Package org.ejml.dense.row.decomposition.svd

Class SvdImplicitQrDecompose_Ultimate

java.lang.Object

org.ejml.dense.row.decomposition.svd.SvdImplicitQrDecompose_Ultimate

All Implemented Interfaces:

org.ejml.interfaces.decomposition.DecompositionInterface<org.ejml.data.DMatrixRMaj>, org.ejml.interfaces.decomposition.SingularValueDecomposition<org.ejml.data.DMatrixRMaj>, org.ejml.interfaces.decomposition.SingularValueDecomposition_F64<org.ejml.data.DMatrixRMaj>

public class SvdImplicitQrDecompose_Ultimate
extends Object
implements org.ejml.interfaces.decomposition.SingularValueDecomposition_F64<org.ejml.data.DMatrixRMaj>

Similar to SvdImplicitQrDecompose_DDRM 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	Description
SvdImplicitQrDecompose_Ultimate(boolean compact, boolean computeU, boolean computeV)

Method Summary

Modifier and Type	Method	Description
boolean	decompose(org.ejml.data.DMatrixRMaj orig)
double[]	getSingularValues()
org.ejml.data.DMatrixRMaj	getU(@Nullable org.ejml.data.DMatrixRMaj U, boolean transpose)
org.ejml.data.DMatrixRMaj	getV(@Nullable org.ejml.data.DMatrixRMaj V, boolean transpose)
org.ejml.data.DMatrixRMaj	getW(@Nullable org.ejml.data.DMatrixRMaj 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 Details

SvdImplicitQrDecompose_Ultimate

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

Method Details

getSingularValues

public double[] getSingularValues()

Specified by:

getSingularValues in interface org.ejml.interfaces.decomposition.SingularValueDecomposition_F64<org.ejml.data.DMatrixRMaj>

numberOfSingularValues

public int numberOfSingularValues()

Specified by:

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

isCompact

public boolean isCompact()

Specified by:

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

getU

public org.ejml.data.DMatrixRMaj getU(@Nullable
 @Nullable org.ejml.data.DMatrixRMaj U,
 boolean transpose)

Specified by:

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

getV

public org.ejml.data.DMatrixRMaj getV(@Nullable
 @Nullable org.ejml.data.DMatrixRMaj V,
 boolean transpose)

Specified by:

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

getW

public org.ejml.data.DMatrixRMaj getW(@Nullable
 @Nullable org.ejml.data.DMatrixRMaj W)

Specified by:

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

decompose

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

Specified by:

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

inputModified

public boolean inputModified()

Specified by:

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

numRows

public int numRows()

Specified by:

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

numCols

public int numCols()

Specified by:

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