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Compiling DLLs - 64 bit not allowed?
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mecej4



Joined: 31 Oct 2006
Posts: 732

PostPosted: Fri Aug 04, 2017 9:24 pm    Post subject: Reply with quote

Fortran provides other facilities to do what you used FORALL for; among them are array expressions, array constructors and and array assignments. Your entire code could be rewritten as
Code:

PROGRAM example
    IMPLICIT NONE

    INTEGER :: irows, nrows = 5
    INTEGER, ALLOCATABLE :: array(:)

    ALLOCATE(array(nrows))
    array=2*[(irows, irows = 1,nrows)]
    PRINT*,  array
    DEALLOCATE(array)

END PROGRAM

The expression within brackets is an array constructor based on an implied DO loop, and that expression is an array expression even after the multiplication by 2. The statement on that line is an array assignment.
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viroxa



Joined: 28 Jul 2017
Posts: 70

PostPosted: Fri Aug 04, 2017 10:18 pm    Post subject: Reply with quote

Good to know, thanks! And how could one handle more complex functions?
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mecej4



Joined: 31 Oct 2006
Posts: 732

PostPosted: Fri Aug 04, 2017 11:45 pm    Post subject: Reply with quote

That would depend on the nature of the function, so it is not easy to give a universal prescription.

You could program your complicated function using simple code at first, get it to produce correct results, and then look into making the code faster by vectorization, parallelization and other methods.
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viroxa



Joined: 28 Jul 2017
Posts: 70

PostPosted: Sat Aug 05, 2017 12:14 pm    Post subject: Reply with quote

OK, thanks!
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