[MATH-290] NullPointerException in SimplexTableau.initialize

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0
• Fix Version/s: 2.1

Environment

Java 1.6.0_13 on Windows XP 32-bit

• Assignee: Unassigned
• Reporter: Andrea
• Created: 25/Aug/09 10:53
• Updated: 14/Apr/10 00:27
• Resolved: 27/Aug/09 08:08

Description

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