Andrea,
It is my understanding that swig typemaps only apply to function
arguments. Since what you are talking about is a global variable, I
don't believe typemaps will help you. I would try
%{
#include "header-that-contains-vec.h"
npy_intp vec_dims[ ] = { (npy_intp) length_of_vec };
%}
%rename(vec) numpy_vec;
%ignore vec;
%include "header-that-contains-vec.h"
%inline %{
PyObject * numpy_vec = PyArray_SimpleNewFromData(1, vec_dims,
NPY_DOUBLE, (void*)vec);
%}
I guess it would be nice if you could force a "Py_DECREF(numpy_vec);"
before the module is destroyed, but I'll leave that as an exercise...
On Feb 16, 2007, at 10:59 AM, Andrea Tomadin wrote:
> Il giorno 15/feb/07, alle ore 22:26, Bill Spotz ha scritto:
>
>> It seems to me you would need to %ignore vec, so that it is not
>> wrapped as a raw pointer to a double, and then in your interface
>> file create a PyArrayObject whose data buffer points to vec (the
>> most efficient way to do this is with %inline). Then use %rename
>> to rename whatever you called your PyArrayObject to "vec" (or not,
>> if you do not care about the name). Finally,
>>
>> foo.cvar.vec = numpy.zeros(10)
>>
>> is going to decrement (and probably delete) your original vec and
>> replace it with the new array of zeros (I think,
>
> Thank you Bill for your help, even if writing this code is not
> straightforward for me. Anyway, while I was reading the docs, I
> became aware of the varin, varout typemap options. I wonder if I can
> define a
> typemap(varin) double *
> declaration, and insert in it the same code that in "numpy.i"
> translates the PyArrayObject into a C array and vice versa.
> But I cannot find an example of typemp(varin) for Python, so I don't
> know what to use for the output, instead of $1. Where are the typemaps
> (varin) for Python?
> It seems strange that nobody wrote a public code for such a simple
> task, as I read that Swig supports Python since the 90s! I suspect I
> have just not looked in the right places?!
>
> Thank you again for help!
> Andrea
** Bill Spotz **
** Sandia National Laboratories Voice: (505)845-0170 **
** P.O. Box 5800 Fax: (505)284-5451 **
** Albuquerque, NM 87185-0370 Email: [EMAIL PROTECTED] **
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