[Octave-bug-tracker] [bug #47415] out of memory with factorized sparse matrix using mldivide

[Carlo de Falco]

Follow-up Comment #9, bug #47415 (project octave):

My last two posts don't show up correctly in the tracker
so I'm trying to post them again.

Octave 4.1


[l, u, p] = lu (A);
issparse (p)
ans = 0
issparse (-p)
ans = 0
-verbaitim-

Matlab


[l, u, p] = lu (A);
issparse (-p)
ans =
   1
issparse (p) 
ans =
   1
-verbaitim-



In Octave 3.8.1 I get:


octave:4> A = sprandn (10, 10, .4);
octave:5> [l, u, p] = lu (A);
octave:6> issparse (p)
ans = 0
octave:7> issparse (-p)
ans =  1
octave:8> version
ans = 3.8.1


this latter seems the most correct to me ...
is there a reason why it was changed?


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