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From "Raghu Rangarajan (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (MATH-819) SimplexSolver - InfeasibleSolution when feasible
Date Fri, 13 Jul 2012 10:44:34 GMT

    [ https://issues.apache.org/jira/browse/MATH-819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13413643#comment-13413643
] 

Raghu Rangarajan edited comment on MATH-819 at 7/13/12 10:42 AM:
-----------------------------------------------------------------

Hi Thomas,

I will check out Octave. But glpk is able to solve this problem with those large coeffs. I
used the standalone solver (glpsol) that comes with glpk. I have attached the input, output
and solution files (test.*) for the same problem. Please look into it. 

Also please tell me if there is a way to specify "no bounds" for lower and upper bounds for
a variable and if that would help the solver. We specify +/-1e10 for those in LinearConstraints
since we don't know better.

Again, thanks for looking into this issue.

--
Raghu
                
      was (Author: vidyaraghu):
    Hi Thomas,

I will check out Octave. But glpk is able to solve this problem with those large coeffs. I
used the standalone solver (glpsol) that comes with glpk. I have attached the input, output
and solution files (test.*) for the same problem. Please look into it. 

Again, thanks for looking into this issue.

--
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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