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[Octave-bug-tracker] [bug #41116] Incorrect result for sparse LU factori

From: Marco Caliari
Subject: [Octave-bug-tracker] [bug #41116] Incorrect result for sparse LU factorization
Date: Tue, 14 Jan 2014 08:34:34 +0000
User-agent: Mozilla/5.0 (X11; Linux i686; rv:13.0) Gecko/20100101 Firefox/13.0

Follow-up Comment #9, bug #41116 (project octave):

Sorry, I rewrite

Dear Michael,


makes no column permutation: in fact LL2*UU2=x, without any Q matrix.
With the workaround I suggested, I get from


exactly the same (correct) factorization, that is no column permutation in
final result. It seems to me that the column reordering we see between the
symbolic and the numerical factorization in UMFPACK is a sort of "inner"
reordering that we have to take into account, but without a real column
permutation (that is Q different from identity) in the result.



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