python - SWIG2 with NUMPY -


i trying build swig2.0 interface c++ class. requirement need able pass numpy array python c++ class.

i have simple c++ class :

// // file : matmanip.h // #ifndef __mat_manip_h #define __mat_manip_h  #include <iostream>   class matmanip { public:   matmanip();    // matrix of length d   void set_matrix( float * m, int d );  };  #endif

the .cpp file : 

#include <iostream> #include "matmanip.h"  // file : matmanip.cpp matmanip::matmanip() { std::cout << "constructor\n"; }  void matmanip::set_matrix( float * m, int d ) {   for( int i=0 ; i<d ; i++ )     std::cout << "m[" << << "] = " << m[i] << std::endl; }

my swig interface file (matmanip.i). obtained numpy.i file https://github.com/numpy/numpy/blob/master/tools/swig/numpy.i : 

%module matmanip  %{ #define swig_file_with_init #include "matmanip.h" %}  %include "numpy.i"  %init %{ import_array(); %}   %apply( float * in_array1, int dim1) {(double * seq, int n) }; %include "matmanip.h"

here compile:

    $ swig -c++ -python matmanip.i     $ g++ -fpic -c matmanip.cpp     $ g++ -fpic -c matmanip_wrap.cxx -i /usr/include/python2.7     $ g++ -shared matmanip.o matmanip_wrap.o  -o _matmanip.so     $ ls matmanip.cpp  matmanip.o    _matmanip.so       numpy.i matmanip.h    matmanip.py   matmanip_wrap.cxx matmanip.i    matmanip.pyc  matmanip_wrap.o

until point work! can see _matmanip.so.

however, try import matmanip in python here error

$ python >>> import numpy np >>> matmanip import matmanip >>> m = matmanip() constructor >>> m.set_matrix( np.array( [2.0, 3.4, 5.8] ) ) traceback (most recent call last):   file "<stdin>", line 1, in <module>   file "matmanip.py", line 82, in set_matrix     def set_matrix(self, *args): return _matmanip.matmanip_set_matrix(self, *args) typeerror: matmanip_set_matrix() takes 3 arguments (2 given) >>>

i puzzled! swig version 2.0.12. numpy 1.12.1. python version 2.7.12. g++ version 5.4.0. on ubuntu 16.04.


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