[SciPy-User] SWIG/numpy help
Leon Sit
wing1127aishi at gmail.com
Fri Apr 30 10:28:41 EDT 2010
Hi all:
I am trying to pass data around the numpy and boost::ublas layers. I
have written an ultra thin wrapper because swig cannot parse ublas'
header correctly. The code is shown below
-----------------------------------------------------------------------------------
#include <boost/numeric/ublas/vector.hpp>
#include <boost/numeric/ublas/matrix.hpp>
#include <boost/lexical_cast.hpp>
#include <algorithm>
#include <sstream>
#include <string>
using std::copy;
using namespace boost;
typedef boost::numeric::ublas::matrix<double> dm;
typedef boost::numeric::ublas::vector<double> dv;
class dvector : public dv{
public:
dvector(const int rhs):dv(rhs){;};
dvector();
dvector(const int size, double* ptr):dv(size){
copy(ptr, ptr+sizeof(double)*size, &(dv::data()[0]));
}
~dvector(){}
};
-------------------------------------------------------------------------------------------------
with the SWIG interface that looks something like
-----------------------------------------------------------------------------------------------
%apply(int DIM1, double* INPLACE_ARRAY1) {(const int size, double* ptr)}
class dvector{
public:
dvector(const int rhs);
dvector();
dvector(const int size, double* ptr);
%newobject toString;
char* toString();
~dvector();
};
---------------------------------------------------------------------------------------------------
I have compiled them successfully via gcc 4.3 and vc++9.0. However
when I simply run
a = dvector(array([1.,2.,3.]))
it gives me a segfault. This is the first time I use swigh with numpy
and not have fully understanding between the data conversion and
memory buffer passing. Does anyone see something obvious I have
missed? Anything is appreciated.
Best Regards,
Leon Sit
Graduate Student in Statistics at Rutgers University
wing1127aishi at gmail.com
http://eden.rutgers.edu/~wingsit/
More information about the SciPy-User
mailing list