From help-request at octave dot org Sat Apr 15 20:33:51 2006
Subject: Re: chol?
From: Joe Koski <jkoski11 at comcast dot net>
To: Vic Norton <vic at norton dot name>, <dastew@sympatico.ca>
CC: Octave Help <help at octave dot org>
Date: Sat, 15 Apr 2006 19:32:05 -0600

on 4/15/06 7:21 PM, Vic Norton at vic at norton dot name wrote:

> Well thanks Doug, Joe, Marius, Jordi, ...
> 
> Now I know it's my screwed up system. I love Macintoshes, but I hate
> their incompatibilty with the real world.
> 
> And now I remember what the Cholesky factor is. You start with an inner
> product and an arbitrary basis and construct an orthogonal basis from
> that. The first orthogonal vector is a multiple of the first basis
> vector. The second orthogonal vector a linear combination of the first
> two basis vectors, etc. The Choleksy factor is produced by choosing the
> standard delta-ij basis to start with.
> 
> Oh well, at least the Octave stuff that is important to me does work on
> my system.
> 
> Regards,
> 
> Vic
> 
Vic,

At least there's hope. Gaurav Khanna reported that when he built
octave-2.1.73, etc. on an Intel Mac with OS X 10.4.6, all went well. Now we
just need to nag Apple to get the G5 version of 10.4.6 working correctly.

Joe


> On 4/15/06, at 5:35 PM -0400, dastew at sympatico dot ca wrote:
>> octave:1> C = [36 24; 24 25];
>> octave:2> C
>> C =
>> 
>>   36  24
>>   24  25
>> 
>> octave:3> 
>> octave:3> chol(C)
>> ans =
>> 
>>   6  4
>>   0  3
>> Upper Triangular
> 
> On 4/15/06, at 4:16 PM -0400, Vic Norton wrote:
>> 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$
> 
> 
> 
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Octave is freely available under the terms of the GNU GPL.

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