[Octave-bug-tracker] [bug #34173] Unary negative casts permutation matrices into full matrices

[Lachlan Andrew]

Follow-up Comment #13, bug #34173 (project octave):

Is this really a bug?

In terms of Matlab compatibility, is there any sequence of instruction that
produces a permutation matrix where Matlab doesn't produce a full matrix?  If
not, then the behaviour is entirely up to us.

If the programmer wants a sparse matrix, it is easy to convert to sparse
before negating.  They can't want a permutation matrix if it is negative.

Unless there is a Matlab compatibility issue, I would vote for documenting
this behaviour and leaving it as-is.

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