bugGNU Octave - Bugs: bug #53823, svd for fat single complex...

 
 

bug #53823: svd for fat single complex matrices crashes octave

Submitter:  Marco Caliari <caliari>
Submitted:  Thu 03 May 2018 02:53:45 PM UTC
   
 
Category:  Octave Function Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Segfault, Bus Error, etc.
Status:  Fixed Assigned to:  None
Originator Name:  Open/Closed:  * Closed
Release:  * 4.4.0 Operating System:  * GNU/Linux
Fixed Release:  None Planned Release:  None
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Fri 04 May 2018 04:16:13 AM UTC, comment #1: 

I pushed your change to the stable branch here: http://hg.savannah.gnu.org/hgweb/octave/rev/a8a4b6e6e754.

I modified the commit message to include the bug number in the summary.

Rik <rik5>
Group administrator
Thu 03 May 2018 02:53:45 PM UTC, original submission:  

As reported in the maintainers mailing list


svd(single(randn(30,50) + i*randn(30,50)))


crashes octave. The problem is with the dimension of lrwork. As written here

https://github.com/Reference-LAPACK/lapack/blob/master/SRC/cgesdd.f

and

https://github.com/Reference-LAPACK/lapack/blob/master/SRC/zgesdd.f

LAPACK <= 3.6 (which is not so old) has a bug and requires lrwork = 7*min_mn.
The attached changeset fixes the problem for me.

Marco Caliari <caliari>
Group Member

 

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Attached Files
file #44076:  svd.diff added by caliari (1KiB - application/x-tex)

 

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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2018-05-04 rik5 StatusPatch Submitted Fixed
        Open/ClosedOpen Closed
    2018-05-03 caliari Attached File- Added svd.diff, #44076

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