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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: |
Tue, 20 Mar 2018 11:27:32 -0400 (EDT) |
User-agent: |
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:59.0) Gecko/20100101 Firefox/59.0 |
URL:
<http://savannah.gnu.org/bugs/?53390>
Summary: lu factorization of large sparse matrices often
fails
Project: GNU Octave
Submitted by: caliari
Submitted on: Tue 20 Mar 2018 03:27:30 PM UTC
Category: Octave Function
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: Unexpected Error
Status: None
Assigned to: None
Originator Name:
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Release: dev
Operating System: GNU/Linux
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Details:
If you try
S = sprand (1000, 1000, 1 / 1000);
[L, U] = lu (S);
quite often you get
error: lu: sparse_lu: numeric factorization failed
If you check the value of status around line 730 of sparse-lu.cc, you find it
is -11 which means (umfpack_numeric.h, umfpack.h)
The pattern (Ap and/or Ai) has changed since the call to
umfpack_*_*symbolic which produced the Symbolic object.
I don't see why it should have changed.
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?53390>
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- [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, 2018/03/20
- [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