bugGNU Octave - Bugs: bug #42587, chol incorrect claim about...

 
 

bug #42587: chol incorrect claim about positive definite on sparse indefinite matrix

Submitted by:  Johan Löfberg <johanlofberg>
Submitted on:  Thu 19 Jun 2014 11:30:16 AM UTC  
 
Category: Octave FunctionSeverity: 3 - Normal
Priority: 5 - NormalItem Group: Incorrect Result
Status: FixedAssigned to: None
Originator Name: Open/Closed: Closed
Release: 3.8.1Operating System: Microsoft Windows

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Thu 19 Jun 2014 05:05:40 PM UTC, comment #4:

I fixed this on the stable branch in this changeset (http://hg.savannah.gnu.org/hgweb/octave/rev/161b11e7da2d). It will be a part of the 3.8.2 bug fix release.

Incidentally, should the 3 output form work for full matrices, or does it only work with sparse?

If you can verify that Matlab handles this for full matrices then maybe a second bug report should be filed about that.

Rik <rik5>
Project Administrator
Thu 19 Jun 2014 11:40:14 AM UTC, comment #3:

I take that back, it has not been fixed. Too much allergy medicine today...

Johan Löfberg <johanlofberg>
Thu 19 Jun 2014 11:37:34 AM UTC, comment #2:

However, the example in the other report works on my machine as expected (p=2), so maybe something has been fixed, but not completely.

Johan Löfberg <johanlofberg>
Thu 19 Jun 2014 11:34:14 AM UTC, comment #1:

Sorry, missed that it was reported already in https://savannah.gnu.org/bugs/?func=detailitem&item_id=42177

Johan Löfberg <johanlofberg>
Thu 19 Jun 2014 11:30:16 AM UTC, original submission:

The following sequence show a case were an obviously indefinite matrix is claimed successfully factorized in chol (p=0), when two output arguments are used.

Johan Löfberg <johanlofberg>

 

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    Follow 2 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Thu 19 Jun 2014 05:05:40 PM UTCrik5StatusNone=>Fixed
      Open/ClosedOpen=>Closed

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