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

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.LPNormDistanceFunction

All Implemented Interfaces:

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

Direct Known Subclasses:

EuclideanDistanceFunction, ManhattanDistanceFunction, MaximumDistanceFunction, WeightedLPNormDistanceFunction

public class LPNormDistanceFunction
extends AbstractVectorDoubleDistanceFunction

Provides a LP-Norm for FeatureVectors.

Nested Class Summary

static class

LPNormDistanceFunction.Parameterizer Parameterization class.

Field Summary

private double	p Keeps the currently set p.
static OptionID	P_ID OptionID for the "p" parameter

Constructor Summary

LPNormDistanceFunction(double p)
Constructor, internal version.

Method Summary

double	doubleDistance(NumberVector<?,?> v1, NumberVector<?,?> v2) Returns the distance between the specified FeatureVectors as a LP-Norm for the currently set p.
boolean	equals(Object obj)
double	getP() Get the functions p parameter.
boolean	isMetric() Is this distance function metric (in particular, does it satisfy the triangle equation?)
String	toString()

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

instantiate, 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

instantiate, isSymmetric

Field Detail

P_ID

public static final OptionID P_ID

OptionID for the "p" parameter

p

private double p

Keeps the currently set p.

Constructor Detail

LPNormDistanceFunction

public LPNormDistanceFunction(double p)

Constructor, internal version.

Parameters:

p - Parameter p

Method Detail

doubleDistance

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

Returns the distance between the specified FeatureVectors as a LP-Norm for the currently set p.

Parameters:

v1 - first FeatureVector

v2 - second FeatureVector

Returns:

the distance between the specified FeatureVectors as a LP-Norm for the currently set p

getP

public double getP()

Get the functions p parameter.

Returns:

p

isMetric

public boolean isMetric()

Description copied from interface: DistanceFunction

Is this distance function metric (in particular, does it satisfy the triangle equation?)

Specified by:

isMetric in interface DistanceFunction<NumberVector<?,?>,DoubleDistance>

Overrides:

isMetric in class AbstractPrimitiveDistanceFunction<NumberVector<?,?>,DoubleDistance>

Returns:

true when metric.

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object