Java tutorial
/** * Copyright (C) 2015 Tobias Uhlig (tobias.uhlig@unibw.de) * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package de.termininistic.serein.examples.benchmarks.functions.multimodal; import org.apache.commons.math3.linear.ArrayRealVector; import org.apache.commons.math3.linear.RealVector; import de.termininistic.serein.examples.benchmarks.functions.BenchmarkFunction; import de.termininistic.serein.examples.benchmarks.functions.Domain; public class MichalewiczFunction implements BenchmarkFunction { public final static Domain DEFAULT_DOMAIN = new Domain(0.0, Math.PI); public final static int DEFAULT_M_PARAMETER = 10; private final Domain domain; private final int m; public MichalewiczFunction() { this(DEFAULT_DOMAIN, DEFAULT_M_PARAMETER); } public MichalewiczFunction(Domain domain, int m) { this.domain = domain; this.m = m; } @Override public double map(RealVector v) { double[] x = v.toArray(); double sum = 0.0; for (int i = 0; i < x.length; i++) { sum += Math.sin(x[i]) * Math.pow(Math.sin((i + 1) * x[i] * x[i] / Math.PI), 2 * m); } return -sum; } @Override public Domain getDomain() { return domain; } @Override public RealVector getOptimum(int dimension) { return new ArrayRealVector(dimension, 0.0); } }