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From "Thomas Neidhart (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-819) SimplexSolver - InfeasibleSolution when feasible
Date Sun, 15 Jul 2012 15:53:34 GMT

    [ https://issues.apache.org/jira/browse/MATH-819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13414680#comment-13414680
] 

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

Hi Raghu,

the short answer is yes. In theory it will be in the range [Double.MIN_VALUE, Double.MAX_VALUE],
but in practice it will be limited by many more things and depend on your problem definition
of course.

Thomas
                
> 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
>         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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