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

[John W. Eaton]

Follow-up Comment #32, bug #56232 (project octave):

I'm not worried about the allocations and it seems like always having valid
arrays will make the implementation simpler for the mex interface and for
calling suitesparse functions.

Making the minimum value for nzmax 1 also seems fine, and if that's what
Matlab does, there may be code that relies on it so we might as well do the
same.

For the problem with inverse, I guess we just need to fix
SparseMatrix::tinverse to generate +/-Inf and NaN values instead of reporting
division by zero.  I looked at it and am hopeful that someone else understands
that code and the sparse data structure better than I do.

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