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

[Marco Caliari]

Follow-up Comment #16, bug #56232 (project octave):

@Rik: your patch fixes the problem with inv, but I think that the source of
the problem is the LU factorization of a sparse null matrix. The result should
be


>> [L, U, P, Q] = umfpack (sparse (2, 2, 0))

L =

   (1,1)        1
   (2,2)        1


U =

   All zero sparse: 2×2


P =

   (1,1)        1
   (2,2)        1


Q =

   (2,1)        1
   (1,2)        1


Here umfpack () is the mex interface of UMFPACK, run in matlab. So, it seems
that UMFPACK is able to compute the factorization of a sparse null matrix, but
not in octave. I fear that your patch may hide the true source of troubles.

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