bugGNU Octave - Bugs: bug #63155, qr() returns a full matrix for Q...

 
 

bug #63155: qr() returns a full matrix for Q output for sparse input

Submitter:  Rik <rik5>
Submitted:  Wed 05 Oct 2022 12:24:02 AM UTC
 
Category:  Octave Function Severity:  2 - Minor
Priority:  5 - Normal Item Group:  Matlab Compatibility
Status:  Confirmed Assigned to:  None
Originator Name:  Open/Closed:  * Open
Release:  * dev Operating System:  * Any
Fixed Release:  None Planned Release:  None
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Wed 05 Oct 2022 12:24:02 AM UTC, original submission:  

Sample code:

[Q,R] = qr (sparse (magic (3)))
Q =

  -0.847998   0.522292   0.090055
  -0.317999  -0.365468  -0.874820
  -0.423999  -0.770483   0.476005

R =

Compressed Column Sparse (rows = 3, cols = 3, nnz = 6 [67%])

  (1, 1) -> -9.4340
  (1, 2) -> -6.2540
  (2, 2) -> -8.2394
  (1, 3) -> -8.1620
  (2, 3) -> -0.9655
  (3, 3) -> -4.6314

Matlab returns sparse matrices for both Q and R when the input is sparse.

Rik <rik5>
Project Administrator

 

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