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From "Andrea (JIRA)" <j...@apache.org>
Subject [jira] Created: (MATH-290) NullPointerException in SimplexTableau.initialize
Date Tue, 25 Aug 2009 10:53:59 GMT
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


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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