de.lmu.ifi.dbs.elki.distance.distancefunction.subspace

Class AbstractDimensionsSelectingDistanceFunction<V extends FeatureVector<?>>

java.lang.Object

de.lmu.ifi.dbs.elki.distance.distancefunction.AbstractPrimitiveDistanceFunction<V>

de.lmu.ifi.dbs.elki.distance.distancefunction.subspace.AbstractDimensionsSelectingDistanceFunction<V>

Type Parameters:

V - the type of FeatureVector to compute the distances in between

All Implemented Interfaces:

DistanceFunction<V>, PrimitiveDistanceFunction<V>, DimensionSelectingSubspaceDistanceFunction<V>

Direct Known Subclasses:

SubspaceLPNormDistanceFunction

public abstract class AbstractDimensionsSelectingDistanceFunction<V extends FeatureVector<?>>
extends AbstractPrimitiveDistanceFunction<V>
implements PrimitiveDistanceFunction<V>, DimensionSelectingSubspaceDistanceFunction<V>

Abstract base class for distances computed only in subspaces. Selected dimensions are encuded as bits in a long[].

Author:

Elke Achtert

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	AbstractDimensionsSelectingDistanceFunction.Parameterizer Parameterization class.

Field Summary

Fields

Modifier and Type	Field and Description
protected long[]	dimensions The dimensions to be considered for distance computation.

Constructor Summary

Constructors

Constructor and Description
AbstractDimensionsSelectingDistanceFunction(long[] dimensions) Constructor.

Method Summary

Modifier and Type	Method and Description
double	distance(V o1, V o2) Computes the distance between two given DatabaseObjects according to this distance function.
boolean	equals(Object obj)
long[]	getSelectedDimensions() Returns a bit set representing the selected dimensions.
void	setSelectedDimensions(long[] dimensions) Sets the selected dimensions according to the set bits in the given BitSet.

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

instantiate, isMetric, isSymmetric

Methods inherited from class java.lang.Object

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

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

getInputTypeRestriction

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

instantiate, isMetric, isSymmetric

Field Detail

dimensions

protected long[] dimensions

The dimensions to be considered for distance computation.

Constructor Detail

AbstractDimensionsSelectingDistanceFunction

public AbstractDimensionsSelectingDistanceFunction(long[] dimensions)

Constructor.

Parameters:

dimensions -

Method Detail

distance

public double distance(V o1,
                       V o2)

Description copied from interface: PrimitiveDistanceFunction

Computes the distance between two given DatabaseObjects according to this distance function.

Specified by:

distance in interface PrimitiveDistanceFunction<V extends FeatureVector<?>>

Specified by:

distance in class AbstractPrimitiveDistanceFunction<V extends FeatureVector<?>>

Parameters:

o1 - first DatabaseObject

o2 - second DatabaseObject

Returns:

the distance between two given DatabaseObjects according to this distance function

getSelectedDimensions

public long[] getSelectedDimensions()

Description copied from interface: DimensionSelectingSubspaceDistanceFunction

Returns a bit set representing the selected dimensions.

Specified by:

getSelectedDimensions in interface DimensionSelectingSubspaceDistanceFunction<V extends FeatureVector<?>>

Returns:

a bit set representing the selected dimensions

setSelectedDimensions

public void setSelectedDimensions(long[] dimensions)

Description copied from interface: DimensionSelectingSubspaceDistanceFunction

Sets the selected dimensions according to the set bits in the given BitSet.

Specified by:

setSelectedDimensions in interface DimensionSelectingSubspaceDistanceFunction<V extends FeatureVector<?>>

Parameters:

dimensions - a bit set designating the new selected dimensions

equals

public boolean equals(Object obj)

Overrides:

equals in class Object