C binding to transfer matrices from C to Python and from Python toC

[Nils Wagner]

Hi all,

Has someone written a C binding to transfer matrices from C to Python
and vice versa ?

Any pointer would be appreciated.

Nils

[David M. Cooke]

Nils Wagner <nw*****@mecha. uni-stuttgart.de> writes:

Hi all,

Has someone written a C binding to transfer matrices from C to Python
and vice versa ?

Is your question more along the lines of "I have an algorithm written
in C that operates on matrices; how do I call it from Python?"

I presume you want Numeric or numarray matrices.

From easy to hard (and less to more powerful :-):

- f2py will wrap C code. However, last I checked, the documentation
isn't the clearest on how to do this.
- weave in scipy (and I know you use scipy ;-). This allows you to
write C code inline; I think you can link with an external routine.
- pyrex is a Python-like language for writing extensions. To access
arrays, you'll have to include some definitions of the appropiate
array types from the Numeric or numarray headers.
- use SWIG to generate wrappers. You'll have to do a bit of work with
typemaps for passing arrays around.
- writing a C extension by hand. See the Python docs about writing
extensions, and the Numeric and numarray docs about the C API.

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|David M. Cooke
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