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From "Raghu Rangarajan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-819) SimplexSolver - InfeasibleSolution when feasible
Date Sun, 15 Jul 2012 12:24:36 GMT

    [ https://issues.apache.org/jira/browse/MATH-819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13414621#comment-13414621
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Raghu Rangarajan commented on MATH-819:
---------------------------------------

Hi Thomas,

I will try to skip adding such constraints as much as possible. 

You mention that variables without any specified bounds may take values in the range [0, infinity].
Am I correct to assume that such variables could take values from -infinity to infinity if
I call the SimplexSolver.optimize method with restrictToNonNegative set to false? Sorry if
I am asking for clarification on something that is obvious. Thanks.

--
Raghu
                
> 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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