de.lmu.ifi.dbs.elki.distance.distancefunction
Class ArcCosineDistanceFunction

java.lang.Object
  de.lmu.ifi.dbs.elki.distance.distancefunction.AbstractPrimitiveDistanceFunction<NumberVector<?,?>,DoubleDistance>
      de.lmu.ifi.dbs.elki.distance.distancefunction.AbstractVectorDoubleDistanceFunction
          de.lmu.ifi.dbs.elki.distance.distancefunction.AbstractCosineDistanceFunction
              de.lmu.ifi.dbs.elki.distance.distancefunction.ArcCosineDistanceFunction

All Implemented Interfaces:

DistanceFunction<NumberVector<?,?>,DoubleDistance>, PrimitiveDistanceFunction<NumberVector<?,?>,DoubleDistance>, PrimitiveDoubleDistanceFunction<NumberVector<?,?>>, InspectionUtilFrequentlyScanned, Parameterizable

public class ArcCosineDistanceFunction
extends AbstractCosineDistanceFunction

Cosine distance function for feature vectors. The cosine distance is computed as the arcus from the cosine similarity value, i.e., arccos(<v1,v2>).

Nested Class Summary

static class

ArcCosineDistanceFunction.Parameterizer Parameterization class.

Field Summary

static ArcCosineDistanceFunction

STATIC Static instance

Constructor Summary

ArcCosineDistanceFunction()
Deprecated. Use static instance!

Method Summary

double	doubleDistance(NumberVector<?,?> v1, NumberVector<?,?> v2) Computes the cosine distance for two given feature vectors.
boolean	equals(Object obj)
String	toString()

Methods inherited from class de.lmu.ifi.dbs.elki.distance.distancefunction.AbstractCosineDistanceFunction

angle, angleSparse, instantiate

Methods inherited from class de.lmu.ifi.dbs.elki.distance.distancefunction.AbstractVectorDoubleDistanceFunction

distance, getDistanceFactory, getInputTypeRestriction

Methods inherited from class de.lmu.ifi.dbs.elki.distance.distancefunction.AbstractPrimitiveDistanceFunction

isMetric, isSymmetric

Methods inherited from class java.lang.Object

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

Methods inherited from interface de.lmu.ifi.dbs.elki.distance.distancefunction.DistanceFunction

isMetric, isSymmetric

Field Detail

STATIC

public static final ArcCosineDistanceFunction STATIC

Static instance

Constructor Detail

ArcCosineDistanceFunction

@Deprecated
public ArcCosineDistanceFunction()

Deprecated. Use static instance!

Provides a CosineDistanceFunction.

Method Detail

doubleDistance

public double doubleDistance(NumberVector<?,?> v1,
                             NumberVector<?,?> v2)

Computes the cosine distance for two given feature vectors. The cosine distance is computed as the arcus from the cosine similarity value, i.e., arccos(<v1,v2>).

Parameters:

v1 - first feature vector

v2 - second feature vector

Returns:

the cosine distance for two given feature vectors v1 and v2

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object