Re: [f2py] f2py, C, and multidimensional arrays.

why not use SWIG? ~Josef

On May 28, 2010, at 11:41 PM, Daniel Welling wrote:

> Greetings.  I am new to F2py and am trying to use it to wrap some  
> simple C functions.  I've had success with scalars and vectors, but  
> cannot get any multidimensional arrays to work correctly.  An example:
>
> /* bar.c */
> void bar(int n, int m, double **x) {
>   int i, j;
>   for (i=0; i<n; i++)
>     for (j=0; j<m; j++)
>       printf("Position %i, %i = %.3f\n", i, j, x[i][j]);
> }
>
> ! wrapper m.pyf
> python module m
> interface
>   subroutine bar(n, m, x)
>     intent(c) bar
>     intent(c)
>     integer intent() :: n
>     integer intent() :: m
>     double precision intent(in) :: x(n,m)
>   end subroutine bar
> end interface
> end python module m
>
> Build shared object:
> $ f2py2.5 foo.c foo.pyf -c
>
> Try to run it:
> >>>import m
> >>>import numpy as np
> >>>dog = np.zeros((0,0))
> >>>m.bar(dog)
> Bus error
>
> And that's it.  It drops me out of ipython/python shell and back to  
> the bash prompt.  I cannot find any examples similar to this, nor  
> any mailing list threads on this topic.  Does anyone have any  
> experience with such examples?
>
> Thanks for your help.
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--
Josef Koller, Ph.D.            (TSPA/Correspondence)
Space Science and Applications, ISR-1, MS D466
Los Alamos National Laboratory, NM 87545-1663
Phone: (505) 665 3399           http://www.koller.info
Fax:      (505) 665 7395       email: [email protected]