[SciPy-user] swig and numpy.i

Jaonary Rabarisoa jaonary@gmail....
Thu Oct 11 02:57:45 CDT 2007


Hi all,

I'm trying to write a c++ code that I need to call in python and is able to
use numpy and scipy.
I've already read the documentation about the numpy.i interface file and
succed to use it correctly when I want to pass an array as argument of my
function. In other words, I've tried something like this :

in the file "sum.h"
double sum(double* v,int n); // a function the compute the sum of the
element of v

in the swig interface file "sum.i"

%module mysum
%{
#define SWIG_FILE_WITH_INIT
#include "sum.h"
%}

%include "numpy.i"

%init %{
import_array();
%}

%apply(double* IN_ARRAY1,int DIM1){(double* v,int n)}
%include "sum.h"

This thing  works correctly and I'm happy. But  now I'd like to do
something a little bit complicated.  I'd like to  use a function that uses
not only an array but another argument such as scalar. For example, I need
to wrap the following C++ code :

void multiply(double* v,int  n,double  a,double* res);  // this  code  will
multiply all  elements of v by a and return a new  vector that contain the
result, res[i] = v[i]*a. And here comes the problem, I cant figure out how
to use the numpy.i interface file to do this.

Any tips and help will be appreciated.

Best regards,

Jaonary
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