org.ejml.alg.dense.decomposition.svd

Class SvdImplicitQrDecompose_Ultimate

java.lang.Object

org.ejml.alg.dense.decomposition.svd.SvdImplicitQrDecompose_Ultimate

All Implemented Interfaces:

org.ejml.interfaces.decomposition.DecompositionInterface<org.ejml.data.DenseMatrix64F>, org.ejml.interfaces.decomposition.SingularValueDecomposition<org.ejml.data.DenseMatrix64F>

public class SvdImplicitQrDecompose_Ultimate
extends java.lang.Object
implements org.ejml.interfaces.decomposition.SingularValueDecomposition<org.ejml.data.DenseMatrix64F>

Similar to SvdImplicitQrDecompose_D64 but it employs the ultimate shift strategy. Ultimate shift involves first computing singular values then uses those to quickly compute the U and W matrices. For EVD this strategy seems to work very well, but for this problem it needs to have little benefit and makes the code more complex.

NOTE: This code is much faster for 2x2 matrices since it computes the eigenvalues in one step.

Constructor Summary

Constructors

Constructor and Description
SvdImplicitQrDecompose_Ultimate(boolean compact, boolean computeU, boolean computeV)

Method Summary

Modifier and Type	Method and Description
boolean	decompose(org.ejml.data.DenseMatrix64F orig)
double[]	getSingularValues()
org.ejml.data.DenseMatrix64F	getU(org.ejml.data.DenseMatrix64F U, boolean transpose)
org.ejml.data.DenseMatrix64F	getV(org.ejml.data.DenseMatrix64F V, boolean transpose)
org.ejml.data.DenseMatrix64F	getW(org.ejml.data.DenseMatrix64F W)
boolean	inputModified()
boolean	isCompact()
int	numberOfSingularValues()
int	numCols()
int	numRows()

Methods inherited from class java.lang.Object

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

Constructor Detail

SvdImplicitQrDecompose_Ultimate

public SvdImplicitQrDecompose_Ultimate(boolean compact,
                                       boolean computeU,
                                       boolean computeV)

Method Detail

getSingularValues

public double[] getSingularValues()

Specified by:

getSingularValues in interface org.ejml.interfaces.decomposition.SingularValueDecomposition<org.ejml.data.DenseMatrix64F>

numberOfSingularValues

public int numberOfSingularValues()

Specified by:

numberOfSingularValues in interface org.ejml.interfaces.decomposition.SingularValueDecomposition<org.ejml.data.DenseMatrix64F>

isCompact

public boolean isCompact()

Specified by:

isCompact in interface org.ejml.interfaces.decomposition.SingularValueDecomposition<org.ejml.data.DenseMatrix64F>

getU

public org.ejml.data.DenseMatrix64F getU(org.ejml.data.DenseMatrix64F U,
                                         boolean transpose)

Specified by:

getU in interface org.ejml.interfaces.decomposition.SingularValueDecomposition<org.ejml.data.DenseMatrix64F>

getV

public org.ejml.data.DenseMatrix64F getV(org.ejml.data.DenseMatrix64F V,
                                         boolean transpose)

Specified by:

getV in interface org.ejml.interfaces.decomposition.SingularValueDecomposition<org.ejml.data.DenseMatrix64F>

getW

public org.ejml.data.DenseMatrix64F getW(org.ejml.data.DenseMatrix64F W)

Specified by:

getW in interface org.ejml.interfaces.decomposition.SingularValueDecomposition<org.ejml.data.DenseMatrix64F>

decompose

public boolean decompose(org.ejml.data.DenseMatrix64F orig)

Specified by:

decompose in interface org.ejml.interfaces.decomposition.DecompositionInterface<org.ejml.data.DenseMatrix64F>

inputModified

public boolean inputModified()

Specified by:

inputModified in interface org.ejml.interfaces.decomposition.DecompositionInterface<org.ejml.data.DenseMatrix64F>

numRows

public int numRows()

Specified by:

numRows in interface org.ejml.interfaces.decomposition.SingularValueDecomposition<org.ejml.data.DenseMatrix64F>

numCols

public int numCols()

Specified by:

numCols in interface org.ejml.interfaces.decomposition.SingularValueDecomposition<org.ejml.data.DenseMatrix64F>