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[Octave-bug-tracker] [bug #34173] Unary negative casts permutation matri
From: |
Lachlan Andrew |
Subject: |
[Octave-bug-tracker] [bug #34173] Unary negative casts permutation matrices into full matrices |
Date: |
Wed, 15 Jun 2016 08:31:19 +0000 (UTC) |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:43.0) Gecko/20100101 Firefox/43.0 |
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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