[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Octave-bug-tracker] [bug #41116] Incorrect result for sparse LU factori
From: |
Michael C. Grant |
Subject: |
[Octave-bug-tracker] [bug #41116] Incorrect result for sparse LU factorization |
Date: |
Mon, 13 Jan 2014 20:26:53 +0000 |
User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36 |
Follow-up Comment #7, bug #41116 (project octave):
I now suspect that MATLAB does not use UMFPACK for LU factorization when
nargout=1,2, or 3. I don't think you *can* use UMFPACK in those cases.
It looks like UMFPACK reserves the right to do column reordering during
numerical factorization, even if you force a fixed column ordering during
symbolic factorization. I see no way to disable that.
If I am right, it is not possible to duplicate MATLAB functionality for
nargout=1,2,3 without replacing UMFPACK with something else; say, SuperLU.
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?41116>
_______________________________________________
Message sent via/by Savannah
http://savannah.gnu.org/
- [Octave-bug-tracker] [bug #41116] Incorrect result for sparse LU factorization, anonymous, 2014/01/05
- [Octave-bug-tracker] [bug #41116] Incorrect result for sparse LU factorization, John W. Eaton, 2014/01/05
- [Octave-bug-tracker] [bug #41116] Incorrect result for sparse LU factorization, Michael C. Grant, 2014/01/05
- [Octave-bug-tracker] [bug #41116] Incorrect result for sparse LU factorization, Michael C. Grant, 2014/01/06
- [Octave-bug-tracker] [bug #41116] Incorrect result for sparse LU factorization, Marco Caliari, 2014/01/09
- [Octave-bug-tracker] [bug #41116] Incorrect result for sparse LU factorization, Michael C. Grant, 2014/01/09
- [Octave-bug-tracker] [bug #41116] Incorrect result for sparse LU factorization, Michael C. Grant, 2014/01/13
- [Octave-bug-tracker] [bug #41116] Incorrect result for sparse LU factorization,
Michael C. Grant <=
- [Octave-bug-tracker] [bug #41116] Incorrect result for sparse LU factorization, Marco Caliari, 2014/01/14
- [Octave-bug-tracker] [bug #41116] Incorrect result for sparse LU factorization, Marco Caliari, 2014/01/14
- [Octave-bug-tracker] [bug #41116] Incorrect result for sparse LU factorization, Michael C. Grant, 2014/01/14
- [Octave-bug-tracker] [bug #41116] Incorrect result for sparse LU factorization, Marco Caliari, 2014/01/14
- [Octave-bug-tracker] [bug #41116] Incorrect result for sparse LU factorization, Michael C. Grant, 2014/01/14
- [Octave-bug-tracker] [bug #41116] Incorrect result for sparse LU factorization, Michael C. Grant, 2014/01/15
- [Octave-bug-tracker] [bug #41116] Incorrect result for sparse LU factorization, Michael C. Grant, 2014/01/15
- [Octave-bug-tracker] [bug #41116] Incorrect result for sparse LU factorization, Michael C. Grant, 2014/01/16
- [Octave-bug-tracker] [bug #41116] Incorrect result for sparse LU factorization, Michael C. Grant, 2014/01/23
- [Octave-bug-tracker] [bug #41116] Incorrect result for sparse LU factorization, Michael Godfrey, 2014/01/23