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Re: Octave QR factorization
From: |
Ross Vandegrift |
Subject: |
Re: Octave QR factorization |
Date: |
Thu, 18 Dec 2003 14:55:40 -0500 |
User-agent: |
Mutt/1.3.28i |
On Wed, Dec 17, 2003 at 06:19:00PM -0600, John W. Eaton wrote:
> | The script does fail on my AMD Thunderbird, but I ignored the ATLAS
> | warnings and build with 3DNow - burning speed was more important to me
> | ::-)
>
> I remember using a 3DNow! version of lapack/blas on an Athlon and
> getting completely wrong results. Unfortunately I don't remember the
> details and I never tracked down the real cause. Maybe the problems I
> had have been fixed by now. OTOH, if you want answers fast and don't
> care whether they are right, I'm sure that I can write some code that
> will get them to you faster than ATLAS with 3DNow!
Hehe, not such a big deal - it was just for a course in numerical
analysis (what led me to Octave, actually). Any times when
numerical error, ill-conditioning, etc., were a problem, they were a
problem because the instructor wanted it that way and we had to be
smarter.
--
Ross Vandegrift
address@hidden
A Pope has a Water Cannon. It is a Water Cannon.
He fires Holy-Water from it. It is a Holy-Water Cannon.
He Blesses it. It is a Holy Holy-Water Cannon.
He Blesses the Hell out of it. It is a Wholly Holy Holy-Water Cannon.
He has it pierced. It is a Holey Wholly Holy Holy-Water Cannon.
He makes it official. It is a Canon Holey Wholly Holy Holy-Water Cannon.
Batman and Robin arrive. He shoots them.
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Re: Octave QR factorization, A S Hodel, 2003/12/17