de.lmu.ifi.dbs.elki.utilities.referencepoints
Class AxisBasedReferencePoints<V extends NumberVector<V,?>>

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

Type Parameters:

V - Vector type

All Implemented Interfaces:

InspectionUtilFrequentlyScanned, Parameterizable, ReferencePointsHeuristic<V>

public class AxisBasedReferencePoints<V extends NumberVector<V,?>>
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

static class

AxisBasedReferencePoints.Parameterizer<V extends NumberVector<V,?>> Parameterization class.

Field Summary

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

AxisBasedReferencePoints(double spacescale)
Constructor.

Method Summary

<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 -

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<V,?>>

Parameters:

db - Database

Returns:

Collection of reference points.