org.ejml.alg.dense.decomposition.hessenberg

Class TridiagonalDecompositionBlock

java.lang.Object

org.ejml.alg.dense.decomposition.BaseDecompositionBlock64

org.ejml.alg.dense.decomposition.hessenberg.TridiagonalDecompositionBlock

All Implemented Interfaces:

TridiagonalSimilarDecomposition<DenseMatrix64F>, DecompositionInterface<DenseMatrix64F>

public class TridiagonalDecompositionBlock
extends BaseDecompositionBlock64
implements TridiagonalSimilarDecomposition<DenseMatrix64F>

Wrapper around a block implementation of TridiagonalSimilarDecomposition

Author:

Peter Abeles

Field Summary

Fields inherited from class org.ejml.alg.dense.decomposition.BaseDecompositionBlock64

Ablock, alg, blockLength, tmp

Constructor Summary

Constructors

Constructor and Description
TridiagonalDecompositionBlock()
TridiagonalDecompositionBlock(int blockSize)

Method Summary

Methods

Modifier and Type	Method and Description
void	getDiagonal(double[] diag, double[] off) Extracts the diagonal and off diagonal elements of the decomposed tridiagonal matrix.
DenseMatrix64F	getQ(DenseMatrix64F Q, boolean transposed) An orthogonal matrix that has the following property: T = QTAQ
DenseMatrix64F	getT(DenseMatrix64F T) Extracts the tridiagonal matrix found in the decomposition.

Methods inherited from class org.ejml.alg.dense.decomposition.BaseDecompositionBlock64

convertBlockToRow, decompose, inputModified

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.ejml.factory.DecompositionInterface

decompose, inputModified

Constructor Detail

TridiagonalDecompositionBlock

public TridiagonalDecompositionBlock()

TridiagonalDecompositionBlock

public TridiagonalDecompositionBlock(int blockSize)

Method Detail

getT

public DenseMatrix64F getT(DenseMatrix64F T)

Description copied from interface: TridiagonalSimilarDecomposition

Extracts the tridiagonal matrix found in the decomposition.

Specified by:

getT in interface TridiagonalSimilarDecomposition<DenseMatrix64F>

Parameters:

T - If not null then the results will be stored here. Otherwise a new matrix will be created.

Returns:

The extracted T matrix.

getQ

public DenseMatrix64F getQ(DenseMatrix64F Q,
                  boolean transposed)

Description copied from interface: TridiagonalSimilarDecomposition

An orthogonal matrix that has the following property: T = Q^TAQ

Specified by:

getQ in interface TridiagonalSimilarDecomposition<DenseMatrix64F>

Parameters:

Q - If not null then the results will be stored here. Otherwise a new matrix will be created.

Returns:

The extracted Q matrix.

getDiagonal

public void getDiagonal(double[] diag,
               double[] off)

Description copied from interface: TridiagonalSimilarDecomposition

Extracts the diagonal and off diagonal elements of the decomposed tridiagonal matrix. Since it is symmetric only one off diagonal array is returned.

Specified by:

getDiagonal in interface TridiagonalSimilarDecomposition<DenseMatrix64F>

Parameters:

diag - Diagonal elements. Modified.

off - off diagonal elements. Modified.