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

java.lang.Object
  de.lmu.ifi.dbs.elki.math.linearalgebra.Vector
      de.lmu.ifi.dbs.elki.math.linearalgebra.Centroid
          de.lmu.ifi.dbs.elki.math.linearalgebra.ProjectedCentroid

All Implemented Interfaces:

MatrixLike<Vector>, Serializable, Cloneable

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.

See Also:

Serialized Form

Field Summary

private BitSet	dims The selected dimensions.
private static long	serialVersionUID Serial version

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

wsum

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

elements

Constructor Summary

ProjectedCentroid(BitSet dims, int dim)
Constructor for updating use.

Method Summary

static ProjectedCentroid	make(BitSet dims, Relation<? extends NumberVector<?,?>> relation) Static Constructor from a relation.
static ProjectedCentroid	make(BitSet dims, Relation<? extends NumberVector<?,?>> relation, Iterable<DBID> 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

make, make, make, put, put, toVector

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

clone, copy, equals, euclideanLength, get, get, getArrayCopy, getArrayRef, getColumnDimensionality, getColumnVector, getDimensionality, getRowDimensionality, hashCode, increment, inverseVector, minus, minusEquals, minusEquals, minusTimes, minusTimesEquals, normalize, normF, plus, plusEquals, plusEquals, plusTimes, plusTimesEquals, projection, randomNormalizedVector, scalarProduct, set, set, setZero, sqrtVector, times, times, timesEquals, timesTranspose, toString, toStringNoWhitespace, transpose, transposeTimes, transposeTimes, unitVector

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

serialVersionUID

private static final long serialVersionUID

Serial version

See Also:

Constant Field Values

dims

private BitSet dims

The selected dimensions.

Constructor Detail

ProjectedCentroid

public ProjectedCentroid(BitSet 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(BitSet dims,
                                     Relation<? extends NumberVector<?,?>> relation)

Static Constructor from a relation.

Parameters:

dims - Dimensions to use (indexed with 0)

relation - Relation to process

make

public static ProjectedCentroid make(BitSet dims,
                                     Relation<? extends NumberVector<?,?>> relation,
                                     Iterable<DBID> ids)

Static Constructor from a relation.

Parameters:

dims - Dimensions to use (indexed with 0)

relation - Relation to process

ids - IDs to process