de.lmu.ifi.dbs.elki.data.model

Class ModelUtil

java.lang.Object

de.lmu.ifi.dbs.elki.data.model.ModelUtil

public final class ModelUtil
extends java.lang.Object

Utility classes for dealing with cluster models.

Since:

0.7.0

Author:

Erich Schubert

Constructor Summary

Constructors

Modifier	Constructor and Description
private	ModelUtil() Private constructor.

Method Summary

Modifier and Type	Method and Description
static NumberVector	getPrototype(Model model, Relation<? extends NumberVector> relation) Get the representative vector for a cluster model.
static <V extends NumberVector> V	getPrototype(Model model, Relation<? extends V> relation, NumberVector.Factory<V> factory) Get (and convert!)
static NumberVector	getPrototypeOrCentroid(Model model, Relation<? extends NumberVector> relation, DBIDs ids) Get the representative vector for a cluster model, or compute the centroid.
static <V extends NumberVector> V	getPrototypeOrCentroid(Model model, Relation<? extends V> relation, DBIDs ids, NumberVector.Factory<V> factory) Get the representative vector for a cluster model, or compute the centroid.

Methods inherited from class java.lang.Object

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

Constructor Detail

ModelUtil

private ModelUtil()

Private constructor. Static methods only.

Method Detail

getPrototype

public static <V extends NumberVector> V getPrototype(Model model,
                                                      Relation<? extends V> relation,
                                                      NumberVector.Factory<V> factory)

Get (and convert!) the representative vector for a cluster model. Only representative-based models are supported! null is returned when the model is not supported!

Type Parameters:

V - desired vector type

Parameters:

model - Model

relation - Data relation (for representatives specified per DBID)

factory - Vector factory, for type conversion.

Returns:

Vector of type V, null if not supported.

getPrototype

public static NumberVector getPrototype(Model model,
                                        Relation<? extends NumberVector> relation)

Get the representative vector for a cluster model. Only representative-based models are supported! null is returned when the model is not supported!

Parameters:

model - Model

relation - Data relation (for representatives specified per DBID)

Returns:

Some NumberVector, null if not supported.

getPrototypeOrCentroid

public static <V extends NumberVector> V getPrototypeOrCentroid(Model model,
                                                                Relation<? extends V> relation,
                                                                DBIDs ids,
                                                                NumberVector.Factory<V> factory)

Get the representative vector for a cluster model, or compute the centroid.

Type Parameters:

V - desired vector type

Parameters:

model - Model

relation - Data relation (for representatives specified per DBID)

ids - Cluster ids (must not be empty.

Returns:

Vector of type V, null if not supported.

getPrototypeOrCentroid

public static NumberVector getPrototypeOrCentroid(Model model,
                                                  Relation<? extends NumberVector> relation,
                                                  DBIDs ids)

Get the representative vector for a cluster model, or compute the centroid.

Parameters:

model - Model

relation - Data relation (for representatives specified per DBID)

ids - Cluster ids (must not be empty.

Returns:

Some NumberVector.