de.lmu.ifi.dbs.elki.math.linearalgebra

Class ProjectedCentroid

java.lang.Object

de.lmu.ifi.dbs.elki.math.linearalgebra.Centroid

de.lmu.ifi.dbs.elki.math.linearalgebra.ProjectedCentroid

All Implemented Interfaces:

FeatureVector<java.lang.Number>, NumberVector, SpatialComparable

public class ProjectedCentroid
extends Centroid

Centroid only using a subset of dimensions. This class abstracts the mathematics of efficient and numerically stable computation of projected centroids. See DatabaseUtil for easier to use APIs.

Since:

0.4.0

Author:

Erich Schubert

Nested Class Summary

Nested classes/interfaces inherited from interface de.lmu.ifi.dbs.elki.data.NumberVector

NumberVector.Factory<V extends NumberVector>

Field Summary

Fields

Modifier and Type	Field and Description
private long[]	dims The selected dimensions.

Fields inherited from class de.lmu.ifi.dbs.elki.math.linearalgebra.Centroid

elements, wsum

Fields inherited from interface de.lmu.ifi.dbs.elki.data.NumberVector

ATTRIBUTE_SEPARATOR, FIELD, FIELD_1D, FIELD_2D, VARIABLE_LENGTH

Fields inherited from interface de.lmu.ifi.dbs.elki.data.FeatureVector

TYPE

Constructor Summary

Constructors

Constructor and Description
ProjectedCentroid(long[] dims, int dim) Constructor for updating use.

Method Summary

Modifier and Type	Method and Description
static ProjectedCentroid	make(long[] dims, Relation<? extends NumberVector> relation) Static Constructor from a relation.
static ProjectedCentroid	make(long[] dims, Relation<? extends NumberVector> relation, DBIDs ids) Static Constructor from a relation.
void	put(double[] val) Add a single value with weight 1.0.
void	put(double[] val, double weight) Add data with a given weight.
void	put(NumberVector val) Add a single value with weight 1.0.
void	put(NumberVector val, double weight) Add data with a given weight.

Methods inherited from class de.lmu.ifi.dbs.elki.math.linearalgebra.Centroid

doubleValue, getArrayRef, getDimensionality, longValue, make, toArray

Methods inherited from class java.lang.Object

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

Methods inherited from interface de.lmu.ifi.dbs.elki.data.NumberVector

byteValue, floatValue, getMax, getMin, getValue, intValue, shortValue

Methods inherited from interface de.lmu.ifi.dbs.elki.data.FeatureVector

toString

Field Detail

dims

private long[] dims

The selected dimensions.

Constructor Detail

ProjectedCentroid

public ProjectedCentroid(long[] dims,
                         int dim)

Constructor for updating use.

Parameters:

dims - Dimensions to use (indexed with 0)

dim - Full dimensionality

Method Detail

put

public void put(double[] val)

Add a single value with weight 1.0.

Overrides:

put in class Centroid

Parameters:

val - Value

put

public void put(double[] val,
                double weight)

Add data with a given weight.

Overrides:

put in class Centroid

Parameters:

val - data

weight - weight

put

public void put(NumberVector val)

Add a single value with weight 1.0.

Overrides:

put in class Centroid

Parameters:

val - Value

put

public void put(NumberVector val,
                double weight)

Add data with a given weight.

Overrides:

put in class Centroid

Parameters:

val - data

weight - weight

make

public static ProjectedCentroid make(long[] dims,
                                     Relation<? extends NumberVector> relation)

Static Constructor from a relation.

Parameters:

dims - Dimensions to use (indexed with 0)

relation - Relation to process

Returns:

Centroid

make

public static ProjectedCentroid make(long[] dims,
                                     Relation<? extends NumberVector> relation,
                                     DBIDs ids)

Static Constructor from a relation.

Parameters:

dims - Dimensions to use (indexed with 0)

relation - Relation to process

ids - IDs to process

Returns:

Centroid