[SciPy-user] Eigenvalues and eigenvectors

[Bill Baxter]

On 7/12/06, David Grant <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

f2py is supposedly easy to use, so I guess I'm going to have to figure it
out eventually.  Currently, though, I've hit a dead-end trying to compile
SciPy on Windows.

--bb
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.scipy.org/pipermail/scipy-user/attachments/20060712/6dd5c275/attachment.html>