[SciPy-user] Eigenvalues and eigenvectors

[Albert Strasheim]

Hello all

Nils Wagner wrote:
> Bill Baxter wrote:
> > On 7/12/06, *David Grant* <davidgrant at gmail.com
> > <mailto:davidgrant at gmail.com>> wrote:
> >
> >     What function should I use to get some eigenvalues and
> >     eigenvectors? There are so many and it's difficult to pin down
> >     what they are all for.
> >
> >
> > This probably isn't what you meant, but...
> > last I checked there was no function in Scipy that would let you get
> > just *some* eigenvalues and eigenvectors.  eig() gets you *all*
> > eigenvals/vecs whether you want them or not.   Which is really a bad
> > idea if you're trying to do some sort of eigenvector-based
> > compression/dimension-reduction on a 5000 dimensional dataset.
> >
> > SciPy really needs a wrapper for ARPACK.
> >    http://www.caam.rice.edu/software/ARPACK/download.html
> >
> +1

Definately another +1.

MATLAB's eigs (sparse eig) also uses some ARPACK functions. I'd like to
tackle this problem, but I'll probably only get to it at the of August (if
someone doesn't beat me to it, hopefully).

Regards,

Albert