Package elki.index.tree.spatial.kd

Class PartialSquaredEuclideanDistance

java.lang.Object

elki.index.tree.spatial.kd.PartialSquaredEuclideanDistance

All Implemented Interfaces:

PartialDistance<NumberVector>

public class PartialSquaredEuclideanDistance
extends java.lang.Object
implements PartialDistance<NumberVector>

Partial distance computations for squared Euclidean distance.

Since:

0.8.0

Author:

Erich Schubert

Field Summary

Fields

Modifier and Type	Field	Description
static PartialSquaredEuclideanDistance	STATIC	Static instance

Constructor Summary

Constructors

Modifier	Constructor	Description
private	PartialSquaredEuclideanDistance()	Deprecated.

Method Summary

Modifier and Type	Method	Description
double	combineRaw(double rawdist, double delta, double prevdelta)	Combine the distance information.
boolean	compareRawRegular(double raw, double reg)	Check if a "raw" distance is less or equal a regular distance.
double	distance(NumberVector a, NumberVector b)	Compute the actual distance of two objects.
double	transformOut(double rawdist)	Transform a raw distance to an output (external) distance.

Methods inherited from class java.lang.Object

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

Field Detail

STATIC

public static final PartialSquaredEuclideanDistance STATIC

Static instance

Constructor Detail

PartialSquaredEuclideanDistance

@Deprecated
private PartialSquaredEuclideanDistance()

Deprecated.

Constructor. Use STATIC instead.

Method Detail

combineRaw

public double combineRaw(double rawdist,
                         double delta,
                         double prevdelta)

Description copied from interface: PartialDistance

Combine the distance information.

Specified by:

combineRaw in interface PartialDistance<NumberVector>

Parameters:

rawdist - Raw (often squared) previous distance

delta - New delta

prevdelta - Previous delta

Returns:

New raw distance

compareRawRegular

public boolean compareRawRegular(double raw,
                                 double reg)

Description copied from interface: PartialDistance

Check if a "raw" distance is less or equal a regular distance.

Specified by:

compareRawRegular in interface PartialDistance<NumberVector>

Parameters:

raw - Raw distance (usually squared)

reg - Regular distance

Returns:

True if less than or equal

distance

public double distance(NumberVector a,
                       NumberVector b)

Description copied from interface: PartialDistance

Compute the actual distance of two objects.

Specified by:

distance in interface PartialDistance<NumberVector>

Parameters:

a - First

b - Second

Returns:

Distance

transformOut

public double transformOut(double rawdist)

Description copied from interface: PartialDistance

Transform a raw distance to an output (external) distance.

Specified by:

transformOut in interface PartialDistance<NumberVector>

Parameters:

rawdist - Raw distance

Returns:

External distance