[Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix.

[Rik]

Follow-up Comment #42, bug #56232 (project octave):

I think we can begin to proceed on resolving some parts of this bug.  I
believe all of these changes should go on the dev branch.  An open question is
whether we want to backport something minimal just to stop the segfault in
5.1.0.  That seems useful as the interpreter shouldn't segfault (losing user
variables) for innocuous, valid inputs like C - C.

The first part of the fix on dev is a move to maintaining memory at all times
for at least one element.  This will ensure valid data, ridx, and cidx
pointers at all times.  Any routine which sets nzmax needs to ensure that a
value of 0 is replaced with a value of 1.



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