Package elki.math.linearalgebra.pca

Interface CovarianceMatrixBuilder

All Known Implementing Classes:

RANSACCovarianceMatrixBuilder, StandardCovarianceMatrixBuilder, WeightedCovarianceMatrixBuilder

public interface CovarianceMatrixBuilder

Interface for computing covariance matrixes on a data set.

Since:

0.2

Author:

Erich Schubert

Method Summary

Modifier and Type	Method	Description
double[][]	processIds(DBIDs ids, Relation<? extends NumberVector> database)	Compute covariance matrix for a collection of database IDs.
default double[][]	processQueryResults(DoubleDBIDList results, Relation<? extends NumberVector> database)	Compute covariance matrix for a QueryResult Collection.
default double[][]	processQueryResults(DoubleDBIDList results, Relation<? extends NumberVector> database, int k)	Compute covariance matrix for a QueryResult collection.
default double[][]	processRelation(Relation<? extends NumberVector> relation)	Compute covariance matrix for a complete relation.

Method Detail

processRelation

default double[][] processRelation(Relation<? extends NumberVector> relation)

Compute covariance matrix for a complete relation.

Parameters:

relation - the relation to run on

Returns:

covariance matrix

processIds

double[][] processIds(DBIDs ids,
                      Relation<? extends NumberVector> database)

Compute covariance matrix for a collection of database IDs.

Parameters:

ids - a collection of ids

database - the database used

Returns:

covariance matrix

processQueryResults

default double[][] processQueryResults(DoubleDBIDList results,
                                       Relation<? extends NumberVector> database,
                                       int k)

Compute covariance matrix for a QueryResult collection.

By default it will just run processIds, but subclasses may use the distances for weighting.

Parameters:

results - a collection of QueryResults

database - the database used

k - the number of entries to process

Returns:

covariance matrix

processQueryResults

default double[][] processQueryResults(DoubleDBIDList results,
                                       Relation<? extends NumberVector> database)

Compute covariance matrix for a QueryResult Collection.

By default it will just collect the ids and run processIds, but subclasses may use the distance for weighting.

Parameters:

results - a collection of QueryResults

database - the database used

Returns:

covariance matrix