[Octave-bug-tracker] [bug #47415] out of memory negating a permutation matrix

[Lachlan Andrew]

Follow-up Comment #22, bug #47415 (project octave):

That is true, Carlo, but it introduces a clear incompatibility with Matlab.

If a user creates a full matrix, and Octave converts that to a permutation
matrix, and then to a sparse matrix, what happens when the user tries an
operation that is valid only for full matrices (like assigning to a third
dimension)?

In Matlab, the operation would succeed because the matrices would always be
full.

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