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
print '(8i5))', values
end program test_time_and_date
@end smallexample
+
+@item @emph{See also}:
+@ref{CPU_TIME}, @ref{SYSTEM_CLOCK}
@end table
@node PRODUCT
@section @code{PRODUCT} --- Product of array elements
@cindex @code{PRODUCT} intrinsic
-@cindex undocumented intrinsic
-
-Intrinsic implemented, documentation pending.
+@cindex array operation
@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
Transformational function
@item @emph{Syntax}:
+@code{RESULT = PRODUCT(ARRAY[, MASK])}
+@code{RESULT = PRODUCT(ARRAY, DIM[, MASK])}
+
@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
@cindex @code{RESHAPE} intrinsic
@cindex array manipulation
-Intrinsic implemented, documentation pending.
-
@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
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}, @ref{SIZE}
+@ref{SHAPE}
@end table
The value returned is equal to
@code{ABS(FRACTION(X)) * FLOAT(RADIX(X))**DIGITS(X)}.
+@item @emph{See also}:
+@ref{SPACING}
@end table
@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 extent
+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.
@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.
@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
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
@cindex @code{SPREAD} intrinsic
@cindex array manipulation
-Intrinsic implemented, documentation pending.
-
@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
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 SUM
@section @code{SUM} --- Sum of array elements
@cindex @code{SUM} intrinsic
-@cindex array manipulation
-
-Intrinsic implemented, documentation pending.
+@cindex array operation
@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
Transformational function
@item @emph{Syntax}:
+@code{RESULT = SUM(ARRAY[, MASK])}
+@code{RESULT = SUM(ARRAY, DIM[, MASK])}
+
@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
@cindex time, current
@cindex current time
-Intrinsic implemented, documentation pending.
-
@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
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 TRANSFER
@section @code{TRANSFER} --- Transfer bit patterns
@cindex @code{TRANSFER} intrinsic
-@cindex bit operations
-
-Intrinsic implemented, documentation pending.
+@cindex type cast
@table @asis
@item @emph{Description}:
+Interprets the bit pattern of @var{SOURCE} as a variable of the
+same type and type parameters as @var{MOLD}.
+
+This is also known as @emph{casting} one type to another.
+
@item @emph{Standard}:
F95 and later
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 and 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}.
+
@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
@cindex @code{UNPACK} intrinsic
@cindex array manipulation
-Intrinsic implemented, documentation pending.
-
@table @asis
@item @emph{Description}:
+Store the elements of @var{VECTOR} in an array of higher rank.
+
@item @emph{Standard}:
F95 and later
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 sam 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(2,2) = (/ .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
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