Kevin, You need to declare vecSum() *after* you %include "numpy.i" and use the %apply directive. Based on what you have, I think you can just get rid of the "extern double vecSum(...)". I don't see what purpose it serves. As is, it is telling swig to wrap vecSum() before you have set up your numpy typemaps.
On Mar 24, 2009, at 10:33 AM, Kevin Françoisse wrote: > Hi everyone, > > I have been using NumPy for a couple of month now, as part of my > research project at the university. But now, I have to use a big C > library I wrote myself in a python project. So I choose to use SWIG > for the interface between both my python script and my C library. To > make things more comprehensible, I wrote a small C methods that > illustrate my problem: > > /* matrix.c */ > > #include <stdlib.h> > #include <stdio.h> > /* Compute the sum of a vector of reals */ > double vecSum(int* vec,int m){ > int i; > double sum =0.0; > > for(i=0;i<m;i++){ > sum += vec[i]; > } > return sum; > } > > /***/ > > /* matrix.h */ > > double vecSum(int* vec,int m); > > /***/ > > /* matrix.i */ > > %module matrix > %{ > #define SWIG_FILE_WITH_INIT > #include "matrix.h" > %} > > extern double vecSum(int* vec, int m); > > %include "numpy.i" > > %init %{ > import_array(); > %} > > %apply (int* IN_ARRAY1, int DIM1) {(int* vec, int m)}; > %include "matrix.h" > > /***/ > > I'm using a python script to compile my swig interface and my C > files (running Mac OS X 10.5) > > /* matrixSetup.py */ > > from distutils.core import setup, Extension > import numpy > > setup(name='matrix', version='1.0', ext_modules > =[Extension('_matrix', ['matrix.c','matrix.i'], > include_dirs = [numpy.get_include(),'.'])]) > > /***/ > > Everything seems to work fine ! But when I test my wrapped module in > python with an small NumPy array, here what I get : > > >>> import matrix > >>> from numpy import * > >>> a = arange(10) > >>> matrix.vecSum(a,a.shape[0]) > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > TypeError: in method 'vecSum', argument 1 of type 'int *' > > How can I tell SWIG that my Integer NumPy array should represent a > int* array in C ? > > Thank you very much, > > Kevin > <ATT00002.txt> ** Bill Spotz ** ** Sandia National Laboratories Voice: (505)845-0170 ** ** P.O. Box 5800 Fax: (505)284-0154 ** ** Albuquerque, NM 87185-0370 Email: wfsp...@sandia.gov ** _______________________________________________ Numpy-discussion mailing list Numpy-discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion