eigs using SuiteSparse

[David Bateman]

Ilan Boaz wrote:
>
>
> 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?
>
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.

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


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David Bateman                                dbateman at dbateman.org
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