samer@0: package samer.mds;
samer@0: import samer.core.types.*;
samer@0: import samer.maths.*;
samer@0: 
samer@0: /** Minkowski metric */
samer@0: 
samer@0: public class Minkowski implements MDS.Metric {
samer@0: 	VDouble exponent=new VDouble("exponent",1);
samer@0: 	public Minkowski(double p) { exponent.set(p); }
samer@0: 	public double d(double [] x, double [] y, double [] r) {
samer@0: 		Mathx.sub(r,y,x);
samer@0: 		double q=0, p=exponent.value;
samer@0: 		for (int i=0; i<r.length; i++) q+=Math.pow(r[i],p);
samer@0: 		return Math.pow(q,1/p);
samer@0: 	}
samer@0: }