view src/samer/mds/DistanceTask.java @ 0:bf79fb79ee13

Initial Mercurial check in.

package samer.mds;

// import samer.core.*;
import samer.maths.*;
import samer.tools.*;

/**
	Transfer distances directly from a distance matrix to an MDS
	object's distance vector.
*/
public class DistanceTask extends AnonymousTask
{
	int		N;
	double [] d;				// linear array of distances
	double [][] _D;			// matrix of source data
		
	/** link each object to all the others using distances in matrix, returns a task
		that can be used to refresh distances from original matrix */
	public DistanceTask(MDSBase mds, Matrix D) {
		N = D.getRowDimension();
		
		d=new double[N*(N - 1)/2];
		_D=D.getArray();
		
		mds.clearLinks(d);
		for (int k=0, i=0; i<N; i++) 
			for (int j=i+1; j<N; j++) mds.setLink(k++,i,j);
		
		run();
	}

	public Vec getDistances() { return new Vec.ForArray(d); }
	public void run() {
		for (int k=0, i=0; i<N; i++) {
			double [] Drow=_D[i];
			for (int j=i+1; j<N; j++) d[k++]=Drow[j];
		}
	}
}