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Re: New procedure bicgstab


From: David Bateman
Subject: Re: New procedure bicgstab
Date: Mon, 22 Dec 2008 21:33:33 +0100
User-agent: Mozilla-Thunderbird 2.0.0.17 (X11/20081018)

Jaroslav Hajek wrote:
On Mon, Dec 22, 2008 at 2:02 PM, Søren Hauberg <address@hidden> wrote:
man, 22 12 2008 kl. 11:05 +0100, skrev Jaroslav Hajek:
On Mon, Dec 22, 2008 at 10:14 AM, R! <address@hidden> wrote:
Hi,

I understand that good preconditioning is very important for procedure like
bicgstab and cgs which I wrote, so maybe I can now try to write ILU
procedure for Octave if you find it useful.

But I'm also interested in your opinion about bicgstab now.

Certainly it's useful. Not even in the sparse world is every matrix
ill-conditioned.
The Krylov solvers are IMHO an important missing piece in Octave. It's
great someone took up the job. Even not-quite-optimized
implementations are a good take-off.
Having gmres would be great, too.
Where should we put stuff like this? The 'optimization' package is
option.


Radek's previous cgs contribution went into script/sparse/ and I guess it fits.

That is where matlab puts them... I don't have much time to deal with reviewing and adding this code to Octave.. It should go in the core as it is a core matlab function...

D.



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David Bateman                                address@hidden
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