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intrinsic.texi (PRODUCT, [...]): New.
2007-04-27 Daniel Franke <franke.daniel@gmail.com> * intrinsic.texi (PRODUCT, RESHAPE, SPACING, SPREAD, SUM, SYSTEM_CLOCK, TRANSFER, UNPACK): New. (DATE_AND_TIME, CPU_TIME, RRSPACING): Added cross references. From-SVN: r124222
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Daniel Franke
Daniel Franke
parent
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commit
1c6ab44ef7
@ -1,3 +1,9 @@
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2007-04-27 Daniel Franke <franke.daniel@gmail.com>
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* intrinsic.texi (PRODUCT, RESHAPE, SPACING, SPREAD, SUM,
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SYSTEM_CLOCK, TRANSFER, UNPACK): New.
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(DATE_AND_TIME, CPU_TIME, RRSPACING): Added cross references.
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2007-04-26 Daniel Franke <franke.daniel@gmail.com>
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* intrinsic.texi (NULL, PACK, PRESENT, REPEAT, SCAN, SHAPE,
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@ -2369,6 +2369,9 @@ program test_cpu_time
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print '("Time = ",f6.3," seconds.")',finish-start
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end program test_cpu_time
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@end smallexample
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@item @emph{See also}:
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@ref{SYSTEM_CLOCK}, @ref{DATE_AND_TIME}
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@end table
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@ -2548,6 +2551,9 @@ program test_time_and_date
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print '(8i5))', values
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end program test_time_and_date
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@end smallexample
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@item @emph{See also}:
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@ref{CPU_TIME}, @ref{SYSTEM_CLOCK}
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@end table
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@ -7562,12 +7568,13 @@ END PROGRAM
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@node PRODUCT
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@section @code{PRODUCT} --- Product of array elements
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@cindex @code{PRODUCT} intrinsic
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@cindex undocumented intrinsic
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Intrinsic implemented, documentation pending.
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@cindex array operation
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@table @asis
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@item @emph{Description}:
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Multiplies the elements of @var{ARRAY} along dimension @var{DIM} if
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the corresponding element in @var{MASK} is @code{TRUE}.
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@item @emph{Standard}:
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F95 and later
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@ -7575,10 +7582,38 @@ F95 and later
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Transformational function
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@item @emph{Syntax}:
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@code{RESULT = PRODUCT(ARRAY[, MASK])}
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@code{RESULT = PRODUCT(ARRAY, DIM[, MASK])}
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@item @emph{Arguments}:
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@multitable @columnfractions .15 .70
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@item @var{ARRAY} @tab Shall be an array of type @code{INTEGER(*)},
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@code{REAL(*)} or @code{COMPLEX(*)}.
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@item @var{DIM} @tab (Optional) shall be a scalar of type
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@code{INTEGER} with a value in the range from 1 to n, where n
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equals the rank of @var{ARRAY}.
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@item @var{MASK} @tab (Optional) shall be of type @code{LOGICAL}
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and either be a scalar or an array of the same shape as @var{ARRAY}.
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@end multitable
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@item @emph{Return value}:
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The result is of the same type as @var{ARRAY}.
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If @var{DIM} is absent, a scalar with the product of all elements in
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@var{ARRAY} is returned. Otherwise, an array of rank n-1, where n equals
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the rank of @var{ARRAY}, and a shape similar to that of @var{ARRAY} with
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dimension @var{DIM} dropped is returned.
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@item @emph{Example}:
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@item @emph{Specific names}:
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@smallexample
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PROGRAM test_product
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INTEGER :: x(5) = (/ 1, 2, 3, 4 ,5 /)
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print *, PRODUCT(x) ! all elements, product = 120
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print *, PRODUCT(x, MASK=MOD(x, 2)==1) ! odd elements, product = 15
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END PROGRAM
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@end smallexample
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@item @emph{See also}:
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@ref{SUM}
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@end table
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@ -7990,10 +8025,12 @@ end program
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@cindex @code{RESHAPE} intrinsic
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@cindex array manipulation
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Intrinsic implemented, documentation pending.
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@table @asis
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@item @emph{Description}:
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Reshapes @var{SOURCE} to correspond to @var{SHAPE}. If necessary,
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the new array may be padded with elements from @var{PAD} or permuted
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as defined by @var{ORDER}.
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@item @emph{Standard}:
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F95 and later
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@ -8001,11 +8038,37 @@ F95 and later
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Transformational function
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@item @emph{Syntax}:
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@code{RESULT = RESHAPE(SOURCE, SHAPE[, PAD, ORDER])}
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@item @emph{Arguments}:
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@multitable @columnfractions .15 .70
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@item @var{SOURCE} @tab Shall be an array of any type.
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@item @var{SHAPE} @tab Shall be of type @code{INTEGER} and an
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array of rank one. Its values must be positive or zero.
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@item @var{PAD} @tab (Optional) shall be an array of the same
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type as @var{SOURCE}.
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@item @var{ORDER} @tab (Optional) shall be of type @code{INTEGER}
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and an array of the same shape as @var{SHAPE}. Its values shall
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be a permutation of the numbers from 1 to n, where n is the size of
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@var{SHAPE}. If @var{ORDER} is absent, the natural ordering shall
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be assumed.
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@end multitable
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@item @emph{Return value}:
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The result is an array of shape @var{SHAPE} with the same type as
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@var{SOURCE}.
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@item @emph{Example}:
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@smallexample
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PROGRAM test_reshape
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INTEGER, DIMENSION(4) :: x
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WRITE(*,*) SHAPE(x) ! prints "4"
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WRITE(*,*) SHAPE(RESHAPE(x, (/2, 2/))) ! prints "2 2"
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END PROGRAM
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@end smallexample
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@item @emph{See also}:
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@ref{SHAPE}, @ref{SIZE}
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@ref{SHAPE}
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@end table
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@ -8038,6 +8101,8 @@ The return value is of the same type and kind as @var{X}.
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The value returned is equal to
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@code{ABS(FRACTION(X)) * FLOAT(RADIX(X))**DIGITS(X)}.
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@item @emph{See also}:
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@ref{SPACING}
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@end table
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@ -8444,7 +8509,7 @@ arrays must be allocated.
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@item @emph{Return value}:
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An @code{INTEGER} array of rank one with as many elements as @var{SOURCE}
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has dimensions. The elements of the resulting array correspond to the extent
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has dimensions. The elements of the resulting array correspond to the extend
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of @var{SOURCE} along the respective dimensions. If @var{SOURCE} is a scalar,
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the result is the rank one array of size zero.
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@ -8789,12 +8854,12 @@ The return value is of type default @code{REAL}.
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@node SPACING
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@section @code{SPACING} --- Smallest distance between two numbers of a given type
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@cindex @code{SPACING} intrinsic
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@cindex undocumented intrinsic
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Intrinsic implemented, documentation pending.
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@table @asis
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@item @emph{Description}:
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Determines the distance between the argument @var{X} and the nearest
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adjacent number of the same type.
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@item @emph{Standard}:
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F95 and later
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@ -8802,10 +8867,29 @@ F95 and later
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Elemental function
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@item @emph{Syntax}:
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@code{RESULT = SPACING(X)}
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@item @emph{Arguments}:
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@multitable @columnfractions .15 .70
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@item @var{X} @tab Shall be of type @code{REAL(*)}.
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@end multitable
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@item @emph{Return value}:
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The result is of the same type as the input argument @var{X}.
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@item @emph{Example}:
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@smallexample
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PROGRAM test_spacing
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INTEGER, PARAMETER :: SGL = SELECTED_REAL_KIND(p=6, r=37)
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INTEGER, PARAMETER :: DBL = SELECTED_REAL_KIND(p=13, r=200)
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WRITE(*,*) spacing(1.0_SGL) ! "1.1920929E-07" on i686
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WRITE(*,*) spacing(1.0_DBL) ! "2.220446049250313E-016" on i686
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END PROGRAM
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@end smallexample
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@item @emph{See also}:
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@ref{RRSPACING}
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@end table
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@ -8815,10 +8899,11 @@ Elemental function
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@cindex @code{SPREAD} intrinsic
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@cindex array manipulation
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Intrinsic implemented, documentation pending.
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@table @asis
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@item @emph{Description}:
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Replicates a @var{SOURCE} array @var{NCOPIES} times along a specified
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dimension @var{DIM}.
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@item @emph{Standard}:
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F95 and later
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@ -8826,10 +8911,32 @@ F95 and later
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Transformational function
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@item @emph{Syntax}:
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@code{RESULT = SPREAD(SOURCE, DIM, NCOPIES)}
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@item @emph{Arguments}:
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@multitable @columnfractions .15 .70
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@item @var{SOURCE} @tab Shall be a scalar or an array of any type and
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a rank less than seven.
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@item @var{DIM} @tab Shall be a scalar of type @code{INTEGER} with a
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value in the range from 1 to n+1, where n equals the rank of @var{SOURCE}.
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@item @var{NCOPIES} @tab Shall be a scalar of type @code{INTEGER}.
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@end multitable
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@item @emph{Return value}:
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The result is an array of the same type as @var{SOURCE} and has rank n+1
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where n equals the rank of @var{SOURCE}.
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@item @emph{Example}:
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@smallexample
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PROGRAM test_spread
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INTEGER :: a = 1, b(2) = (/ 1, 2 /)
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WRITE(*,*) SPREAD(A, 1, 2) ! "1 1"
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WRITE(*,*) SPREAD(B, 1, 2) ! "1 1 2 2"
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END PROGRAM
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@end smallexample
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@item @emph{See also}:
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@ref{UNPACK}
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@end table
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@ -9019,12 +9126,13 @@ To stat an open file: @ref{FSTAT}, to stat a link: @ref{LSTAT}
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@node SUM
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@section @code{SUM} --- Sum of array elements
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@cindex @code{SUM} intrinsic
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@cindex array manipulation
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Intrinsic implemented, documentation pending.
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@cindex array operation
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@table @asis
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@item @emph{Description}:
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Adds the elements of @var{ARRAY} along dimension @var{DIM} if
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the corresponding element in @var{MASK} is @code{TRUE}.
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@item @emph{Standard}:
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F95 and later
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@ -9032,9 +9140,37 @@ F95 and later
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Transformational function
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@item @emph{Syntax}:
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@code{RESULT = SUM(ARRAY[, MASK])}
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@code{RESULT = SUM(ARRAY, DIM[, MASK])}
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@item @emph{Arguments}:
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@multitable @columnfractions .15 .70
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@item @var{ARRAY} @tab Shall be an array of type @code{INTEGER(*)},
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@code{REAL(*)} or @code{COMPLEX(*)}.
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@item @var{DIM} @tab (Optional) shall be a scalar of type
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@code{INTEGER} with a value in the range from 1 to n, where n
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equals the rank of @var{ARRAY}.
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@item @var{MASK} @tab (Optional) shall be of type @code{LOGICAL}
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and either be a scalar or an array of the same shape as @var{ARRAY}.
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@end multitable
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@item @emph{Return value}:
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The result is of the same type as @var{ARRAY}.
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If @var{DIM} is absent, a scalar with the sum of all elements in @var{ARRAY}
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is returned. Otherwise, an array of rank n-1, where n equals the rank of
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@var{ARRAY},and a shape similar to that of @var{ARRAY} with dimension @var{DIM}
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dropped is returned.
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@item @emph{Example}:
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@smallexample
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PROGRAM test_sum
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INTEGER :: x(5) = (/ 1, 2, 3, 4 ,5 /)
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print *, SUM(x) ! all elements, sum = 15
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print *, SUM(x, MASK=MOD(x, 2)==1) ! odd elements, sum = 9
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END PROGRAM
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@end smallexample
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@item @emph{See also}:
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@ref{PRODUCT}
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@end table
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@ -9129,10 +9265,17 @@ Subroutine, non-elemental function
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@cindex time, current
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@cindex current time
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Intrinsic implemented, documentation pending.
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@table @asis
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@item @emph{Description}:
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Determines the @var{COUNT} of milliseconds of wall clock time since
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the Epoch (00:00:00 UTC, January 1, 1970) modulo @var{COUNT_MAX},
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@var{COUNT_RATE} determines the number of clock ticks per second.
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@var{COUNT_RATE} and @var{COUNT_MAX} are constant and specific to
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@command{gfortran}.
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If there is no clock, @var{COUNT} is set to @code{-HUGE(COUNT)}, and
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@var{COUNT_RATE} and @var{COUNT_MAX} are set to zero
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@item @emph{Standard}:
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F95 and later
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@ -9140,10 +9283,30 @@ F95 and later
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Subroutine
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@item @emph{Syntax}:
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@code{CALL SYSTEM_CLOCK([COUNT, COUNT_RATE, COUNT_MAX])}
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@item @emph{Arguments}:
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@item @emph{Return value}:
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@item @emph{Arguments}:
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@multitable @columnfractions .15 .70
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@item @var{COUNT} @tab (Optional) shall be a scalar of type default
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@code{INTEGER} with @code{INTENT(OUT)}.
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@item @var{COUNT_RATE} @tab (Optional) shall be a scalar of type default
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@code{INTEGER} with @code{INTENT(OUT)}.
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@item @var{COUNT_MAX} @tab (Optional) shall be a scalar of type default
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@code{INTEGER} with @code{INTENT(OUT)}.
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@end multitable
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@item @emph{Example}:
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@smallexample
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PROGRAM test_system_clock
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INTEGER :: count, count_rate, count_max
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CALL SYSTEM_CLOCK(count, count_rate, count_max)
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WRITE(*,*) count, count_rate, count_max
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END PROGRAM
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@end smallexample
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@item @emph{See also}:
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@ref{DATE_AND_TIME}, @ref{CPU_TIME}
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@end table
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@ -9360,12 +9523,15 @@ See @code{HUGE} for an example.
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@node TRANSFER
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@section @code{TRANSFER} --- Transfer bit patterns
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@cindex @code{TRANSFER} intrinsic
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@cindex bit operations
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Intrinsic implemented, documentation pending.
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@cindex type cast
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@table @asis
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@item @emph{Description}:
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Interprets the bit pattern of @var{SOURCE} as a variable of the
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same type and type parameters as @var{MOLD}.
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This is also known as @emph{casting} one type to another.
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@item @emph{Standard}:
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F95 and later
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@ -9373,10 +9539,27 @@ F95 and later
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Transformational function
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@item @emph{Syntax}:
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@code{RESULT = TRANSFER(SOURCE, MOLD[, SIZE])}
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@item @emph{Arguments}:
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@multitable @columnfractions .15 .70
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@item @var{SOURCE} @tab Shall be a scalar or an array of any type.
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@item @var{MOLD} @tab Shall be a scalar or an array of any type.
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@item @var{SIZE} @tab (Optional) shall be a scalar and of type
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@code{INTEGER}.
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@end multitable
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@item @emph{Return value}:
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The result has the same type as @var{MOLD} with the bit level
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representation of @var{SOURCE}.
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@item @emph{Example}:
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@item @emph{See also}:
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@smallexample
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PROGRAM test_transfer
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integer :: x = 2143289344
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print *, transfer(x, 1.0) ! prints "NaN" on i686
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END PROGRAM
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@end smallexample
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@end table
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@ -9612,10 +9795,10 @@ Subroutine, non-elemental function
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@cindex @code{UNPACK} intrinsic
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@cindex array manipulation
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Intrinsic implemented, documentation pending.
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@table @asis
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@item @emph{Description}:
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Store the elements of @var{VECTOR} in an array of higher rank.
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@item @emph{Standard}:
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F95 and later
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@ -9623,12 +9806,35 @@ F95 and later
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Transformational function
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@item @emph{Syntax}:
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@code{RESULT = UNPACK(VECTOR, MASK, FIELD)}
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@item @emph{Arguments}:
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@multitable @columnfractions .15 .70
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@item @var{VECTOR} @tab Shall be an array of any type and rank one. It
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shall have at least as many elements as @var{MASK} has @code{TRUE} values.
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@item @var{MASK} @tab Shall be an array of type @code{LOGICAL}.
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@item @var{FIELD} @tab Shall be of the sam type as @var{VECTOR} and have
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the same shape as @var{MASK}.
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@end multitable
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@item @emph{Return value}:
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The resulting array corresponds to @var{FIELD} with @code{TRUE} elements
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of @var{MASK} replaced by values from @var{VECTOR} in array element order.
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@item @emph{Example}:
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@smallexample
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PROGRAM test_unpack
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integer :: vector(2) = (/1,1/)
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logical :: mask(2,2) = (/ .TRUE., .FALSE., .FALSE., .TRUE. /)
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integer :: field(2,2) = 0, unity(2,2)
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! result: unity matrix
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unity = unpack(vector, reshape(mask, (/2,2/), field)
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END PROGRAM
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@end smallexample
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@item @emph{See also}:
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@ref{PACK}
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@ref{PACK}, @ref{SPREAD}
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@end table
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