org.openimaj.math.matrix.algorithm.pca

Class PrincipalComponentAnalysis.PercentageEnergyComponentSelector

java.lang.Object

org.openimaj.math.matrix.algorithm.pca.PrincipalComponentAnalysis.PercentageEnergyComponentSelector

All Implemented Interfaces:

PrincipalComponentAnalysis.ComponentSelector

Enclosing class:

PrincipalComponentAnalysis

public static class PrincipalComponentAnalysis.PercentageEnergyComponentSelector
extends Object
implements PrincipalComponentAnalysis.ComponentSelector

PrincipalComponentAnalysis.ComponentSelector that selects a subset of the principal components such that all remaining components have a certain percentage cumulative energy of the total. The percentage is calculated relative to the total energy of the eigenvalues. Bear in mind that if not all the eigenvalues were calculated, or if some have previously been removed through PrincipalComponentAnalysis.selectSubset(int), PrincipalComponentAnalysis.selectSubsetEnergyThreshold(double) or PrincipalComponentAnalysis.selectSubsetPercentageEnergy(double), then the percentage calculation only factors in the remaining eigenvalues that are available to it.

Author:

Jonathon Hare (jsh2@ecs.soton.ac.uk)

Constructor Summary

Constructors

Constructor and Description
PercentageEnergyComponentSelector(double percentage) Construct with the given percentage

Method Summary

Modifier and Type	Method and Description
void	select(PrincipalComponentAnalysis pca) Select a subset of principal components, discarding the ones not selected

Methods inherited from class java.lang.Object

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

Constructor Detail

PercentageEnergyComponentSelector

public PercentageEnergyComponentSelector(double percentage)

Construct with the given percentage

Parameters:

percentage - percentage of the total cumulative energy to retain [0..1].

Method Detail

select

public void select(PrincipalComponentAnalysis pca)

Description copied from interface: PrincipalComponentAnalysis.ComponentSelector

Select a subset of principal components, discarding the ones not selected

Specified by:

select in interface PrincipalComponentAnalysis.ComponentSelector