[SciPy-user] Fixes to svd?
Nick Arnett
narnett at mccmedia.com
Fri Oct 1 09:38:04 CDT 2004
In trying to use linalg.svd, I found that I had to make a couple of
changes to decomp.py to get things to work... and I'm wondering if they
were correct. This is my first stab at using Scipy.
The first problem I hit was that Python didn't recognize the call to
diag (part = diag(s)) in diagsvd. Looking around for where that seemed
to live, I decided to add matrix_base to the scipy_base imports:
from scipy_base import asarray_chkfinite, asarray, matrix_base
... and then changed the first line of diagsvd to:
part = matrix_base.diag(s)
That seems to work.
Just below, also in diagsvd, Python didn't recognize "zeros", which I'm
assuming it should be getting from Numeric... and although I'm certain
that Scipy is supposed to use Numeric, I couldn't see where it was being
imported in decomp, so I added:
from Numeric import zeros
Now things seem to be working and the matrix produced by diagsvd looks
reasonable, though I haven't yet done any of the really big matrices
I'll be processing.
Any feedback on whether or not this was the appropriate way to fix things?
Nick
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