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

[John W. Eaton]

Follow-up Comment #16, bug #34173 (project octave):

AFAIK, Matlab doesn't have a special type for permutation matrices.  They are
always full.  You can disable Octave's special data type for them by using


disable_permuation_matrix (true);


This setting is enabled by default if you start Octave with the --traditional
option.

It would make Octave internals simpler if we just did this by default and
eliminated the special type.  Likewise for diagonal matrices and ranges (the
special data types for those may also be disabled).


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