GNU Octave - Bugs: bug #66516, sparse matrix reverse indexing...

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bug #66516: sparse matrix reverse indexing broken

Submitter:	Liang Tang <lt1234>
Submitted:	Tue 03 Dec 2024 02:37:13 AM UTC


Category:	Interpreter	Severity:	4 - Important
Priority:	5 - Normal	Item Group:	Unexpected Error or Warning
Status:	Confirmed	Assigned to:	None
Originator Name:	lt1234	Open/Closed: *	Open
Release: *	9.2.0	Operating System: *	Any
Fixed Release:	None	Planned Release:	9.3.0

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Tue 03 Dec 2024 10:23:52 PM UTC, comment #1:

Confirmed.

Minimum working example simplified from original report

a = sparse (magic (3));
a(6:-1:4, 6:-1:4) = 100;

The sparse matrix is correctly expanded from 3x3 to 6x6, but then the assignment fails with the "nonconformant arguments" error.

Rik <rik5>

Tue 03 Dec 2024 02:37:13 AM UTC, original submission:

Sometime, reverse indexing of a matrix is needed. The small example below shows a particular case when reserve index might not work for sparse matrix.

a=sparse(randi(1, 30,30)); a(31:+1:60,31:+1:60)=a; whos a
a=full( randi(1, 30,30)); a(60:-1:31,60:-1:31)=a; whos a
a=sparse(randi(1, 30,30)); a(60:-1:31,60:-1:31)=a; % failed

error: =: nonconformant arguments (op1 is 30x30, op2 is 30x29)

Liang Tang <lt1234>

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Follow 6 latest changes.

Date	Changed by	Updated Field	Previous Value	Replaced by
2024-12-03	rik5	Operating System	Microsoft Windows	Any
		Planned Release	None	9.3.0
		Summary	One issue with sparse matrix reverse indexing	sparse matrix reverse indexing broken
2024-12-03	rik5	Category	Octave Function	Interpreter
		Severity	3 - Normal	4 - Important
		Status	None	Confirmed

GNU Octave - Bugs: bug #66516, sparse matrix reverse indexing...

bug #66516: sparse matrix reverse indexing broken

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