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From: | David Bateman |
Subject: | Re: eigs using SuiteSparse |
Date: | Mon, 13 Oct 2008 08:53:33 +0100 |
User-agent: | Mozilla-Thunderbird 2.0.0.16 (X11/20080724) |
Ilan Boaz wrote:
Octave is currently using cxsparse for the sparse QR and over-determined, under-determined and rank-deficient solvers, though I don't think I'd call their use as an "override" of these functions. We should use the new QR code in SuiteSparse instead due to the massive speed improvements in this code.You mean suitesparse should override the default commands? So with suitesparse, which commands provide the rapid qr and mldivide? Does suitesparse provide klu (a rapid lu) as well?
As for klu, we can not use it. KLU is for a particular class of matrices which arises in circuit simulations, and it makes use of the matrix structure of this class of problem. It is not a general LU solver, and so it can't be used by Octave for the commands requiring an LU decomposition as Octave can not make the assumptions that KLU does.
Regards David -- David Bateman address@hidden 35 rue Gambetta +33 1 46 04 02 18 (Home) 92100 Boulogne-Billancourt FRANCE +33 6 72 01 06 33 (Mob)
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