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:

DecompositionInterface<DenseMatrix64F>, TridiagonalSimilarDecomposition<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

TridiagonalDecompositionBlock()

TridiagonalDecompositionBlock(int blockSize)

Method Summary

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.alg.dense.decomposition.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.