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## [Octave-bug-tracker] [bug #53140] Solution of a system of linear equatio

**From**: |
John W. Eaton |

**Subject**: |
[Octave-bug-tracker] [bug #53140] Solution of a system of linear equations takes forever and hurts OS performance. |

**Date**: |
Tue, 13 Feb 2018 16:09:33 -0500 (EST) |

**User-agent**: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0 |

Follow-up Comment #3, bug #53140 (project octave):
If someone would like to understand this problem, the place to start is
probably the xleftdiv function in libinterp/corefcn/sparse-xdiv.cc. From
there, verify that the arguments to the SparseMatrix::solve function are the
same in both 4.2.1 and dev. From there, you should end up in the
SparseMatrix::fsolve function that takes a SparseMatrix B array. As far as I
can tell, there are no significant changes in that function between 4.2.1 and
dev.
If the inputs to SparseMatrix::fsolve are the same for both versions, then why
does it in 4.2.1 take so much longer than the current one in the dev sources?
If the inputs are different, then you'll have to find out why.
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**[Octave-bug-tracker] [bug #53140] Solution of a system of linear equations takes forever and hurts OS performance.**, *anonymous*, `2018/02/13`
**[Octave-bug-tracker] [bug #53140] Solution of a system of linear equations takes forever and hurts OS performance.**, *Rik*, `2018/02/13`
**[Octave-bug-tracker] [bug #53140] Solution of a system of linear equations takes forever and hurts OS performance.**, *Rik*, `2018/02/13`
**[Octave-bug-tracker] [bug #53140] Solution of a system of linear equations takes forever and hurts OS performance.**,
*John W. Eaton* **<=**
**[Octave-bug-tracker] [bug #53140] Solution of a system of linear equations takes forever and hurts OS performance.**, *John W. Eaton*, `2018/02/13`
**[Octave-bug-tracker] [bug #53140] Solution of a system of linear equations takes forever and hurts OS performance.**, *Rik*, `2018/02/13`
**[Octave-bug-tracker] [bug #53140] Solution of a system of linear equations takes forever and hurts OS performance.**, *Marco Caliari*, `2018/02/14`
**[Octave-bug-tracker] [bug #53140] Solution of a system of linear equations takes forever and hurts OS performance.**, *Marco Caliari*, `2018/02/15`
**[Octave-bug-tracker] [bug #53140] Solution of a system of linear equations takes forever and hurts OS performance.**, *Rik*, `2018/02/15`
**[Octave-bug-tracker] [bug #53140] Solution of a system of linear equations takes forever and hurts OS performance.**, *Marco Caliari*, `2018/02/16`
**[Octave-bug-tracker] [bug #53140] Solution of a system of linear equations takes forever and hurts OS performance.**, *Rik*, `2018/02/18`
**[Octave-bug-tracker] [bug #53140] Solution of a system of linear equations takes forever and hurts OS performance.**, *Marco Caliari*, `2018/02/19`
**[Octave-bug-tracker] [bug #53140] Solution of a system of linear equations takes forever and hurts OS performance.**, *Rik*, `2018/02/19`
**[Octave-bug-tracker] [bug #53140] Solution of a system of linear equations takes forever and hurts OS performance.**, *Rik*, `2018/02/19`