de.lmu.ifi.dbs.elki.utilities.referencepoints

Class AxisBasedReferencePoints<V extends NumberVector<?>>

java.lang.Object

de.lmu.ifi.dbs.elki.utilities.referencepoints.AxisBasedReferencePoints<V>

Type Parameters:

V - Vector type

All Implemented Interfaces:

Parameterizable, ReferencePointsHeuristic<V>

public class AxisBasedReferencePoints<V extends NumberVector<?>>
extends Object
implements ReferencePointsHeuristic<V>

Strategy to pick reference points by placing them on the axis ends. This strategy produces n+2 reference points that lie on the edges of the surrounding cube.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	AxisBasedReferencePoints.Parameterizer<V extends NumberVector<?>> Parameterization class.

Field Summary

Fields

Modifier and Type	Field and Description
static OptionID	SPACE_SCALE_ID Parameter to specify the extra scaling of the space, to allow out-of-data-space reference points.
protected double	spacescale Holds the value of SPACE_SCALE_ID.

Constructor Summary

Constructors

Constructor and Description
AxisBasedReferencePoints(double spacescale) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
<T extends V> Collection<V>	getReferencePoints(Relation<T> db) Get the reference points for the given database.

Methods inherited from class java.lang.Object

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

Field Detail

SPACE_SCALE_ID

public static final OptionID SPACE_SCALE_ID

Parameter to specify the extra scaling of the space, to allow out-of-data-space reference points.

Key: -axisref.scale

spacescale

protected double spacescale

Holds the value of SPACE_SCALE_ID.

Constructor Detail

AxisBasedReferencePoints

public AxisBasedReferencePoints(double spacescale)

Constructor.

Parameters:

spacescale - Extra scaling

Method Detail

getReferencePoints

public <T extends V> Collection<V> getReferencePoints(Relation<T> db)

Description copied from interface: ReferencePointsHeuristic

Get the reference points for the given database.

Specified by:

getReferencePoints in interface ReferencePointsHeuristic<V extends NumberVector<?>>

Parameters:

db - Database

Returns:

Collection of reference points.