNK} intrinsic
-@cindex file system operations
-
-Intrinsic implemented, documentation pending.
+@fnindex SYMLNK
+@cindex file system, create link
+@cindex file system, soft link
@table @asis
@item @emph{Description}:
+Makes a symbolic link from file @var{PATH1} to @var{PATH2}. A null
+character (@code{CHAR(0)}) can be used to mark the end of the names in
+@var{PATH1} and @var{PATH2}; otherwise, trailing blanks in the file
+names are ignored. If the @var{STATUS} argument is supplied, it
+contains 0 on success or a nonzero error code upon return; see
+@code{symlink(2)}. If the system does not supply @code{symlink(2)},
+@code{ENOSYS} is returned.
+
+This intrinsic is provided in both subroutine and function forms;
+however, only one form can be used in any given program unit.
+
@item @emph{Standard}:
-@item @emph{Class}:
GNU extension
+@item @emph{Class}:
+Subroutine, function
+
@item @emph{Syntax}:
+@multitable @columnfractions .80
+@item @code{CALL SYMLNK(PATH1, PATH2 [, STATUS])}
+@item @code{STATUS = SYMLNK(PATH1, PATH2)}
+@end multitable
+
@item @emph{Arguments}:
-@item @emph{Return value}:
-@item @emph{Example}:
+@multitable @columnfractions .15 .70
+@item @var{PATH1} @tab Shall be of default @code{CHARACTER} type.
+@item @var{PATH2} @tab Shall be of default @code{CHARACTER} type.
+@item @var{STATUS} @tab (Optional) Shall be of default @code{INTEGER} type.
+@end multitable
+
@item @emph{See also}:
-@end table
+@ref{LINK}, @ref{UNLINK}
+@end table
@node SYSTEM
@section @code{SYSTEM} --- Execute a shell command
-@cindex @code{SYSTEM} intrinsic
-@cindex undocumented intrinsic
-
-Intrinsic implemented, documentation pending.
+@fnindex SYSTEM
+@cindex system, system call
@table @asis
@item @emph{Description}:
+Passes the command @var{COMMAND} to a shell (see @code{system(3)}). If
+argument @var{STATUS} is present, it contains the value returned by
+@code{system(3)}, which is presumably 0 if the shell command succeeded.
+Note that which shell is used to invoke the command is system-dependent
+and environment-dependent.
+
+This intrinsic is provided in both subroutine and function forms;
+however, only one form can be used in any given program unit.
+
@item @emph{Standard}:
GNU extension
@item @emph{Class}:
-Subroutine
+Subroutine, function
@item @emph{Syntax}:
+@multitable @columnfractions .80
+@item @code{CALL SYSTEM(COMMAND [, STATUS])}
+@item @code{STATUS = SYSTEM(COMMAND)}
+@end multitable
+
@item @emph{Arguments}:
-@item @emph{Return value}:
-@item @emph{Example}:
+@multitable @columnfractions .15 .70
+@item @var{COMMAND} @tab Shall be of default @code{CHARACTER} type.
+@item @var{STATUS} @tab (Optional) Shall be of default @code{INTEGER} type.
+@end multitable
+
@item @emph{See also}:
@end table
-
@node SYSTEM_CLOCK
@section @code{SYSTEM_CLOCK} --- Time function
-@cindex @code{SYSTEM_CLOCK} intrinsic
-@cindex time, current
-@cindex current time
-
-Intrinsic implemented, documentation pending.
+@fnindex SYSTEM_CLOCK
+@cindex time, clock ticks
+@cindex clock ticks
@table @asis
@item @emph{Description}:
+Determines the @var{COUNT} of milliseconds of wall clock time since
+the Epoch (00:00:00 UTC, January 1, 1970) modulo @var{COUNT_MAX},
+@var{COUNT_RATE} determines the number of clock ticks per second.
+@var{COUNT_RATE} and @var{COUNT_MAX} are constant and specific to
+@command{gfortran}.
+
+If there is no clock, @var{COUNT} is set to @code{-HUGE(COUNT)}, and
+@var{COUNT_RATE} and @var{COUNT_MAX} are set to zero
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Subroutine
@item @emph{Syntax}:
+@code{CALL SYSTEM_CLOCK([COUNT, COUNT_RATE, COUNT_MAX])}
+
@item @emph{Arguments}:
-@item @emph{Return value}:
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{COUNT} @tab (Optional) shall be a scalar of type default
+@code{INTEGER} with @code{INTENT(OUT)}.
+@item @var{COUNT_RATE} @tab (Optional) shall be a scalar of type default
+@code{INTEGER} with @code{INTENT(OUT)}.
+@item @var{COUNT_MAX} @tab (Optional) shall be a scalar of type default
+@code{INTEGER} with @code{INTENT(OUT)}.
+@end multitable
+
@item @emph{Example}:
+@smallexample
+PROGRAM test_system_clock
+ INTEGER :: count, count_rate, count_max
+ CALL SYSTEM_CLOCK(count, count_rate, count_max)
+ WRITE(*,*) count, count_rate, count_max
+END PROGRAM
+@end smallexample
+
@item @emph{See also}:
+@ref{DATE_AND_TIME}, @ref{CPU_TIME}
@end table
@node TAN
@section @code{TAN} --- Tangent function
-@cindex @code{TAN} intrinsic
-@cindex @code{DTAN} intrinsic
-@cindex trigonometric functions
+@fnindex TAN
+@fnindex DTAN
+@cindex trigonometric function, tangent
+@cindex tangent
@table @asis
@item @emph{Description}:
@code{TAN(X)} computes the tangent of @var{X}.
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later, for a complex argument Fortran 2008 or later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
-@code{X = TAN(X)}
+@code{RESULT = TAN(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)}.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be @code{REAL} or @code{COMPLEX}.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{REAL(*)}. The kind type parameter is
-the same as @var{X}.
+The return value has same type and kind as @var{X}.
@item @emph{Example}:
@smallexample
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
-@item @code{DTAN(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab F95 and later
+@item @code{DTAN(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab Fortran 95 and later
@end multitable
@item @emph{See also}:
@node TANH
@section @code{TANH} --- Hyperbolic tangent function
-@cindex @code{TANH} intrinsic
-@cindex @code{DTANH} intrinsic
+@fnindex TANH
+@fnindex DTANH
@cindex hyperbolic tangent
+@cindex hyperbolic function, tangent
+@cindex tangent, hyperbolic
@table @asis
@item @emph{Description}:
@code{TANH(X)} computes the hyperbolic tangent of @var{X}.
@item @emph{Standard}:
-F77 and later
+Fortran 77 and later, for a complex argument Fortran 2008 or later
@item @emph{Class}:
Elemental function
@code{X = TANH(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be @code{REAL(*)}.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab The type shall be @code{REAL} or @code{COMPLEX}.
@end multitable
@item @emph{Return value}:
-The return value is of type @code{REAL(*)} and lies in the range
+The return value has same type and kind as @var{X}. If @var{X} is
+complex, the imaginary part of the result is in radians. If @var{X}
+is @code{REAL}, the return value lies in the range
@math{ - 1 \leq tanh(x) \leq 1 }.
@item @emph{Example}:
@end smallexample
@item @emph{Specific names}:
-@multitable @columnfractions .20 .20 .20 .40
+@multitable @columnfractions .20 .20 .20 .25
@item Name @tab Argument @tab Return type @tab Standard
-@item @code{DTANH(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab F95 and later
+@item @code{DTANH(X)} @tab @code{REAL(8) X} @tab @code{REAL(8)} @tab Fortran 95 and later
@end multitable
@item @emph{See also}:
@node TIME
@section @code{TIME} --- Time function
-@cindex @code{TIME} intrinsic
+@fnindex TIME
@cindex time, current
@cindex current time
-Intrinsic implemented, documentation pending.
+@table @asis
+@item @emph{Description}:
+Returns the current time encoded as an integer (in the manner of the
+UNIX function @code{time(3)}). This value is suitable for passing to
+@code{CTIME()}, @code{GMTIME()}, and @code{LTIME()}.
+
+This intrinsic is not fully portable, such as to systems with 32-bit
+@code{INTEGER} types but supporting times wider than 32 bits. Therefore,
+the values returned by this intrinsic might be, or become, negative, or
+numerically less than previous values, during a single run of the
+compiled program.
+
+See @ref{TIME8}, for information on a similar intrinsic that might be
+portable to more GNU Fortran implementations, though to fewer Fortran
+compilers.
+
+@item @emph{Standard}:
+GNU extension
+
+@item @emph{Class}:
+Function
+
+@item @emph{Syntax}:
+@code{RESULT = TIME()}
+
+@item @emph{Return value}:
+The return value is a scalar of type @code{INTEGER(4)}.
+
+@item @emph{See also}:
+@ref{CTIME}, @ref{GMTIME}, @ref{LTIME}, @ref{MCLOCK}, @ref{TIME8}
+
+@end table
+
+
+
+@node TIME8
+@section @code{TIME8} --- Time function (64-bit)
+@fnindex TIME8
+@cindex time, current
+@cindex current time
@table @asis
@item @emph{Description}:
+Returns the current time encoded as an integer (in the manner of the
+UNIX function @code{time(3)}). This value is suitable for passing to
+@code{CTIME()}, @code{GMTIME()}, and @code{LTIME()}.
+
+@emph{Warning:} this intrinsic does not increase the range of the timing
+values over that returned by @code{time(3)}. On a system with a 32-bit
+@code{time(3)}, @code{TIME8()} will return a 32-bit value, even though
+it is converted to a 64-bit @code{INTEGER(8)} value. That means
+overflows of the 32-bit value can still occur. Therefore, the values
+returned by this intrinsic might be or become negative or numerically
+less than previous values during a single run of the compiled program.
+
@item @emph{Standard}:
GNU extension
@item @emph{Class}:
-Non-elemental function
+Function
@item @emph{Syntax}:
-@item @emph{Arguments}:
+@code{RESULT = TIME8()}
+
@item @emph{Return value}:
-@item @emph{Example}:
+The return value is a scalar of type @code{INTEGER(8)}.
+
@item @emph{See also}:
+@ref{CTIME}, @ref{GMTIME}, @ref{LTIME}, @ref{MCLOCK8}, @ref{TIME}
+
@end table
@node TINY
@section @code{TINY} --- Smallest positive number of a real kind
-@cindex @code{TINY} intrinsic
-@cindex tiny
+@fnindex TINY
+@cindex limits, smallest number
+@cindex model representation, smallest number
@table @asis
@item @emph{Description}:
in the model of the type of @code{X}.
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
-Elemental function
+Inquiry function
@item @emph{Syntax}:
-@code{Y = TINY(X)}
+@code{RESULT = TINY(X)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab shall be of type @code{REAL}.
+@multitable @columnfractions .15 .70
+@item @var{X} @tab Shall be of type @code{REAL}.
@end multitable
@item @emph{Return value}:
+@node TRAILZ
+@section @code{TRAILZ} --- Number of trailing zero bits of an integer
+@fnindex TRAILZ
+@cindex zero bits
+
+@table @asis
+@item @emph{Description}:
+@code{TRAILZ} returns the number of trailing zero bits of an integer.
+
+@item @emph{Standard}:
+Fortran 2008 and later
+
+@item @emph{Class}:
+Elemental function
+
+@item @emph{Syntax}:
+@code{RESULT = TRAILZ(I)}
+
+@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{I} @tab Shall be of type @code{INTEGER}.
+@end multitable
+
+@item @emph{Return value}:
+The type of the return value is the default @code{INTEGER}.
+If all the bits of @code{I} are zero, the result value is @code{BIT_SIZE(I)}.
+
+@item @emph{Example}:
+@smallexample
+PROGRAM test_trailz
+ WRITE (*,*) TRAILZ(8) ! prints 3
+END PROGRAM
+@end smallexample
+
+@item @emph{See also}:
+@ref{BIT_SIZE}, @ref{LEADZ}
+@end table
+
+
+
@node TRANSFER
@section @code{TRANSFER} --- Transfer bit patterns
-@cindex @code{TRANSFER} intrinsic
-@cindex bit operations
-
-Intrinsic implemented, documentation pending.
+@fnindex TRANSFER
+@cindex bits, move
+@cindex type cast
@table @asis
@item @emph{Description}:
+Interprets the bitwise representation of @var{SOURCE} in memory as if it
+is the representation of a variable or array of the same type and type
+parameters as @var{MOLD}.
+
+This is approximately equivalent to the C concept of @emph{casting} one
+type to another.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Transformational function
@item @emph{Syntax}:
+@code{RESULT = TRANSFER(SOURCE, MOLD[, SIZE])}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{SOURCE} @tab Shall be a scalar or an array of any type.
+@item @var{MOLD} @tab Shall be a scalar or an array of any type.
+@item @var{SIZE} @tab (Optional) shall be a scalar of type
+@code{INTEGER}.
+@end multitable
+
@item @emph{Return value}:
+The result has the same type as @var{MOLD}, with the bit level
+representation of @var{SOURCE}. If @var{SIZE} is present, the result is
+a one-dimensional array of length @var{SIZE}. If @var{SIZE} is absent
+but @var{MOLD} is an array (of any size or shape), the result is a one-
+dimensional array of the minimum length needed to contain the entirety
+of the bitwise representation of @var{SOURCE}. If @var{SIZE} is absent
+and @var{MOLD} is a scalar, the result is a scalar.
+
+If the bitwise representation of the result is longer than that of
+@var{SOURCE}, then the leading bits of the result correspond to those of
+@var{SOURCE} and any trailing bits are filled arbitrarily.
+
+When the resulting bit representation does not correspond to a valid
+representation of a variable of the same type as @var{MOLD}, the results
+are undefined, and subsequent operations on the result cannot be
+guaranteed to produce sensible behavior. For example, it is possible to
+create @code{LOGICAL} variables for which @code{@var{VAR}} and
+@code{.NOT.@var{VAR}} both appear to be true.
+
@item @emph{Example}:
-@item @emph{See also}:
+@smallexample
+PROGRAM test_transfer
+ integer :: x = 2143289344
+ print *, transfer(x, 1.0) ! prints "NaN" on i686
+END PROGRAM
+@end smallexample
@end table
-
@node TRANSPOSE
@section @code{TRANSPOSE} --- Transpose an array of rank two
-@cindex @code{TRANSPOSE} intrinsic
-@cindex matrix manipulation
-
-Intrinsic implemented, documentation pending.
+@fnindex TRANSPOSE
+@cindex array, transpose
+@cindex matrix, transpose
+@cindex transpose
@table @asis
@item @emph{Description}:
+Transpose an array of rank two. Element (i, j) of the result has the value
+@code{MATRIX(j, i)}, for all i, j.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Transformational function
@item @emph{Syntax}:
+@code{RESULT = TRANSPOSE(MATRIX)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{MATRIX} @tab Shall be an array of any type and have a rank of two.
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
-@item @emph{See also}:
+The result has the same type as @var{MATRIX}, and has shape
+@code{(/ m, n /)} if @var{MATRIX} has shape @code{(/ n, m /)}.
@end table
-
@node TRIM
-@section @code{TRIM} --- Function to remove trailing blank characters of a string
-@cindex @code{TRIM} intrinsic
-@cindex string manipulation
-
-Intrinsic implemented, documentation pending.
+@section @code{TRIM} --- Remove trailing blank characters of a string
+@fnindex TRIM
+@cindex string, remove trailing whitespace
@table @asis
@item @emph{Description}:
+Removes trailing blank characters of a string.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Transformational function
@item @emph{Syntax}:
+@code{RESULT = TRIM(STRING)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{STRING} @tab Shall be a scalar of type @code{CHARACTER}.
+@end multitable
+
@item @emph{Return value}:
+A scalar of type @code{CHARACTER} which length is that of @var{STRING}
+less the number of trailing blanks.
+
@item @emph{Example}:
+@smallexample
+PROGRAM test_trim
+ CHARACTER(len=10), PARAMETER :: s = "GFORTRAN "
+ WRITE(*,*) LEN(s), LEN(TRIM(s)) ! "10 8", with/without trailing blanks
+END PROGRAM
+@end smallexample
+
@item @emph{See also}:
+@ref{ADJUSTL}, @ref{ADJUSTR}
@end table
-
-@node UBOUND
-@section @code{UBOUND} --- Upper dimension bounds of an array
-@cindex @code{UBOUND} intrinsic
-@cindex undocumented intrinsic
-
-Intrinsic implemented, documentation pending.
+@node TTYNAM
+@section @code{TTYNAM} --- Get the name of a terminal device.
+@fnindex TTYNAM
+@cindex system, terminal
@table @asis
@item @emph{Description}:
+Get the name of a terminal device. For more information,
+see @code{ttyname(3)}.
+
+This intrinsic is provided in both subroutine and function forms;
+however, only one form can be used in any given program unit.
@item @emph{Standard}:
-F95 and later
+GNU extension
@item @emph{Class}:
-Inquiry function
+Subroutine, function
@item @emph{Syntax}:
+@multitable @columnfractions .80
+@item @code{CALL TTYNAM(UNIT, NAME)}
+@item @code{NAME = TTYNAM(UNIT)}
+@end multitable
+
@item @emph{Arguments}:
-@item @emph{Return value}:
+@multitable @columnfractions .15 .70
+@item @var{UNIT} @tab Shall be a scalar @code{INTEGER}.
+@item @var{NAME} @tab Shall be of type @code{CHARACTER}.
+@end multitable
+
@item @emph{Example}:
-@item @emph{Specific names}:
+@smallexample
+PROGRAM test_ttynam
+ INTEGER :: unit
+ DO unit = 1, 10
+ IF (isatty(unit=unit)) write(*,*) ttynam(unit)
+ END DO
+END PROGRAM
+@end smallexample
@item @emph{See also}:
-@ref{LBOUND}
+@ref{ISATTY}
@end table
-
-@node UMASK
-@section @code{UMASK} --- Set the file creation mask
-@cindex @code{UMASK} intrinsic
-@cindex file system operations
-
-Intrinsic implemented, documentation pending.
+@node UBOUND
+@section @code{UBOUND} --- Upper dimension bounds of an array
+@fnindex UBOUND
+@cindex array, upper bound
@table @asis
@item @emph{Description}:
+Returns the upper bounds of an array, or a single upper bound
+along the @var{DIM} dimension.
@item @emph{Standard}:
-GNU extension
+Fortran 95 and later, with @var{KIND} argument Fortran 2003 and later
@item @emph{Class}:
-Subroutine
+Inquiry function
@item @emph{Syntax}:
+@code{RESULT = UBOUND(ARRAY [, DIM [, KIND]])}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{ARRAY} @tab Shall be an array, of any type.
+@item @var{DIM} @tab (Optional) Shall be a scalar @code{INTEGER}.
+@item @var{KIND}@tab (Optional) An @code{INTEGER} initialization
+expression indicating the kind parameter of the result.
+@end multitable
+
@item @emph{Return value}:
-@item @emph{Example}:
-@item @emph{Specific names}:
+The return value is of type @code{INTEGER} and of kind @var{KIND}. If
+@var{KIND} is absent, the return value is of default integer kind.
+If @var{DIM} is absent, the result is an array of the upper bounds of
+@var{ARRAY}. If @var{DIM} is present, the result is a scalar
+corresponding to the upper bound of the array along that dimension. If
+@var{ARRAY} is an expression rather than a whole array or array
+structure component, or if it has a zero extent along the relevant
+dimension, the upper bound is taken to be the number of elements along
+the relevant dimension.
+
@item @emph{See also}:
+@ref{LBOUND}
@end table
-
-@node UNLINK
-@section @code{UNLINK} --- Remove a file from the file system
-@cindex @code{UNLINK} intrinsic
-@cindex file system operations
-
-Intrinsic implemented, documentation pending.
+@node UMASK
+@section @code{UMASK} --- Set the file creation mask
+@fnindex UMASK
+@cindex file system, file creation mask
@table @asis
@item @emph{Description}:
+Sets the file creation mask to @var{MASK}. If called as a function, it
+returns the old value. If called as a subroutine and argument @var{OLD}
+if it is supplied, it is set to the old value. See @code{umask(2)}.
+
@item @emph{Standard}:
GNU extension
@item @emph{Class}:
-Subroutine
+Subroutine, function
@item @emph{Syntax}:
+@code{CALL UMASK(MASK [, OLD])}
+@code{OLD = UMASK(MASK)}
+
@item @emph{Arguments}:
-@item @emph{Return value}:
-@item @emph{Example}:
+@multitable @columnfractions .15 .70
+@item @var{MASK} @tab Shall be a scalar of type @code{INTEGER}.
+@item @var{OLD} @tab (Optional) Shall be a scalar of type
+@code{INTEGER}.
+@end multitable
-@item @emph{See also}:
-@ref{LINK}
@end table
-
-@node UNMASK
-@section @code{UNMASK} --- (?)
-@cindex @code{UNMASK} intrinsic
-@cindex undocumented intrinsic
-
-Intrinsic implemented, documentation pending.
+@node UNLINK
+@section @code{UNLINK} --- Remove a file from the file system
+@fnindex UNLINK
+@cindex file system, remove file
@table @asis
@item @emph{Description}:
+Unlinks the file @var{PATH}. A null character (@code{CHAR(0)}) can be
+used to mark the end of the name in @var{PATH}; otherwise, trailing
+blanks in the file name are ignored. If the @var{STATUS} argument is
+supplied, it contains 0 on success or a nonzero error code upon return;
+see @code{unlink(2)}.
+
+This intrinsic is provided in both subroutine and function forms;
+however, only one form can be used in any given program unit.
+
@item @emph{Standard}:
+GNU extension
+
@item @emph{Class}:
+Subroutine, function
+
@item @emph{Syntax}:
+@multitable @columnfractions .80
+@item @code{CALL UNLINK(PATH [, STATUS])}
+@item @code{STATUS = UNLINK(PATH)}
+@end multitable
+
@item @emph{Arguments}:
-@item @emph{Return value}:
-@item @emph{Example}:
-@item @emph{Specific names}:
+@multitable @columnfractions .15 .70
+@item @var{PATH} @tab Shall be of default @code{CHARACTER} type.
+@item @var{STATUS} @tab (Optional) Shall be of default @code{INTEGER} type.
+@end multitable
+
@item @emph{See also}:
+@ref{LINK}, @ref{SYMLNK}
@end table
-
@node UNPACK
@section @code{UNPACK} --- Unpack an array of rank one into an array
-@cindex @code{UNPACK} intrinsic
-@cindex array manipulation
-
-Intrinsic implemented, documentation pending.
+@fnindex UNPACK
+@cindex array, unpacking
+@cindex array, increase dimension
+@cindex array, scatter elements
@table @asis
@item @emph{Description}:
+Store the elements of @var{VECTOR} in an array of higher rank.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later
@item @emph{Class}:
Transformational function
@item @emph{Syntax}:
+@code{RESULT = UNPACK(VECTOR, MASK, FIELD)}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{VECTOR} @tab Shall be an array of any type and rank one. It
+shall have at least as many elements as @var{MASK} has @code{TRUE} values.
+@item @var{MASK} @tab Shall be an array of type @code{LOGICAL}.
+@item @var{FIELD} @tab Shall be of the same type as @var{VECTOR} and have
+the same shape as @var{MASK}.
+@end multitable
+
@item @emph{Return value}:
+The resulting array corresponds to @var{FIELD} with @code{TRUE} elements
+of @var{MASK} replaced by values from @var{VECTOR} in array element order.
+
@item @emph{Example}:
+@smallexample
+PROGRAM test_unpack
+ integer :: vector(2) = (/1,1/)
+ logical :: mask(4) = (/ .TRUE., .FALSE., .FALSE., .TRUE. /)
+ integer :: field(2,2) = 0, unity(2,2)
+
+ ! result: unity matrix
+ unity = unpack(vector, reshape(mask, (/2,2/)), field)
+END PROGRAM
+@end smallexample
@item @emph{See also}:
-@ref{PACK}
+@ref{PACK}, @ref{SPREAD}
@end table
-
@node VERIFY
@section @code{VERIFY} --- Scan a string for the absence of a set of characters
-@cindex @code{VERIFY} intrinsic
-@cindex string manipulation
-
-Intrinsic implemented, documentation pending.
+@fnindex VERIFY
+@cindex string, find missing set
@table @asis
@item @emph{Description}:
+Verifies that all the characters in a @var{SET} are present in a @var{STRING}.
+
+If @var{BACK} is either absent or equals @code{FALSE}, this function
+returns the position of the leftmost character of @var{STRING} that is
+not in @var{SET}. If @var{BACK} equals @code{TRUE}, the rightmost position
+is returned. If all characters of @var{SET} are found in @var{STRING}, the
+result is zero.
+
@item @emph{Standard}:
-F95 and later
+Fortran 95 and later, with @var{KIND} argument Fortran 2003 and later
@item @emph{Class}:
Elemental function
@item @emph{Syntax}:
+@code{RESULT = VERIFY(STRING, SET[, BACK [, KIND]])}
+
@item @emph{Arguments}:
+@multitable @columnfractions .15 .70
+@item @var{STRING} @tab Shall be of type @code{CHARACTER}.
+@item @var{SET} @tab Shall be of type @code{CHARACTER}.
+@item @var{BACK} @tab (Optional) shall be of type @code{LOGICAL}.
+@item @var{KIND} @tab (Optional) An @code{INTEGER} initialization
+expression indicating the kind parameter of the result.
+@end multitable
+
@item @emph{Return value}:
+The return value is of type @code{INTEGER} and of kind @var{KIND}. If
+@var{KIND} is absent, the return value is of default integer kind.
+
@item @emph{Example}:
-@item @emph{Specific names}:
+@smallexample
+PROGRAM test_verify
+ WRITE(*,*) VERIFY("FORTRAN", "AO") ! 1, found 'F'
+ WRITE(*,*) VERIFY("FORTRAN", "FOO") ! 3, found 'R'
+ WRITE(*,*) VERIFY("FORTRAN", "C++") ! 1, found 'F'
+ WRITE(*,*) VERIFY("FORTRAN", "C++", .TRUE.) ! 7, found 'N'
+ WRITE(*,*) VERIFY("FORTRAN", "FORTRAN") ! 0' found none
+END PROGRAM
+@end smallexample
+
@item @emph{See also}:
+@ref{SCAN}, @ref{INDEX intrinsic}
@end table
+
@node XOR
@section @code{XOR} --- Bitwise logical exclusive OR
-@cindex @code{XOR} intrinsic
-@cindex bit operations
+@fnindex XOR
+@cindex bitwise logical exclusive or
+@cindex logical exclusive or, bitwise
@table @asis
@item @emph{Description}:
This intrinsic routine is provided for backwards compatibility with
GNU Fortran 77. For integer arguments, programmers should consider
-the use of the @ref{IEOR} intrinsic defined by the Fortran standard.
+the use of the @ref{IEOR} intrinsic and for logical arguments the
+@code{.NEQV.} operator, which are both defined by the Fortran standard.
@item @emph{Standard}:
GNU extension
@item @emph{Class}:
-Non-elemental function
+Function
@item @emph{Syntax}:
-@code{RESULT = XOR(X, Y)}
+@code{RESULT = XOR(I, J)}
@item @emph{Arguments}:
-@multitable @columnfractions .15 .80
-@item @var{X} @tab The type shall be either @code{INTEGER(*)} or @code{LOGICAL}.
-@item @var{Y} @tab The type shall be either @code{INTEGER(*)} or @code{LOGICAL}.
+@multitable @columnfractions .15 .70
+@item @var{I} @tab The type shall be either a scalar @code{INTEGER}
+type or a scalar @code{LOGICAL} type.
+@item @var{J} @tab The type shall be the same as the type of @var{I}.
@end multitable
@item @emph{Return value}:
-The return type is either @code{INTEGER(*)} or @code{LOGICAL}
-after cross-promotion of the arguments.
+The return type is either a scalar @code{INTEGER} or a scalar
+@code{LOGICAL}. If the kind type parameters differ, then the
+smaller kind type is implicitly converted to larger kind, and the
+return has the larger kind.
@item @emph{Example}:
@smallexample
PROGRAM test_xor
LOGICAL :: T = .TRUE., F = .FALSE.
INTEGER :: a, b
- DATA a / Z,'F' /, b / Z'3' /
+ DATA a / Z'F' /, b / Z'3' /
WRITE (*,*) XOR(T, T), XOR(T, F), XOR(F, T), XOR(F, F)
WRITE (*,*) XOR(a, b)
@end smallexample
@item @emph{See also}:
-F95 elemental function: @ref{IEOR}
+Fortran 95 elemental function: @ref{IEOR}
+@end table
+
+
+
+@node Intrinsic Modules
+@chapter Intrinsic Modules
+@cindex intrinsic Modules
+
+@menu
+* ISO_FORTRAN_ENV::
+* ISO_C_BINDING::
+* OpenMP Modules OMP_LIB and OMP_LIB_KINDS::
+@end menu
+
+@node ISO_FORTRAN_ENV
+@section @code{ISO_FORTRAN_ENV}
+@table @asis
+@item @emph{Standard}:
+Fortran 2003 and later; @code{INT8}, @code{INT16}, @code{INT32}, @code{INT64},
+@code{REAL32}, @code{REAL64}, @code{REAL128} are Fortran 2008 or later
+@end table
+
+The @code{ISO_FORTRAN_ENV} module provides the following scalar default-integer
+named constants:
+
+@table @asis
+@item @code{CHARACTER_STORAGE_SIZE}:
+Size in bits of the character storage unit.
+
+@item @code{ERROR_UNIT}:
+Identifies the preconnected unit used for error reporting.
+
+@item @code{FILE_STORAGE_SIZE}:
+Size in bits of the file-storage unit.
+
+@item @code{INPUT_UNIT}:
+Identifies the preconnected unit identified by the asterisk
+(@code{*}) in @code{READ} statement.
+
+@item @code{INT8}, @code{INT16}, @code{INT32}, @code{INT64}
+Kind type parameters to specify an INTEGER type with a storage
+size of 16, 32, and 64 bits. It is negative if a target platform
+does not support the particular kind.
+
+@item @code{IOSTAT_END}:
+The value assigned to the variable passed to the IOSTAT= specifier of
+an input/output statement if an end-of-file condition occurred.
+
+@item @code{IOSTAT_EOR}:
+The value assigned to the variable passed to the IOSTAT= specifier of
+an input/output statement if an end-of-record condition occurred.
+
+@item @code{NUMERIC_STORAGE_SIZE}:
+The size in bits of the numeric storage unit.
+
+@item @code{OUTPUT_UNIT}:
+Identifies the preconnected unit identified by the asterisk
+(@code{*}) in @code{WRITE} statement.
+
+@item @code{REAL32}, @code{REAL64}, @code{REAL128}
+Kind type parameters to specify a REAL type with a storage
+size of 32, 64, and 128 bits. It is negative if a target platform
+does not support the particular kind.
+@end table
+
+
+
+@node ISO_C_BINDING
+@section @code{ISO_C_BINDING}
+@table @asis
+@item @emph{Standard}:
+Fortran 2003 and later, GNU extensions
+@end table
+
+The following intrinsic procedures are provided by the module; their
+definition can be found in the section Intrinsic Procedures of this
+manual.
+
+@table @asis
+@item @code{C_ASSOCIATED}
+@item @code{C_F_POINTER}
+@item @code{C_F_PROCPOINTER}
+@item @code{C_FUNLOC}
+@item @code{C_LOC}
+@end table
+@c TODO: Vertical spacing between C_FUNLOC and C_LOC wrong in PDF,
+@c don't really know why.
+
+The @code{ISO_C_BINDING} module provides the following named constants of
+type default integer, which can be used as KIND type parameters.
+
+In addition to the integer named constants required by the Fortran 2003
+standard, GNU Fortran provides as an extension named constants for the
+128-bit integer types supported by the C compiler: @code{C_INT128_T,
+C_INT_LEAST128_T, C_INT_FAST128_T}.
+
+@multitable @columnfractions .15 .35 .35 .35
+@item Fortran Type @tab Named constant @tab C type @tab Extension
+@item @code{INTEGER}@tab @code{C_INT} @tab @code{int}
+@item @code{INTEGER}@tab @code{C_SHORT} @tab @code{short int}
+@item @code{INTEGER}@tab @code{C_LONG} @tab @code{long int}
+@item @code{INTEGER}@tab @code{C_LONG_LONG} @tab @code{long long int}
+@item @code{INTEGER}@tab @code{C_SIGNED_CHAR} @tab @code{signed char}/@code{unsigned char}
+@item @code{INTEGER}@tab @code{C_SIZE_T} @tab @code{size_t}
+@item @code{INTEGER}@tab @code{C_INT8_T} @tab @code{int8_t}
+@item @code{INTEGER}@tab @code{C_INT16_T} @tab @code{int16_t}
+@item @code{INTEGER}@tab @code{C_INT32_T} @tab @code{int32_t}
+@item @code{INTEGER}@tab @code{C_INT64_T} @tab @code{int64_t}
+@item @code{INTEGER}@tab @code{C_INT128_T} @tab @code{int128_t} @tab Ext.
+@item @code{INTEGER}@tab @code{C_INT_LEAST8_T} @tab @code{int_least8_t}
+@item @code{INTEGER}@tab @code{C_INT_LEAST16_T} @tab @code{int_least16_t}
+@item @code{INTEGER}@tab @code{C_INT_LEAST32_T} @tab @code{int_least32_t}
+@item @code{INTEGER}@tab @code{C_INT_LEAST64_T} @tab @code{int_least64_t}
+@item @code{INTEGER}@tab @code{C_INT_LEAST128_T}@tab @code{int_least128_t} @tab Ext.
+@item @code{INTEGER}@tab @code{C_INT_FAST8_T} @tab @code{int_fast8_t}
+@item @code{INTEGER}@tab @code{C_INT_FAST16_T} @tab @code{int_fast16_t}
+@item @code{INTEGER}@tab @code{C_INT_FAST32_T} @tab @code{int_fast32_t}
+@item @code{INTEGER}@tab @code{C_INT_FAST64_T} @tab @code{int_fast64_t}
+@item @code{INTEGER}@tab @code{C_INT_FAST128_T} @tab @code{int_fast128_t} @tab Ext.
+@item @code{INTEGER}@tab @code{C_INTMAX_T} @tab @code{intmax_t}
+@item @code{INTEGER}@tab @code{C_INTPTR_T} @tab @code{intptr_t}
+@item @code{REAL} @tab @code{C_FLOAT} @tab @code{float}
+@item @code{REAL} @tab @code{C_DOUBLE} @tab @code{double}
+@item @code{REAL} @tab @code{C_LONG_DOUBLE} @tab @code{long double}
+@item @code{COMPLEX}@tab @code{C_FLOAT_COMPLEX} @tab @code{float _Complex}
+@item @code{COMPLEX}@tab @code{C_DOUBLE_COMPLEX}@tab @code{double _Complex}
+@item @code{COMPLEX}@tab @code{C_LONG_DOUBLE_COMPLEX}@tab @code{long double _Complex}
+@item @code{LOGICAL}@tab @code{C_BOOL} @tab @code{_Bool}
+@item @code{CHARACTER}@tab @code{C_CHAR} @tab @code{char}
+@end multitable
+
+Additionally, the following @code{(CHARACTER(KIND=C_CHAR))} are
+defined.
+
+@multitable @columnfractions .20 .45 .15
+@item Name @tab C definition @tab Value
+@item @code{C_NULL_CHAR} @tab null character @tab @code{'\0'}
+@item @code{C_ALERT} @tab alert @tab @code{'\a'}
+@item @code{C_BACKSPACE} @tab backspace @tab @code{'\b'}
+@item @code{C_FORM_FEED} @tab form feed @tab @code{'\f'}
+@item @code{C_NEW_LINE} @tab new line @tab @code{'\n'}
+@item @code{C_CARRIAGE_RETURN} @tab carriage return @tab @code{'\r'}
+@item @code{C_HORIZONTAL_TAB} @tab horizontal tab @tab @code{'\t'}
+@item @code{C_VERTICAL_TAB} @tab vertical tab @tab @code{'\v'}
+@end multitable
+
+@node OpenMP Modules OMP_LIB and OMP_LIB_KINDS
+@section OpenMP Modules @code{OMP_LIB} and @code{OMP_LIB_KINDS}
+@table @asis
+@item @emph{Standard}:
+OpenMP Application Program Interface v3.0
@end table
+The OpenMP Fortran runtime library routines are provided both in
+a form of two Fortran 90 modules, named @code{OMP_LIB} and
+@code{OMP_LIB_KINDS}, and in a form of a Fortran @code{include} file named
+@file{omp_lib.h}. The procedures provided by @code{OMP_LIB} can be found
+in the @ref{Top,,Introduction,libgomp,GNU OpenMP runtime library} manual,
+the named constants defined in the @code{OMP_LIB_KINDS} module are listed
+below.
+
+For details refer to the actual
+@uref{http://www.openmp.org/mp-documents/spec30.pdf,
+OpenMP Application Program Interface v3.0}.
+
+@code{OMP_LIB_KINDS} provides the following scalar default-integer
+named constants:
+
+@table @asis
+@item @code{omp_integer_kind}
+@item @code{omp_logical_kind}
+@item @code{omp_lock_kind}
+@item @code{omp_nest_lock_kind}
+@item @code{omp_sched_kind}
+@end table
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