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From "Benjamin McCann (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (MATH-290) NullPointerException in SimplexTableau.initialize
Date Wed, 26 Aug 2009 15:51:59 GMT

    [ https://issues.apache.org/jira/browse/MATH-290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12747993#action_12747993
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Benjamin McCann edited comment on MATH-290 at 8/26/09 8:50 AM:
---------------------------------------------------------------

You originally wrote >= in the constraint and now you're writing <=.  Perhaps that's
where the confusion is?  The answer is 0 when you use <=.

      was (Author: bmccann):
    You originally wrote >= in the constraint and now you're writing <=.  Perhaps that's
where the confusion is?  The answer is 0 when you use <-/
  
> NullPointerException in SimplexTableau.initialize
> -------------------------------------------------
>
>                 Key: MATH-290
>                 URL: https://issues.apache.org/jira/browse/MATH-290
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 2.0
>         Environment: Java 1.6.0_13 on Windows XP 32-bit 
>            Reporter: Andrea
>         Attachments: SimplexSolverTest.patch, SimplexTableau.patch
>
>
> SimplexTableau throws a NullPointerException when no solution can be found instead of
a NoFeasibleSolutionException
> Here is the code that causes the NullPointerException:
> LinearObjectiveFunction f = new LinearObjectiveFunction(new double[] { 1, 5 }, 0 );
> Collection<LinearConstraint> constraints = new ArrayList<LinearConstraint>();
> constraints.add(new LinearConstraint(new double[] { 2, 0 }, Relationship.GEQ, -1.0));
> RealPointValuePair solution = new SimplexSolver().optimize(f, constraints, GoalType.MINIMIZE,
true);
> Note: Tested both with Apache Commons Math 2.0 release and SVN trunk

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