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From "Thomas Neidhart (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-819) SimplexSolver - InfeasibleSolution when feasible
Date Mon, 11 Mar 2013 09:11:13 GMT

    [ https://issues.apache.org/jira/browse/MATH-819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13598658#comment-13598658
] 

Thomas Neidhart commented on MATH-819:
--------------------------------------

Ok, but keep in mind that you have to use the SimplexSolver in the new optim package. The
whole optimization package has been refactored so a few things have changed, but the principle
is the same of course.

Also this change will only be available from the 3.2 release, or you can test with the latest
trunk of course.
                
> SimplexSolver - InfeasibleSolution when feasible
> ------------------------------------------------
>
>                 Key: MATH-819
>                 URL: https://issues.apache.org/jira/browse/MATH-819
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 3.1
>         Environment: Windows 7, JDK 1.7.0_03
>            Reporter: Raghu Rangarajan
>            Assignee: Thomas Neidhart
>             Fix For: 3.2
>
>         Attachments: CommonsSolver2.java, lp-octave.txt, test.log, test.mod, test.out
>
>
> I am seeing an odd behavior with the latest code in the main trunk (Directory revision:
1358535). The solver throws "NoFeasibleSolutionException" for a problem which has a feasible
solution. Just by commenting out the last constraint, we get a feasible solution. And for
that solution, the constraint in question does not seem to be playing a role. 

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