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

[anonyme]

Follow-up Comment #18, bug #56232 (project octave):

Looking at
[https://github.com/PetterS/SuiteSparse/blob/master/UMFPACK/Source/umfpack_qsymbolic.c]
the code for qsymbolic contains the lines


    if (!Ai || !Ap || !SymbolicHandle)
    {
        Info [UMFPACK_STATUS] = UMFPACK_ERROR_argument_missing ;
        return (UMFPACK_ERROR_argument_missing) ;
    }


right at the top. So the null pointers in the column index causes UMFPACK to
fail. Sorry Rik, the at least the column index needs to be initialized, though
the data can be a null pointer

David


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