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

Class WeakEigenPairFilter

java.lang.Object

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

All Implemented Interfaces:

EigenPairFilter, InspectionUtilFrequentlyScanned, Parameterizable

@Title(value="Weak Eigenpair Filter")
@Description(value="Sorts the eigenpairs in decending order of their eigenvalues and returns those eigenpairs, whose eigenvalue is above the average (\'expected\') eigenvalue.")
public class WeakEigenPairFilter
extends Object
implements EigenPairFilter

The WeakEigenPairFilter sorts the eigenpairs in descending order of their eigenvalues and returns the first eigenpairs who are above the average mark as "strong", the others as "weak".

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	WeakEigenPairFilter.Parameterizer Parameterization class.

Field Summary

Fields

Modifier and Type	Field and Description
static double	DEFAULT_WALPHA The default value for walpha.
static OptionID	EIGENPAIR_FILTER_WALPHA OptionID for the weak alpha value of WeakEigenPairFilter, ProgressiveEigenPairFilter and SignificantEigenPairFilter
private double	walpha The noise tolerance level for weak eigenvectors

Constructor Summary

Constructors

Constructor and Description
WeakEigenPairFilter(double walpha) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
FilteredEigenPairs	filter(SortedEigenPairs eigenPairs) Filter eigenpairs

Methods inherited from class java.lang.Object

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

Field Detail

EIGENPAIR_FILTER_WALPHA

public static final OptionID EIGENPAIR_FILTER_WALPHA

OptionID for the weak alpha value of WeakEigenPairFilter, ProgressiveEigenPairFilter and SignificantEigenPairFilter

DEFAULT_WALPHA

public static final double DEFAULT_WALPHA

The default value for walpha.

See Also:

Constant Field Values

walpha

private double walpha

The noise tolerance level for weak eigenvectors

Constructor Detail

WeakEigenPairFilter

public WeakEigenPairFilter(double walpha)

Constructor.

Parameters:

walpha -

Method Detail

filter

public FilteredEigenPairs filter(SortedEigenPairs eigenPairs)

Filter eigenpairs

Specified by:

filter in interface EigenPairFilter

Parameters:

eigenPairs - the eigenPairs (i.e. the eigenvectors and

Returns:

the filtered eigenpairs