[Octave-bug-tracker] [bug #63155] qr() returns a full matrix for Q output for sparse input

[Rik]

URL:
  <https://savannah.gnu.org/bugs/?63155>

                 Summary: qr() returns a full matrix for Q output for sparse
input
                 Project: GNU Octave
               Submitter: rik5
               Submitted: Tue 04 Oct 2022 05:24:02 PM PDT
                Category: Octave Function
                Severity: 2 - Minor
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: Confirmed
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: dev
         Discussion Lock: Any
        Operating System: Any


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Follow-up Comments:


-------------------------------------------------------
Date: Tue 04 Oct 2022 05:24:02 PM PDT By: Rik <rik5>
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.







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