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From "Luc Maisonobe (JIRA)" <>
Subject [jira] Commented: (MATH-351) SimplexSolver fails to solve feasible problem instance
Date Thu, 01 Apr 2010 18:21:27 GMT


Luc Maisonobe commented on MATH-351:

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:
>             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,
> 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
> 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
> 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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