[Octave-bug-tracker] [bug #34173] Possible bug with multiplification with matrices and "-" sign

[Jordi Gutiérrez Hermoso]

Follow-up Comment #9, bug #34173 (project octave):

Btw, this is enough to reproduce it:


-Qq


It appears that Qq is a permutation matrix, which is stored sparsely, and
attempting to make it negative tries to cast it from a permutation matrix to a
full matrix, which is why you run out of memory.

The fix seems to be to make permutation matrices (an internal Octave type)
first attempt a cast into sparse matrices into full matrices. I'll look into
making this fix.

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