[SciPy-user] Sparse v. dense matrix, SVD and LSI-like analysis
narnett at mccmedia.com
Wed Nov 17 13:41:13 CST 2004
Robert Kern wrote:
> An SVD is not the same as an eigen decomposition.
That dawned on me not too long after posting. Fuzzy brain this week, a
birth and a death in the family a few days apart.
> In any case, all of the linalg.* functions only operate on dense arrays,
> not sparse matrices.
Ummm, now I'm thinking I'm in over my head. SVD is a matrix operation
isn't it? I was imagining that an array of mostly zeros would be the
equivalent of a sparse matrix, so that SVD would apply to it for what
I'm doing, which is related to latent semantic analysis.
Am I way off-base here? My understanding of Scipy isn't great,
compounded by a less-than-great grasp of the mathematics. Learning as
go, in large part.
Any help gratefully accepted.
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