eva2/src/javaeva/server/go/problems/F1Problem.java

package javaeva.server.go.problems;

import javaeva.server.go.individuals.AbstractEAIndividual;
import javaeva.server.go.individuals.InterfaceDataTypeDouble;
import javaeva.server.go.populations.Population;
import javaeva.server.go.strategies.InterfaceOptimizer;

/**
 * Created by IntelliJ IDEA.
 * User: streiche
 * Date: 24.03.2003
 * Time: 17:58:55
 * To change this template use Options | File Templates.
 */
public class F1Problem extends AbstractProblemDouble implements Interface2DBorderProblem, java.io.Serializable {

    /**
	 * 
	 */
	private static final long serialVersionUID = 4870484001737601464L;
	protected AbstractEAIndividual      m_OverallBest       = null;
    protected int                       m_ProblemDimension  = 10;
    protected double                    m_XOffSet           = 0.0;
    protected double                    m_YOffSet           = 0.0;
    protected boolean                   m_UseTestConstraint = false;

    public F1Problem() {
    	super();
    }
    
    public F1Problem(F1Problem b) {
        //AbstractOptimizationProblem
        if (b.m_Template != null)
            this.m_Template         = (AbstractEAIndividual)((AbstractEAIndividual)b.m_Template).clone();
        //F1Problem
        if (b.m_OverallBest != null)
            this.m_OverallBest      = (AbstractEAIndividual)((AbstractEAIndividual)b.m_OverallBest).clone();
        this.m_ProblemDimension = b.m_ProblemDimension;
        this.m_Noise            	= b.m_Noise;
        this.m_DefaultRange		= b.m_DefaultRange;
        this.m_XOffSet          = b.m_XOffSet;
        this.m_YOffSet          = b.m_YOffSet;
        this.m_UseTestConstraint = b.m_UseTestConstraint;
    }

    /** This method returns a deep clone of the problem.
     * @return  the clone
     */
    public Object clone() {
        return (Object) new F1Problem(this);
    }

    /** This method inits the Problem to log multiruns
     */
    public void initProblem() {
        this.m_OverallBest = null;
    }

    /** This method inits a given population
     * @param population    The populations that is to be inited
     */
    public void initPopulation(Population population) {
        super.initPopulation(population);

    }

	protected double[] getEvalArray(AbstractEAIndividual individual){
		double[] x = super.getEvalArray(individual);
        // add an offset in solution space
        for (int i = 0; i < x.length; i++) x[i] = x[i] - this.m_XOffSet;
        return x;
	}
     
	protected void setEvalFitness(AbstractEAIndividual individual, double[] x, double[] fit) {
		super.setEvalFitness(individual, x, fit);
        if (this.m_UseTestConstraint) {
            if (x[0] < 1) individual.addConstraintViolation(1-x[0]);
        }
        if ((this.m_OverallBest == null) || (this.m_OverallBest.getFitness(0) > individual.getFitness(0))) {
            this.m_OverallBest = (AbstractEAIndividual)individual.clone();
        }	
	}

    /** Ths method allows you to evaluate a simple bit string to determine the fitness
     * @param x     The n-dimensional input vector
     * @return  The m-dimensional output vector.
     */
    public double[] eval(double[] x) {
        double[] result = new double[1];
        result[0]     = 0;
        for (int i = 0; i < x.length; i++) {
            result[0]  += Math.pow(x[i], 2);
        }
        return result;
    }

    /** This method returns a string describing the optimization problem.
     * @param opt       The Optimizer that is used or had been used.
     * @return The description.
     */
    public String getStringRepresentationForProblem(InterfaceOptimizer opt) {
        StringBuffer sb = new StringBuffer(200);
        sb.append("F1 Sphere model:\n");
        sb.append("Here the individual codes a vector of real number x and F1(x)= x^2 is to be minimized.\nParameters:\n");
        sb.append("Dimension   : "); 
        sb.append(this.m_ProblemDimension);
        sb.append("\nNoise level : ");
        sb.append(this.m_Noise);
//        sb.append("\nSolution representation:\n");
//		  sb.append(this.m_Template.getSolutionRepresentationFor());
        return sb.toString();
    }

/**********************************************************************************************************************
 * These are for GUI
 */
    /** This method allows the CommonJavaObjectEditorPanel to read the
     * name to the current object.
     * @return The name.
     */
    public String getName() {
        return "F1-Problem";
    }

    /** This method returns a global info string
     * @return description
     */
    public String globalInfo() {
        return "F1: multidimensional parabola problem";
    }

    /** This method allows you to set/get an offset for decision variables.
     * @param XOffSet     The offset for the decision variables.
     */
    public void setXOffSet(double XOffSet) {
        this.m_XOffSet = XOffSet;
    }
    public double getXOffSet() {
        return this.m_XOffSet;
    }
    public String xOffSetTipText() {
        return "Choose an offset for the decision variable.";
    }

    /** This method allows you to set/get the offset for the
     * objective value.
     * @param YOffSet     The offset for the objective value.
     */
    public void setYOffSet(double YOffSet) {
        this.m_YOffSet = YOffSet;
    }
    public double getYOffSet() {
        return this.m_YOffSet;
    }
    public String yOffSetTipText() {
        return "Choose an offset for the objective value.";
    }
    /** Length of the x vector at is to be optimized
     * @param t Length of the x vector at is to be optimized
     */
    public void setProblemDimension(int t) {
        this.m_ProblemDimension = t;
    }
    public int getProblemDimension() {
        return this.m_ProblemDimension;
    }
    public String problemDimensionTipText() {
        return "Length of the x vector at is to be optimized.";
    }
    /** This method allows you to toggle the application of a simple test constraint.
     * @param b     The mode for the test constraint
     */
    public void setUseTestConstraint(boolean b) {
        this.m_UseTestConstraint = b;
    }
    public boolean getUseTestConstraint() {
        return this.m_UseTestConstraint;
    }
    public String useTestConstraintTipText() {
        return "Just a simple test constraint of x[0] >= 1.";
    }
    
	public double functionValue(double[] point) {
		double x[] = new double[m_ProblemDimension];
		for (int i=0; i<point.length; i++) x[i]=point[i];
		for (int i=point.length; i<m_ProblemDimension; i++) x[i] = 0;
		return Math.sqrt(eval(x)[0]);
	}
	
	public double[][] get2DBorder() {
    	return ((InterfaceDataTypeDouble)this.m_Template).getDoubleRange();                             
	}
}