Negative value with restrictNonNegative
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Key: MATH-713
URL: https://issues.apache.org/jira/browse/MATH-713
Project: Commons Math
Issue Type: Bug
Affects Versions: 2.2
Environment: commons-math-2.2
Reporter: Michał Skrzypczak
Problem: commons-math-2.2 SimplexSolver.
A variable with 0 coefficient may be assigned a negative value nevertheless
restrictToNonnegative flag in call:
SimplexSolver.optimize(function, constraints, GoalType.MINIMIZE, true);
Function
1 * x + 1 * y + 0
Constraints:
1 * x + 0 * y = 1
Result:
x = 1; y = -1;
Probably variables with 0 coefficients are omitted at some point of computation
and because of that the restrictions do not affect their values.
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