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[Octave-bug-tracker] [bug #53390] lu factorization of large sparse matri
From: |
Marco Caliari |
Subject: |
[Octave-bug-tracker] [bug #53390] lu factorization of large sparse matrices often fails |
Date: |
Wed, 28 Mar 2018 02:49:06 -0400 (EDT) |
User-agent: |
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:59.0) Gecko/20100101 Firefox/59.0 |
Follow-up Comment #11, bug #53390 (project octave):
@Rik: this bug has always been in octave and it is due, in my opinion, to a
misleading documentation in umfpack (the author told me he will add a
clarifying note to the documentation). If it came up only now, it is because
people eihter do not use lu of sparse matrices or use it in the right way
([L,U,P,Q] = lu (S), maybe after noting that otherwise it fails). The proposal
in comment #9 will take some time and it is not feasible for 4.4.0. What about
adding sentence in the documentation? Something like
When called with two or three output arguments and a sparse input
matrix, 'lu' does not attempt to perform sparsity preserving column
permutations. Called with a fourth output argument, the sparsity preserving
column transformation Q is returned, such that 'P * A * Q = L * U'. This is
the preferred way to call lu with sparse input matrices.
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- [Octave-bug-tracker] [bug #53390] lu factorization of large sparse matrices often fails, (continued)
- [Octave-bug-tracker] [bug #53390] lu factorization of large sparse matrices often fails, Rik, 2018/03/20
- [Octave-bug-tracker] [bug #53390] lu factorization of large sparse matrices often fails, Marco Caliari, 2018/03/21
- [Octave-bug-tracker] [bug #53390] lu factorization of large sparse matrices often fails, Rik, 2018/03/21
- [Octave-bug-tracker] [bug #53390] lu factorization of large sparse matrices often fails, Marco Caliari, 2018/03/21
- [Octave-bug-tracker] [bug #53390] lu factorization of large sparse matrices often fails, Marco Caliari, 2018/03/22
- [Octave-bug-tracker] [bug #53390] lu factorization of large sparse matrices often fails, Rik, 2018/03/22
- [Octave-bug-tracker] [bug #53390] lu factorization of large sparse matrices often fails, Marco Caliari, 2018/03/23
- [Octave-bug-tracker] [bug #53390] lu factorization of large sparse matrices often fails, Marco Caliari, 2018/03/23
- [Octave-bug-tracker] [bug #53390] lu factorization of large sparse matrices often fails, Marco Caliari, 2018/03/23
- [Octave-bug-tracker] [bug #53390] lu factorization of large sparse matrices often fails, Rik, 2018/03/27
- [Octave-bug-tracker] [bug #53390] lu factorization of large sparse matrices often fails,
Marco Caliari <=
- [Octave-bug-tracker] [bug #53390] lu factorization of large sparse matrices often fails, Rik, 2018/03/28
- [Octave-bug-tracker] [bug #53390] lu factorization of large sparse matrices often fails, Rik, 2018/03/28
- [Octave-bug-tracker] [bug #53390] lu factorization of large sparse matrices often fails, Rik, 2018/03/28
- [Octave-bug-tracker] [bug #53390] lu factorization of large sparse matrices often fails, Marco Caliari, 2018/03/28
- [Octave-bug-tracker] [bug #53390] lu factorization of large sparse matrices often fails, Rik, 2018/03/28