[SciPy-user] Eigenvalues and eigenvectors

[David Grant]

On 7/11/06, Bill Baxter <wbaxter at gmail.com> wrote:
>
> 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.
>

Funny you mention it, I could have really used a wrapper for ARPACK last
year... I actually started to work on doing it but it was over my head.

-- 
David Grant
Please Note my new email address: davidgrant at gmail.com
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