[SciPy-Dev] SVDLIBC for sparse SVDs

Dag Sverre Seljebotn d.s.seljebotn@astro.uio...
Wed Dec 12 02:23:58 CST 2012

On 12/12/2012 01:34 AM, Pauli Virtanen wrote:
> 10.12.2012 20:29, Jake Vanderplas kirjoitti:
> [clip]
>> I could be convinced either way, but I thought I'd ask the list: any
>> thoughts on whether this would be worth including in Scipy?
> [clip]
>> [1] http://tedlab.mit.edu/~dr/SVDLIBC/
>> [2] http://pypi.python.org/pypi/sparsesvd/
> I don't think that this will bring new compilation problems, as Scipy is
> probably already as bad as it gets.

Well there's no Fortran 90 :-)

> Dealing with CSR internally is probably not a bad thing --- svds() won't
> work with general linear operators either because it needs the transpose.

As long as there's still some routine in place that can work with 
operators; I usually have matrices that are not sparse but can still be 
multiplied with quickly from either side.

Dag Sverre

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