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From: | Joe Koski |
Subject: | Re: chol? |
Date: | Sat, 15 Apr 2006 14:53:18 -0600 |
User-agent: | Microsoft-Entourage/11.2.3.060209 |
Vic,
Is this the port from hpc.sf.net, or did you compile from source?
I have yet to get a working build of octave 2.1.73 on the Mac.
On Apr 15, 2006, at 3:16 PM, Vic Norton wrote:
I had thought Octave, version 2.1.73, was working fine on my iMac G5,
but now I'm not so sure. Here's my problem.
I start with the matrix
octave> C = [36 24; 24 25];
and do
octave> chol(C);
After waiting for a while I get
panic: Bus error -- stopping myself...
attempting to save variables to `octave-core'...
save to `octave-core' complete
Bus error
vic$
To tell you the truth I'm not sure what the Cholesky factor of C is
supposed to be. I do know that C = R' * R where
R = [0 3; 6 4].
I have no problem computing another R that does this job:
octave> C = [36 24; 24 25];
octave> [U, S, V] = svd(C);
octave> R = sqrt(S) * V';
Now
R = [
-5.8067 -4.6265
-1.5108 1.8962
]
and C = R' * R for this R as well. But R = chol(C) simply doesn't work
for me.
Is anybody else having any problems with "chol" or is it just my screwed
up system?
Regards,
Vic
Marius
--
Marius Schamschula Webmaster
The Huntsville Macintosh Users Group
www.hmug.org <http://www.hmug.org>
webmaster at hmug dot org marius at schamschula dot com
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