[SciPy-dev] Status of arpack

Matthieu Brucher matthieu.brucher@gmail....
Fri Jan 18 06:50:45 CST 2008

2008/1/18, Arnar Flatberg <arnar.flatberg@gmail.com>:
> Hi,
> Ive been using the sandbox version for a while, and have experienced
> no problems with the *patched* version.

OK, I'll just wait for someone to put it in the correct module.

However, FYI, the highlevel
> interface (arpack.eigen and arpack.eigen_symmetric) still doesnt
> implement the generalised eigendecomposition, which may be important
> to you. (Im guessing that you will use this for the manifold learning
> scikit, and lots of these algortihms commonly use gen.eig).

In fact, it is not needed, it can be rewritten as a classic
eigendecomposition problem (at least for Laplacian Eigenmaps).

I dont
> think this would be terrible hard to implement (arpack.speigs supports
> it) and would be nice to add  prior to inclusion in the trunk.

French PhD student
Website : http://matthieu-brucher.developpez.com/
Blogs : http://matt.eifelle.com and http://blog.developpez.com/?blog=92
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