Re: Octave QR factorization

[Ross Vandegrift]

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

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