Java tutorial
/* Copyright 2009-2016 David Hadka * * This file is part of the MOEA Framework. * * The MOEA Framework is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or (at your * option) any later version. * * The MOEA Framework is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public * License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with the MOEA Framework. If not, see <http://www.gnu.org/licenses/>. */ package org.moeaframework.examples.gp.regression; import org.apache.commons.math3.analysis.UnivariateFunction; /** * The Quartic function as introduced by Koza [1]. The function is * {@code f(x) = x^4 + x^3 + x^2 + x}. * * References: * <ol> * <li>Koza, J.R. "Genetic Programming: On the Programming of Computers by * Means of Natural Selection." MIT Press, Cambridge, MA, USA, 1992. * </ol> */ public class QuarticExample implements UnivariateFunction { /** * Runs the Quartic demo problem. * * @param args the command line arguments */ public static void main(String[] args) { SymbolicRegressionGUI.runDemo(new SymbolicRegression(new QuarticExample(), -1.0, 1.0, 100)); } @Override public double value(double x) { return x * x * x * x + x * x * x + x * x + x; } }