/* * 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 <= dimension / 2; ++i) {            double a = x[(i<<1)-1];            double b = x[(i<<1)-2];            tmp += 100 * (a - b * b) * (a - b * b) + (1 - b) * (1 - b);        }        return tmp;    }    }