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

[anonyme]

Follow-up Comment #20, bug #56232 (project octave):

Here is another interesting data point


>> [L,U,P,Q] = lu(sparse([],[],[],2,2,1))
L =

Compressed Column Sparse (rows = 2, cols = 2, nnz = 2 [50%])

  (1, 1) ->  1
  (2, 2) ->  1

U =

Compressed Column Sparse (rows = 2, cols = 2, nnz = 0 [0%])


P =

Permutation Matrix

   1   0
   0   1

Q =

Permutation Matrix

   0   1
   1   0


I use the value of NZMAX (set to 1) to create a sparse matrix that although it
is empty has valid row, col et data indexes and LU returns a valid
factorization. So again setting the sparse column et data indices to a null
pointer is not the right thing to do. 

David


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