bugGNU Octave - Bugs: bug #34800, mldivide(sparse, ...) returns NULL...

 
 

bug #34800: mldivide(sparse, ...) returns NULL in least-squares case

Submitted by:  None
Submitted on:  Fri 11 Nov 2011 11:00:21 AM UTC  
 
Category: InterpreterSeverity: 3 - Normal
Priority: 5 - NormalItem Group: Incorrect Result
Status: FixedAssigned to: None
Originator Name: Alex SuykovOriginator Email: -unavailable-
Open/Closed: ClosedRelease: 3.4.3
Operating System: GNU/Linux

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Thu 17 Nov 2011 03:43:39 AM UTC, comment #1:

Happily, this has been fixed on the development branch. To access the fix you can build from Mercurial sources or wait for the 3.6.0 release (3.6.0) scheduled for December 2011. Given that the next release is approaching I think it unlikely that the fix will be backported to the 3.4.X branch.

Rik <rik5>
Project Administrator
Fri 11 Nov 2011 11:00:21 AM UTC, original submission:

Found this while trying to run SeDuMi 1.3 in Octave. I can't check it against Matlab, but it certainly doesn't look right.

Simple test file attached. Expected result is xs = xm = [ 1.5; 0; 0 ]. Actual result is xs = [](0x0), while xm gets the correct value. This is Example 3 from http://www.mathworks.com/help/techdoc/ref/mldivide.html .

mrdivide is affected as well.

Anonymous

 

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    Follow 3 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Wed 23 Nov 2011 04:19:10 AM UTCrik5Open/ClosedOpen=>Closed
    Thu 17 Nov 2011 03:43:39 AM UTCrik5StatusNone=>Fixed
    Fri 11 Nov 2011 11:00:21 AM UTCNoneAttached File-=>Added mldivide-sparse-err.m, #24351

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