bugGNU Octave - Bugs: bug #63069, qr fails on empty sparse matrix,...


bug #63069: qr fails on empty sparse matrix, but succeeds on empty full matrix

Submitter:  Liang Tang <lt1234>
Submitted:  Fri 16 Sep 2022 10:41:15 PM UTC
Category:  Octave Function Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Unexpected Error or Warning
Status:  Fixed Assigned to:  None
Originator Name:  lt1234 Open/Closed:  * Closed
Release:  * dev Operating System:  * Any
Fixed Release:  None Planned Release:  None
* Mandatory Fields

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Wed 05 Oct 2022 11:29:47 AM UTC, comment #4: 

Rik, thanks.  Currently I work around this issue by proving a near-zero X0 in lsqnonneg call.  I will remove the workaround in the next release. 

Liang Tang <lt1234>
Wed 05 Oct 2022 12:19:26 AM UTC, comment #3: 

I pushed a changeset for this here (http://hg.savannah.gnu.org/hgweb/octave/rev/fa4bb329a51a).  Marking as fixed and closing report.

Rik <rik5>
Project Administrator
Mon 19 Sep 2022 10:29:31 AM UTC, comment #2: 


Liang Tang <lt1234>
Mon 19 Sep 2022 05:08:34 AM UTC, comment #1: 

Re-titling to reflect the underlying problem.

This code works

qr ([])

This code fails

qr (sparse ([]))

Rik <rik5>
Project Administrator
Fri 16 Sep 2022 10:41:15 PM UTC, original submission:  

Error from using lsqnonneg with sparse matrix input(s). 

>> [X] = lsqnonneg (sparse([1 2;2 1]), [1 0]');

error: matrix dimension with negative or zero size
error: called from
    lsqnonneg at line 122 column 12

No error for full matrix inputs:

>> [X] = lsqnonneg (full([1 2;2 1]), [1 0]');


Liang Tang <lt1234>


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    Follow 6 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2022-10-05 rik5 StatusConfirmed Fixed
        Open/ClosedOpen Closed
    2022-09-19 rik5 StatusNone Confirmed
        Release7.1.0 dev
        Operating SystemMicrosoft Windows Any
        Summarylsqnonneg and sparse matrix compatibility qr fails on empty sparse matrix, but succeeds on empty full matrix

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