[SciPy-dev] integration of symeig in SciPy

Robert Kern robert.kern@gmail....
Thu Oct 23 11:33:57 CDT 2008

On Thu, Oct 23, 2008 at 11:04, Tiziano Zito <opossumnano@gmail.com> wrote:
> Dear SciPy devs,
> there has been some discussion about integrating symeig in SciPy.
> symeig <http://mdp-toolkit.sourceforge.net/symeig.html> is a Python
> wrapper for the LAPACK functions to solve the standard and
> generalized eigenvalue problems for symmetric (hermitian) positive
> definite matrices. It is superior to the scipy "linalg.eigh" wrapper
> because it wraps *all* relevant LAPACK routines, enabling for
> example to just return a subset of all egenvectors/eigenvalues,
> which is a killer feature if you are dealing with huge-nonsparse
> matrices. Some of these LAPACK routines are available in
> scipy.lib.lapack.flapack and can be accessed through
> scipy.lib.lapack.get_lapack_funcs . Some of them are still missing
> in scipy, while symeig offers a unified interface to all relevant
> LAPACK functions.  symeig has been dowloaded  more than 1300 times
> since its first public appearance on sourceforge (under the
> mdp-toolkit package) in 2004. It features a complete unit test and a
> telling doc-string. I am one of the authors of symeig and have been
> contacted by some scipy devs to discuss the integration of symeig in
> scipy. I am more than willing to help doing this. The most difficult
> part (the LGPL license) has been addressed already: I've re-issued
> symeig under a BSD license. Next step would be to adapt symeig code
> and tests to the scipy framework. Some questions to you:
> - where would you like to have symeig? (I would suggest scipy.linalg)


> - should we change the signature to match or resamble that of other
>  eigenproblem-related functions in scipy?


> - is there a responsible scipy dev for the linalg package I can bother
>  with any questions I may have in the process?

You can bother the list.

> - do I get svn commit rights or should I work on a local copy and
>  send a patch?

We'll get you commit rights.

Thanks! I'm looking forward to seeing this in scipy.

Robert Kern

"I have come to believe that the whole world is an enigma, a harmless
enigma that is made terrible by our own mad attempt to interpret it as
though it had an underlying truth."
  -- Umberto Eco

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