[jira] Commented: (MATH-351) SimplexSolver fails to solve feasible problem instance

["Luc Maisonobe (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MATH-351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12852489#action_12852489 ] 

Luc Maisonobe commented on MATH-351:
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Jurgen, your last comment on this issue is impossible to read, the images containing the equations are not inlined in the text (at least not with firefox on Linux). Could you rewrite it in simple raw text ?

Mark, do you agree to close the issue as invalid ?

> SimplexSolver fails to solve feasible problem instance 
> -------------------------------------------------------
>
>                 Key: MATH-351
>                 URL: https://issues.apache.org/jira/browse/MATH-351
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 2.0
>         Environment: Windows Vista Home Premium Version 6.0 Service Pack 1, Build 6001
>            Reporter: Mark Thomas
>             Fix For: 2.1
>
>         Attachments: image001.wmz, image017.gif, image018.wmz, image019.gif, image020.wmz, image021.gif, image022.wmz, image023.gif, image024.wmz, image025.gif, image026.wmz, image027.gif, image028.wmz, image029.gif, image030.wmz, image031.gif, oledata.mso, SimplexFail.xlsx, TestSimplexFail.java
>
>
> SimplexSolver throws an UnboundedSolutionException on a problem instance I can optimally solve with Excel's Solver. I've kept the parameters between the two programs the same as far as I can tell  (i.e. both have a precision/epsilon value of 1e-6 and a maxIterations value of 1000). I will attach a JUnit test  with an example problem on which SimplexSolver fails. I will also attach an Excel spreadsheet wtih the same data and successful Solver setup in place.
> I don't know a whole lot about linear programming or Simplex, but the problem I'm attempting to solve does appear to have a fairly sparse coefficient matrix, which may be part of the problem.
> It's surprisingly difficult to find a Java-based linear programming library, so I was ecstatic when I found this. Let me know how I can help!
> Thanks!

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