[Numpy-discussion] C-API: How is data filling done in PyArray_SimpleNewFromData ?

Raspaud Martin martin.raspaud@smhi...
Tue Oct 27 07:43:54 CDT 2009


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Hello,

I’m using numpy v1.2.0, and I have the following codes that provide
different results :

- ---------------------
cal = (PyArrayObject *)PyArray_SimpleNew(2,dims,NPY_FLOAT);
for(i=0;i<dims[0];i++)
  for(j=0;j<dims[1];j++)
    {
      *((npy_float *)PyArray_GETPTR2(cal,i,j))=(npy_float)in[i][j];
    }
- ---------------------
and
- ---------------------
cal = (PyArrayObject *)PyArray_SimpleNewFromData(2,dims,NPY_FLOAT,in);
- ---------------------

As you probably guessed, "in" is a 2D array of floats of dimensions "dims".

My questions are thus:
- - Why do the two methods provide different results ?
- - How do I get the second to behave like the first ?

Thanks,

Martin
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