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

Class PCAResult

java.lang.Object

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

Direct Known Subclasses:

PCAFilteredResult

public class PCAResult
extends java.lang.Object

Result class for Principal Component Analysis with some convenience methods

Since:

0.2

Author:

Erich Schubert

Field Summary

Fields

Modifier and Type	Field and Description
private EigenPair[]	eigenPairs The eigenpairs in decreasing order.
private double[]	eigenvalues The eigenvalues in decreasing order.
private double[][]	eigenvectors The eigenvectors in decreasing order to their corresponding eigenvalues.

Constructor Summary

Constructors

Constructor and Description
PCAResult(EigenPair[] eigenPairs) Build a PCA result from an existing set of EigenPairs.
PCAResult(EigenvalueDecomposition evd) Constructor from an eigenvalue decomposition.

Method Summary

Modifier and Type	Method and Description
EigenPair[]	getEigenPairs() Returns the eigenpairs of the object to which this PCA belongs to in decreasing order.
double[]	getEigenvalues() Returns the local PCA eigenvalues in decreasing order.
double[][]	getEigenvectors() Returns the local PCA eigenvectors, in rows.
private static EigenPair[]	processDecomposition(EigenvalueDecomposition evd) Convert an eigenvalue decomposition into EigenPair objects.

Methods inherited from class java.lang.Object

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

Field Detail

eigenPairs

private EigenPair[] eigenPairs

The eigenpairs in decreasing order.

eigenvalues

private double[] eigenvalues

The eigenvalues in decreasing order.

eigenvectors

private double[][] eigenvectors

The eigenvectors in decreasing order to their corresponding eigenvalues.

Constructor Detail

PCAResult

public PCAResult(EigenPair[] eigenPairs)

Build a PCA result from an existing set of EigenPairs.

Parameters:

eigenPairs - existing eigenpairs

PCAResult

public PCAResult(EigenvalueDecomposition evd)

Constructor from an eigenvalue decomposition.

Parameters:

evd - Eigenvalue decomposition

Method Detail

processDecomposition

private static EigenPair[] processDecomposition(EigenvalueDecomposition evd)

Convert an eigenvalue decomposition into EigenPair objects.

Parameters:

evd - Eigenvalue decomposition

Returns:

Eigenpairs

getEigenvectors

public final double[][] getEigenvectors()

Returns the local PCA eigenvectors, in rows.

Returns:

eigenvectors of the object.

getEigenvalues

public final double[] getEigenvalues()

Returns the local PCA eigenvalues in decreasing order.

Returns:

the eigenvalues

getEigenPairs

public final EigenPair[] getEigenPairs()

Returns the eigenpairs of the object to which this PCA belongs to in decreasing order.

Returns:

the eigenpairs