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[Octave-bug-tracker] [bug #42177] Wrong second output argument for chol
From: |
Marco Caliari |
Subject: |
[Octave-bug-tracker] [bug #42177] Wrong second output argument for chol of a sparse matrix |
Date: |
Fri, 30 Jan 2015 16:00:35 +0000 |
User-agent: |
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0 |
Update of bug #42177 (project octave):
Item Group: Incorrect Result => Matlab Compatibility
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Follow-up Comment #4:
I just noticed that, although not written in the help, for the full case it
seems true that if info is not zero, then
R(1:info-1,1:info-1)'*R(1:info-1,1:info-1) == A(1:info-1,1:info-1)
(as written in Matlab help), whereas in the sparse case, if A is not SPD, than
info is always 1. So, now it is a simpler not compatible behavior.
Marco
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