Dylan,
The error appears to be in example.c, not example_wrap.c. The way you have
written it, I think it should be double **x0.
But the SWIG typemaps require double*.
You could write it with double *x0, but then index with x0[i*m+j].
Or, if you want the [i][j] indexing, you could write a wrapper function with
double *x1 that calls your matrix_example() function with &x1. And then wrap
the wrapper function.
-Bill
On Sep 4, 2012, at 5:18 PM, Dylan Temple wrote:
> Hello,
>
> I am trying to use numpy.i to move a function from python to C that takes a
> 2-D array as an input and am having difficulty. The code is pretty long so
> I've made a simple example that recreates the error.
>
> example.c:
>
> #include <stdio.h>
> #include "example.h"
>
> void matrix_example (int n, int m, double *x0, \
> int p, double *x)
> {
> int i;
> int j;
> int k;
> for (i = 0; i < n; ++i) {
> for (j=0; j < 0; ++j) {
> x[k] = 2 * x0[i][j];
> ++k;
> }
> }
> }
>
> example.h:
>
> void matrix_example (int n, int m, double *x0, int p, double *x);
>
> example.i:
>
> %module example
>
> %{
> #define SWIG_FILE_WITH_INIT
> #include "example.h"
> %}
>
> %include "numpy.i"
>
> %init %{
> import_array();
> %}
>
> %apply (int DIM1, int DIM2, double *IN_ARRAY2) {(int n, int m, double *x0)};
> %apply (int DIM1, double *ARGOUT_ARRAY1) {(int p, double *x)};
>
> I then use prompts:
>
> $ swig -python example.i
> $ python setup.py build_ext --inplace
>
> However I get the error:
> example.c: In function ‘matrix_example’:
> example.c:12: error: subscripted value is neither array nor pointer
> error: command 'gcc' failed with exit status 1
>
> It seems as though x0 is not actually being passed to the function as a 2-D
> array. Any help on why this error is happening would be great!
>
>
> Thank you,
> Dylan Temple
>
> --
> Dylan Temple
> Graduate Student, University of Michigan NA&ME Department
> B.E. Naval Architecture
> M.S.E Naval Architecture
> 121 NA&ME Department, 2600 Draper Dr.
> 607-592-1749
>
> _______________________________________________
> NumPy-Discussion mailing list
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** Bill Spotz **
** Sandia National Laboratories Voice: (505)845-0170 **
** P.O. Box 5800 Fax: (505)284-0154 **
** Albuquerque, NM 87185-0370 Email: [email protected] **
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