diff src/samer/mds/Minkowski.java @ 0:bf79fb79ee13

Initial Mercurial check in.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/samer/mds/Minkowski.java	Tue Jan 17 17:50:20 2012 +0000
@@ -0,0 +1,16 @@
+package samer.mds;
+import samer.core.types.*;
+import samer.maths.*;
+
+/** Minkowski metric */
+
+public class Minkowski implements MDS.Metric {
+	VDouble exponent=new VDouble("exponent",1);
+	public Minkowski(double p) { exponent.set(p); }
+	public double d(double [] x, double [] y, double [] r) {
+		Mathx.sub(r,y,x);
+		double q=0, p=exponent.value;
+		for (int i=0; i<r.length; i++) q+=Math.pow(r[i],p);
+		return Math.pow(q,1/p);
+	}
+}