COUNT
— Count function ¶Counts the number of .TRUE.
elements in a logical MASK,
or, if the DIM argument is supplied, counts the number of
elements along each row of the array in the DIM direction.
If the array has zero size, or all of the elements of MASK are
.FALSE.
, then the result is 0
.
Fortran 90 and later, with KIND argument Fortran 2003 and later
Transformational function
RESULT = COUNT(MASK [, DIM, KIND])
MASK | The type shall be LOGICAL . |
DIM | (Optional) The type shall be INTEGER . |
KIND | (Optional) A scalar INTEGER constant
expression indicating the kind parameter of the result. |
The return value is of type INTEGER
and of kind KIND. If
KIND is absent, the return value is of default integer kind.
If DIM is present, the result is an array with a rank one less
than the rank of ARRAY, and a size corresponding to the shape
of ARRAY with the DIM dimension removed.
program test_count integer, dimension(2,3) :: a, b logical, dimension(2,3) :: mask a = reshape( (/ 1, 2, 3, 4, 5, 6 /), (/ 2, 3 /)) b = reshape( (/ 0, 7, 3, 4, 5, 8 /), (/ 2, 3 /)) print '(3i3)', a(1,:) print '(3i3)', a(2,:) print * print '(3i3)', b(1,:) print '(3i3)', b(2,:) print * mask = a.ne.b print '(3l3)', mask(1,:) print '(3l3)', mask(2,:) print * print '(3i3)', count(mask) print * print '(3i3)', count(mask, 1) print * print '(3i3)', count(mask, 2) end program test_count