[MATH-631] "RegulaFalsiSolver" failure

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0
• Assignee: Unassigned
• Reporter: Gilles Sadowski
• Created: 23/Jul/11 23:48
• Updated: 24/Mar/12 16:16
• Resolved: 08/Sep/11 12:13

Description

The following unit test:

@Test
public void testBug() {
    final UnivariateRealFunction f = new UnivariateRealFunction() {
            @Override
            public double value(double x) {
                return Math.exp(x) - Math.pow(Math.PI, 3.0);
            }
        };

    UnivariateRealSolver solver = new RegulaFalsiSolver();
    double root = solver.solve(100, f, 1, 10);
}

fails with

illegal state: maximal count (100) exceeded: evaluations

Using "PegasusSolver", the answer is found after 17 evaluations.

Issue Links

• is related to: MATH-599 Re-implementation of Secant-based root finding algorithms