padecurvefitting.java

基于差分进化与粒子群混合算法优化源程序,这是一个java语言编制的源程序,很实用.

/**
 * Description: Pade fitting function
 *
 * @ Author        Create/Modi     Note
 * Xiaofeng Xie    Jun 26, 2008
 *
 * @version 1.0
 * @Since MAOS1.0
 *
 */

package problem.custom;

public class PadeCurveFitting extends AbstractCurveFitting {
  private static int NG = 2;
  private double minY = -100;
  private double maxY = 100;

  private double[] xx = new double[NG];

  public PadeCurveFitting() throws Exception {
    super(NG);
  }

  public void initEncoder() throws Exception {
    if (NG!=2) {
      initParams(NG*2+1);
      xx = new double[NG];
    }
    
    super.initEncoder();
    setDefaultXRanges();
  }

  private void setDefaultXRanges() {
    for(int i=0; i<NG*2+1; i++) {
      setDefaultXAt(i, minY, maxY);
    }
  }

  public boolean setParameter(String name, String value) {
    if (super.setParameter(name, value)) return true;
    else if (name.equalsIgnoreCase("NG"))  NG=new Integer(value).intValue();
    else if (name.equalsIgnoreCase("minY"))  minY=new Integer(value).intValue();
    else if (name.equalsIgnoreCase("maxY"))  maxY=new Integer(value).intValue();
    else return false;
    return true;
  }

  protected double getFuncValue(double x, double[] VX) {
    xx[0] = x;
    for (int i=1; i<xx.length; i++) {
      xx[i] = xx[0]*xx[i-1];
    }
    double realV1 = VX[0];
    for (int i=0; i<xx.length; i++) {
      realV1+= VX[i+1]*xx[i];
    }
    double realV2 = 1;
    for (int i=0; i<xx.length; i++) {
      realV2+= VX[xx.length+i+1]*xx[i];
    }
    return realV1/realV2;
  }
}