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[Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty s
From: |
Rik |
Subject: |
[Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix. |
Date: |
Tue, 7 May 2019 17:56:53 -0400 (EDT) |
User-agent: |
Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko |
Follow-up Comment #29, bug #56232 (project octave):
@jwe: This was the approach I was trying to avoid since it requires three
changes instead of one, and the overhead of managing small blocks on the heap
(https://stackoverflow.com/questions/1087042/c-new-int0-will-it-allocate-memory).
But, if it will make the implementation of the mex interface simpler we could
do it. Since Matlab's documentation is often only loosely coupled to its
behavior, we should verify with a sample mex program, that mxGetJc really does
return a valid pointer for an empty sparse array.
Attached is a patch that modifies the sparse constructors, but uses C++11
aggregate value initialization '{}' in the mem-init rather than writing a
constructor to which uses std::fill_n. It makes for shorter code without, I
think, any loss of clarity.
Regardless, with either patch applied, I get
error: inv: division by zero
error: called from
tst_inv at line 3 column 1
when trying to take the inverse of an empty matrix.
(file #46879)
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File name: sparse_constructor.diffs Size:1 KB
<https://savannah.gnu.org/file/sparse_constructor.diffs?file_id=46879>
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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., Marco Caliari, 2019/05/07
- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix., anonyme, 2019/05/07
- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix., anonyme, 2019/05/07
- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix., anonyme, 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., 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 <=
- [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, 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., Marco Caliari, 2019/05/08
- [Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix., John W. Eaton, 2019/05/08