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

java.lang.Object
  de.lmu.ifi.dbs.elki.logging.AbstractLoggable
      de.lmu.ifi.dbs.elki.utilities.referencepoints.AxisBasedReferencePoints<O>

Type Parameters:

O - Object type

All Implemented Interfaces:

Parameterizable, ReferencePointsHeuristic<O>

public class AxisBasedReferencePoints<O extends NumberVector<O,?>>
extends AbstractLoggable
implements ReferencePointsHeuristic<O>

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.

Author:

Erich Schubert

Field Summary

static OptionID	SPACE_SCALE_ID OptionID for SPACE_SCALE_PARAM
private DoubleParameter	SPACE_SCALE_PARAM 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_PARAM.

Fields inherited from class de.lmu.ifi.dbs.elki.logging.AbstractLoggable

debug, logger

Constructor Summary

AxisBasedReferencePoints(Parameterization config)
Constructor, adhering to Parameterizable

Method Summary

Collection<O>

getReferencePoints(Database<O> db) Get the reference points for the given database.

Methods inherited from class de.lmu.ifi.dbs.elki.logging.AbstractLoggable

debugFine, debugFiner, debugFinest, exception, progress, verbose, warning

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

OptionID for SPACE_SCALE_PARAM

SPACE_SCALE_PARAM

private final DoubleParameter SPACE_SCALE_PARAM

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_PARAM.

Constructor Detail

AxisBasedReferencePoints

public AxisBasedReferencePoints(Parameterization config)

Constructor, adhering to Parameterizable

Parameters:

config - Parameterization

Method Detail

getReferencePoints

public Collection<O> getReferencePoints(Database<O> db)

Description copied from interface: ReferencePointsHeuristic

Get the reference points for the given database.

Specified by:

getReferencePoints in interface ReferencePointsHeuristic<O extends NumberVector<O,?>>

Parameters:

db - Database

Returns:

Collection of reference points.