On Mon, Jun 29, 2009 at 3:03 PM, Russell E. Owen <ro...@u.washington.edu>wrote:
> I have an old Numarray C extension (or, rather, a Python package > containing a C extension) that I would like to convert to numpy > (in a way that is likely to be supported long-term). > > Options I have found include: > > - Use the new numpy extension. This seems likely to be fast and > future-proof. But I am finding the documentation slow going. Does anyone > know of a simple example (e.g. read in an array, create a new array)? > > - Use the Numarray compatible C API. Simple (and takes advantage of the > nice Numarray tutorial example for documentation), but will this be > supported in the long term? > > - Switch to ctypes. Simple in concept. But I'm wondering if I can get > distutils to build the resulting package. > > - Use SWIG. I have some experience with it, but not with numpy arrays. > > - Use Cython to replace the C code. No idea if this is a long-term > supported package. > > Another option is to try to rewrite in pure python. Perhaps the numpy > indexing is sophisticated enough to allow an efficient solution. The C > extension computes a radial profile from a 2-d masked array: > radProf(r)= sum of all unmasked pixels at radius r about some > specified center index > I can easily generate (and cache) a 2-d array of radius index, but is it > possible to use that to efficiently generate the desired sum? > > Any opinions? > How big is the extension and what does it do? Chuck
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