Re: [f2py] Errors with size 0 arrays

Hi,

f2py generated wrapper code does not support creating 0-size arrays
as, in general, passing such arrays to Fortran code is a potential
source of trouble.

If you still think that it would be worthwhile to have such behavior, please
create the corresponding ticket (in numpy trac) and mark it as a
feature request.

As a workaround, you can create a small Python wrapper around f2py generated
wrapper function that checks the u==0 condition and does what you would
expect without calling the f2py generated function.

HTH,
Pearu

On Tue, Jul 9, 2013 at 6:23 PM, Ed <[email protected]> wrote:
> I have the following subroutine:
>
>       SUBROUTINE test(u,outarr)
>          implicit none
>          INTEGER, INTENT(in) :: u
>          DOUBLE PRECISION, INTENT(out), DIMENSION(u) :: outarr
>          END SUBROUTINE
>
> f2py compiles it fine, and I can import it without problem. For all positive
> integers, the subroutine runes fine, giving me an array of size u with all
> values zero. However, upon trying to run the above with u=0, I get the
> following error:
>
> ValueError: failed to create intent(cache|hide)|optional array-- must have
> defined dimensions but got (0,)
>
> How do I go about fixing this, so I get an array of size 0?
>
>
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