c4py matrix_maker

$ cat matrix.c 
#include <python2.7/Python.h>
#include <stdlib.h>
static PyObject *matrix_maker_cmd(PyObject *self,PyObject *val)
{
    double nRow,nCol;
    double **a;
    int i,j;
    if(!PyArg_ParseTuple(val,"ii",&nRow,&nCol))
        return NULL;
    a = malloc(nRow*nCol*6);
    for(i=0; i<nRow; ++i){
    for(j=0; j<nCol; ++j){    
        a[i][j]=cos(i+j);
    }
    }
    return Py_BuildValue("d",a);
}
static PyMethodDef threeMethods[] = {
    {"matrix_maker",matrix_maker_cmd,METH_VARARGS,"calc matrix elem"},
    {NULL,NULL,0,NULL}
};
void initthree(void)
{
    Py_InitModule("matrix",threeMethods);
}

$ cat test_matrix.py
#!/usr/bin/python
import matrix
print matrix_maker(5,4)

$ ./test_matrix.py
Traceback (most recent call last):
  File "./test_matrix.py", line 2, in <module>
    import matrix
ImportError: dynamic module does not define init function (initmatrix)