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[Octave-bug-tracker] [bug #42177] Wrong second output argument for chol
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From: |
Marco Caliari |
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Subject: |
[Octave-bug-tracker] [bug #42177] Wrong second output argument for chol of a sparse matrix |
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Date: |
Thu, 24 Apr 2014 07:02:38 +0000 |
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User-agent: |
Mozilla/5.0 (X11; Linux i686; rv:13.0) Gecko/20100101 Firefox/13.0 |
Follow-up Comment #2, bug #42177 (project octave):
Hi Mike,
the result from Matlab is R=[1,1] (as in octave), but info == 2.
The help (both in Octave and Matlab) clearly says that if A is not positive
definite, then the second output argument is not 0 and this is a correct
behavior in my opinion. One uses R = chol (A) if thinks A is SPD. If not, he
should be warned. Then he can decide whether to use R or not.
What is misleading in the help of Octave is the use of P as second output
argument. It seems a permutation matrix. Matlab uses p, but why not to use
info?
Cheers,
Marco
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