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

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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>

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

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

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