com.github.TKnudsen.ComplexDataObject.model.distanceMeasure.Double.WeightedMinkowskiDistance Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of complex-data-object Show documentation

A library that models real-world objects in Java, referred to as ComplexDataObjects. Other features: IO and preprocessing of ComplexDataObjects.

The newest version!

package com.github.TKnudsen.ComplexDataObject.model.distanceMeasure.Double;

import java.util.List;

import com.github.TKnudsen.ComplexDataObject.model.distanceMeasure.WeightedDistanceMeasure;

/**
 * 
 * Title: WeightedMinkowskiDistance
 * 
 * 
 * 
 * Description:
 * 
 * 
 * 
 * Copyright: (c) 2016-2017 Juergen Bernard
 * 
 * 
 * @author Christian Ritter
 * @version 1.01
 */
public class WeightedMinkowskiDistance extends WeightedDistanceMeasure {

	private double exponent;

	public WeightedMinkowskiDistance(List weights) {
		this(weights, 2.0);
	}

	public WeightedMinkowskiDistance(List weights, double nullValue) {
		super(weights, nullValue);
	}

	public WeightedMinkowskiDistance(List weights, double nullValue, double exponent) {
		super(weights, nullValue);
		this.exponent = exponent;
	}

	@Override
	public String getDescription() {
		return "WeightedMinkowskiDistanceMeasure";
	}

	@Override
	public double getDistance(double[] o1, double[] o2) {
		if (o1.length != o2.length || o1.length != getWeights().size())
			throw new IllegalArgumentException(getName() + ": given arrays have different length");

		int length = o1.length;
		double result = 0;

		for (int i = 0; i < length; i++) {
			if (!Double.isNaN(o1[i] + o2[i]))
				result += getWeights().get(i) * Math.pow(Math.abs((o1[i] - o2[i])), exponent);
			else
				result += getNullValue() * getWeights().get(i);
		}

		return Math.pow(result, 1 / exponent);
	}

	@Override
	public String getName() {
		return "WeightedMinkowskiDistanceMeasure";
	}

}