es.udc.gii.common.eaf.benchmark.real_param.ShekelFamilyObjectiveFunction.java Source code

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Here is the source code for es.udc.gii.common.eaf.benchmark.real_param.ShekelFamilyObjectiveFunction.java

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/*
* Copyright (C) 2010 Grupo Integrado de Ingeniera
* 
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/

/*
 * SchwefelsProblemObjectiveFunction.java
 *
 * Created on 4 de julio de 2007, 19:35
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package es.udc.gii.common.eaf.benchmark.real_param;

import es.udc.gii.common.eaf.benchmark.BenchmarkObjectiveFunction;
import java.util.Arrays;
import org.apache.commons.configuration.Configuration;

/**
 * El optimo de esta funcion objetivo es f(0.201,0.150,0.477,0.275,0.311,0.657)
 * = -3.32.
 *
 * @author Grupo Integrado de Ingeniera (<a href="http://www.gii.udc.es">www.gii.udc.es</a>) 
 * @since 1.0
 */
public class ShekelFamilyObjectiveFunction extends BenchmarkObjectiveFunction {

    private int m;

    private double[][] a = { { 4.0, 4.0, 4.0, 4.0 }, { 1.0, 1.0, 1.0, 1.0 }, { 8.0, 8.0, 8.0, 8.0 },
            { 6.0, 6.0, 6.0, 6.0 }, { 3.0, 7.0, 3.0, 7.0 }, { 2.0, 9.0, 2.0, 9.0 }, { 5.0, 5.0, 3.0, 3.0 },
            { 8.0, 1.0, 8.0, 1.0 }, { 6.0, 2.0, 6.0, 2.0 }, { 7.0, 3.6, 7.0, 3.6 } };
    private double[] c = { 0.1, 0.2, 0.2, 0.4, 0.4, 0.6, 0.3, 0.7, 0.5, 0.5 };

    /** Creates a new instance of SchwefelsProblemObjectiveFunction */
    public ShekelFamilyObjectiveFunction() {
        this.m = 10;
    }

    public ShekelFamilyObjectiveFunction(int m) {
        this.m = m;
    }

    @Override
    public void configure(Configuration conf) {
        super.configure(conf);
        this.m = conf.getInt("M");
    }

    @Override
    public double evaluate(double[] values) {

        double fitness;

        fitness = this.shekel(values);

        return fitness - this.getOptimumValue();

    }

    private double shekel(double[] values) {

        double fitness = 0.0;
        double sum, x;

        for (int i = 0; i < this.m; i++) {

            sum = 0.0;
            for (int j = 0; j < values.length; j++) {

                //x ~ [0,10.0]
                x = values[j] * 5.0 + 5.0;

                sum += (x - a[i][j]) * (x - a[i][j]);

            }

            fitness += 1.0 / (sum + c[i]);

        }

        fitness = -fitness;

        return fitness;
    }

    @Override
    public void reset() {
    }

    private double getOptimumValue() {

        double opt = Double.NaN;

        double[] optimum = new double[4];

        for (int i = 0; i < 4; i++) {
            optimum[i] = 4.0 / 5.0 - 1.0;
        }

        opt = this.shekel(optimum);

        return opt;
    }

    @Override
    public double[][] getOptimum(int dim) {

        double[][] optimums = new double[1][];
        double[] optimum = new double[4];

        Arrays.fill(optimum, 4.0 / 5.0 - 1.0);

        optimums[0] = optimum;
        return optimums;

    }

    public void setM(int m) {
        this.m = m;
    }

    @Override
    public int getDimension() {
        return 4;
    }

}