Several numpy arrays with SWIG

Question

I am using SWIG to pass numpy arrays from Python to C++ code:

%include "numpy.i"
%init %{
import_array();
%}

%apply (float* INPLACE_ARRAY1, int DIM1) {(float* data, int n)};

class Class 
{
  public: 
  void test(float* data, int n)
  {
    //...
  }
};

and in Python:

c = Class()
a = zeros(5)
c.test(a)

This works, but how can I pass multiple numpy arrays to the same function?

Petter · Accepted Answer · 2010-07-20 13:46:22Z

9

I found out the answer from a collegue of mine:

%apply (float* INPLACE_ARRAY1, int DIM1) {(float* data1, int n1), (float* data2, int n2)};

class Class 
{
  public: 
  void test(float* data1, int n1, float* data2, int n2)
  {
    //...
  }
};

Now two numpy arrays are passed to Class::test.

edited Jul 20, 2010 at 13:46

answered Apr 20, 2010 at 21:32

Petter

38.8k7 gold badges50 silver badges66 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Martin Over a year ago

you can shorten the apply directive a little bit by applying the typemap to both input pairs at the same time: %apply (float* INPLACE_ARRAY1, int DIM1) {(float* data1, int n1), (float* data2, int n2)};

Collectives™ on Stack Overflow

Several numpy arrays with SWIG

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related