[Numpy-discussion] incorporating C/C++ code (original) (raw)

Travis Oliphant oliphant.travis at ieee.org
Thu Jun 29 13:48:21 EDT 2006

Joris De Ridder wrote:

Hi,

For heavy number crunching I would like to include C and/or C++ functions in my NumPy programs. They should have/give NumPy arrays as input/output. On http://www.scipy.org/TopicalSoftware I find several suggestions to wrap C/C++ code: SWIG, weave, Pyrex, Instant, ... but it's quite difficult for me to have an idea which one I can/should use. This is my personal preference order:

  1. If you can write Fortran code --- do it and use f2py

  2. If you have well-encapsulated functions to call then use either weave or ctypes (both are very nice).

  3. PyRex is a great option for writing a custom extension module that needs a lot of capability built in.

At this point I would not use SWIG or Instant.

So, if Fortran is out for you, then install scipy (or install weave separately) and start with weave http://www.scipy.org/Weave

If you can compile your C/C++ functions as a shared-library, then check-out ctypes as well.

-Travis

So, a few questions:

Any suggestion for which package I should use? Does this heavily depend for which purpose I want to use it? Where can I find the docs for Weave? I find several links on the internet pointing to http://www.scipy.org/documentation/weave for more info, but there is nothing anymore. Thanks in advance, Joris

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