schwefel.java

人工智能带有xml文件的微粒群算法的java库程序包 可以直接运行时导入

/*
 * Schwefel.java
 *
 * Created on January 12, 2003, 3:58 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.*;
import java.util.*;

/**
 *
 * @author  espeer
 */
public class Schwefel extends Function {
    
    public static final int DEFAULT_DIMENSION = 30;
    public static final Domain DEFAULT_DOMAIN = new Domain(-500, 500);
    
    public Schwefel() {
        super(DEFAULT_DIMENSION, DEFAULT_DOMAIN, 0);
    }
    
    public double evaluate(double[] x) {
        double sum = 0;
        boolean outside = false;
        for (int i = 0; i < dimension; ++i) {
            if (x[i] < domain.getLowerBound() || x[i] > domain.getUpperBound()) {
                outside = true;
            }
            sum += x[i] * Math.sin(Math.sqrt(Math.abs(x[i])));
        }
        sum += dimension * 4.18982887272434686131e+02;
        if (outside) {
            sum = 1e50;
        }
        return sum;
    }
    
}