/* * Rosenbrock.java * * Created on January 12, 2003, 2:18 PM * * * Copyright (C) 2003 - Edwin S. Peer * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ package net.sourceforge.cilib.Functions; import net.sourceforge.cilib.Problem.*; /** * * @author espeer */ public class Rosenbrock extends Function { public static final int DEFAULT_DIMENSION = 30; public static final Domain DEFAULT_DOMAIN = new Domain(-2.048, 2.048); public Rosenbrock() { super(DEFAULT_DIMENSION, DEFAULT_DOMAIN, 0); } public double evaluate(double[] x) { double tmp = 0; for (int i = 1; i double a = x[(i double b = x[(i tmp += 100 * (a - b * b) * (a - b * b) + (1 - b) * (1 - b); } return tmp; } }
