[SciPy-user] Eigenvalues and eigenvectors
Bill Baxter
wbaxter at gmail.com
Tue Jul 11 20:34:49 EDT 2006
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
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