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

Class StandardCovarianceMatrixBuilder<V extends NumberVector<?>>

java.lang.Object

de.lmu.ifi.dbs.elki.math.linearalgebra.pca.AbstractCovarianceMatrixBuilder<V>

de.lmu.ifi.dbs.elki.math.linearalgebra.pca.StandardCovarianceMatrixBuilder<V>

Type Parameters:

V - Vector class to use.

All Implemented Interfaces:

CovarianceMatrixBuilder<V>, InspectionUtilFrequentlyScanned, Parameterizable

public class StandardCovarianceMatrixBuilder<V extends NumberVector<?>>
extends AbstractCovarianceMatrixBuilder<V>

Class for building a "traditional" covariance matrix. Reasonable default choice for a CovarianceMatrixBuilder

Constructor Summary

Constructors

Constructor and Description
StandardCovarianceMatrixBuilder()

Method Summary

Methods

Modifier and Type	Method and Description
Matrix	processDatabase(Relation<? extends V> database) Compute Covariance Matrix for a complete database.
Matrix	processIds(DBIDs ids, Relation<? extends V> database) Compute Covariance Matrix for a collection of database IDs.

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

processQueryResults, processQueryResults

Methods inherited from class java.lang.Object

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

Constructor Detail

StandardCovarianceMatrixBuilder

public StandardCovarianceMatrixBuilder()

Method Detail

processDatabase

public Matrix processDatabase(Relation<? extends V> database)

Compute Covariance Matrix for a complete database.

Specified by:

processDatabase in interface CovarianceMatrixBuilder<V extends NumberVector<?>>

Overrides:

processDatabase in class AbstractCovarianceMatrixBuilder<V extends NumberVector<?>>

Parameters:

database - the database used

Returns:

Covariance Matrix

processIds

public Matrix processIds(DBIDs ids,
                Relation<? extends V> database)

Compute Covariance Matrix for a collection of database IDs.

Specified by:

processIds in interface CovarianceMatrixBuilder<V extends NumberVector<?>>

Specified by:

processIds in class AbstractCovarianceMatrixBuilder<V extends NumberVector<?>>

Parameters:

ids - a collection of ids

database - the database used

Returns:

Covariance Matrix