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https://issues.apache.org/jira/browse/MATH-1333?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Connor Petty updated MATH-1333:
-------------------------------
Priority: Major (was: Minor)
> MullerSolver returns value that is out of bounds
> ------------------------------------------------
>
> Key: MATH-1333
> URL: https://issues.apache.org/jira/browse/MATH-1333
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 3.6
> Reporter: Connor Petty
>
> package whatever;
> import org.apache.commons.math3.analysis.UnivariateFunction;
> import org.apache.commons.math3.analysis.solvers.MullerSolver;
> import org.apache.commons.math3.util.FastMath;
> /**
> *
> * @author Connor Petty <[email protected]>
> */
> public class BrokenMuller {
> public static void main(String[] args) {
> UnivariateFunction logFunction = new UnivariateFunction() {
> private double log1pe(double x) {
> if (x > 0) {
> return x + FastMath.log1p(FastMath.exp(-x));
> } else {
> return FastMath.log1p(FastMath.exp(x));
> }
> }
> @Override
> public double value(double x) {
> double a = 0.15076136473214652;
> double b = 4.880819340168248;
> double c = -2330.4196672490493;
> double d = 1.1871451743330544E-16;
> //aa*log(1+e^(bbx+c))+d - 0.01 * x - 20 * 0.01
> return a * a * log1pe(b * b * x + c) + d - 0.01 * x - 20 *
> 0.01;
> }
> };
> MullerSolver solver = new MullerSolver(0.25);
> double min = 20;
> double max = 100.04173804515072;
> double result = solver.solve(1000, logFunction, min, max, 100.0/3.0);
> if (result < min || result > max) {
> throw new RuntimeException("value [" + result + "] is out of
> bounds!");
> }
> }
> }
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