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/**
* Description: For comparison of goodness in landscape with stoch. ranking.
*
* Author Create/Modi Note
* Xiaofeng Xie May 29, 2004
*
* [1] Runarsson T P, Yao X. Stochastic ranking for constrained evolutionary
* optimization. IEEE Trans. on Evolutionary Computation. 2000, 4 (3): 284-294
*
*/
package net.adaptivebox.goodness;
import net.adaptivebox.global.*;
public class SRComparator implements IGoodnessCompareEngine, IUpdateCycleEngine {
public double Pf = 0.5;
public SRComparator() {}
public SRComparator(double pf) {
this.Pf = pf;
}
public void updateCycle(int t) {
Pf *=0.995;
}
/**
* check the magnitude of two array, the frontial is more important
* Stoch ranking: array size = 2
**/
public int compare(double[] fit1, double[] fit2) {
if((fit1[0]==fit2[0])||Pf>Math.random()) {
return GlobalCompare.compare(fit1[1], fit2[1]);
} else {
return GlobalCompare.compare(fit1[0], fit2[0]);
}
}
}
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