[Octave-bug-tracker] [bug #66488] qr( sparse, 0) isn't equal to qr( sparse, 'vector')

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?66488>

                 Summary: qr( sparse, 0) isn't equal to qr( sparse, 'vector')
                   Group: GNU Octave
               Submitter: None
               Submitted: Thu 28 Nov 2024 01:52:53 AM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Andy Adler
        Originator Email: adler@sce.carleton.ca
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 9.2.0
        Operating System: GNU/Linux
           Fixed Release: None
         Planned Release: None


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Follow-up Comments:


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Date: Thu 28 Nov 2024 01:52:53 AM UTC By: Anonymous
qr( ...,0) should be equal to qr( ..., 'vector'). 
But we have
 [q,r,p]= qr(speye(3),'vector'); size(p) % 3x1, but matlab is 1x3
 [q,r,p]= qr(speye(3),0); size(p)        % 3x3, but matlab is 1x3
However, this is OK for non-sparse qr
 [q,r,p]= qr(eye(3),'vector'); size(p) % 3x1, correct
 [q,r,p]= qr(eye(3),0); size(p)        % 3x1, correct
Tests in octave 9.2:
 [q,r,p]= qr(speye(3)); % correct
 [q,r,p]= qr(eye(3)); % correct








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