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[Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty s
From: |
Marco Caliari |
Subject: |
[Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix. |
Date: |
Wed, 8 May 2019 08:19:09 -0400 (EDT) |
User-agent: |
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:66.0) Gecko/20100101 Firefox/66.0 |
Follow-up Comment #34, bug #56232 (project octave):
For a sparse singular matrix, it is not clear to me what matlab does:
>> inv(sparse([1,0;1,0]))
Warning: Matrix is singular to working precision.
ans =
(1,1) 1
(2,1) -Inf
(2,2) Inf
>> inv(sparse([1,2;0,0]))
Warning: Matrix is singular to working precision.
ans =
(1,1) NaN
(2,1) NaN
(1,2) -Inf
(2,2) Inf
For the same examples, in the full form, matlab gives a matrix of Inf. The
same does octave. I would suggest that octave gives a sparse matrix of Inf.
There are five cases in which tinverse gives the division by zero error. It
should be enough to modify them in such a way that a sparse matrix of Inf is
returned.
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- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix., (continued)
- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix., Rik, 2019/05/07
- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix., Rik, 2019/05/07
- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix., Marco Caliari, 2019/05/07
- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix., Rik, 2019/05/07
- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix., John W. Eaton, 2019/05/07
- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix., Rik, 2019/05/07
- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix., Rik, 2019/05/07
- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix., Marco Caliari, 2019/05/08
- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix., John W. Eaton, 2019/05/08
- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix., Marco Caliari, 2019/05/08
- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix.,
Marco Caliari <=
- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix., John W. Eaton, 2019/05/08
- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix., Marco Caliari, 2019/05/08
- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix., John W. Eaton, 2019/05/08
- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix., Marco Caliari, 2019/05/08
- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix., John W. Eaton, 2019/05/08
- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix., John W. Eaton, 2019/05/08
- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix., Rik, 2019/05/08
- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix., Rik, 2019/05/08
- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix., John W. Eaton, 2019/05/08
- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix., Marco Caliari, 2019/05/08