com.rapidminer.tools.math.similarity.nominal
Class NominalDistance

java.lang.Object
  com.rapidminer.tools.math.similarity.DistanceMeasure
      com.rapidminer.tools.math.similarity.nominal.NominalDistance

All Implemented Interfaces:

java.io.Serializable

public class NominalDistance
extends DistanceMeasure

A distance measure for nominal values accounting a value of one if two values are unequal.

Author:

Sebastian Land, Michael Wurst

See Also:

Serialized Form

Constructor Summary

NominalDistance()

Method Summary

double	calculateDistance(double[] value1, double[] value2) This method does the calculation of the distance between two double arrays.
double	calculateSimilarity(double[] value1, double[] value2) This method does the similarity of the distance between two double arrays.
void	init(ExampleSet exampleSet) Before using a similarity measure, it is needed to initialise.

Methods inherited from class com.rapidminer.tools.math.similarity.DistanceMeasure

calculateDistance, calculateDistance, calculateSimilarity, calculateSimilarity, init, init, isDistance, isSimilarity

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NominalDistance

public NominalDistance()

Method Detail

calculateDistance

public double calculateDistance(double[] value1,
                                double[] value2)

Description copied from class: DistanceMeasure

This method does the calculation of the distance between two double arrays. The meanings of the double values might be remembered from the init method.

Specified by:

calculateDistance in class DistanceMeasure

Returns:

the distance

calculateSimilarity

public double calculateSimilarity(double[] value1,
                                  double[] value2)

Description copied from class: DistanceMeasure

This method does the similarity of the distance between two double arrays. The meanings of the double values might be remembered from the init method.

Specified by:

calculateSimilarity in class DistanceMeasure

Returns:

the distance

init

public void init(ExampleSet exampleSet)

Description copied from class: DistanceMeasure

Before using a similarity measure, it is needed to initialise. Subclasses might use initialising for remembering the exampleset properties like attribute type or test if applicable to exampleSet at all. Please note that it might be necessary to also override the other init methods if this measrue should make use of parameters or other IOObjects.

Specified by:

init in class DistanceMeasure

Parameters:

exampleSet - the exampleset