org.ejml.alg.dense.decomposition.lu

Class LUDecompositionBase_D64

java.lang.Object

org.ejml.alg.dense.decomposition.lu.LUDecompositionBase_D64

All Implemented Interfaces:

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

Direct Known Subclasses:

LUDecompositionAlt_D64

public abstract class LUDecompositionBase_D64
extends java.lang.Object
implements org.ejml.interfaces.decomposition.LUDecomposition<org.ejml.data.DenseMatrix64F>

Contains common data structures and operations for LU decomposition algorithms.

Field Summary

Fields

Modifier and Type	Field and Description
protected double[]	dataLU
protected int[]	indx
protected org.ejml.data.DenseMatrix64F	LU
protected int	m
protected int	maxWidth
protected int	n
protected int[]	pivot
protected double	pivsign
protected double[]	vv

Constructor Summary

Constructors

Constructor and Description
LUDecompositionBase_D64()

Method Summary

Modifier and Type	Method and Description
double[]	_getVV()
void	_solveVectorInternal(double[] vv) a specialized version of solve that avoid additional checks that are not needed.
org.ejml.data.Complex64F	computeDeterminant() Computes the determinant from the LU decomposition.
protected void	decomposeCommonInit(org.ejml.data.DenseMatrix64F a)
int[]	getIndx()
org.ejml.data.DenseMatrix64F	getLower(org.ejml.data.DenseMatrix64F lower) Writes the lower triangular matrix into the specified matrix.
org.ejml.data.DenseMatrix64F	getLU()
int[]	getPivot()
org.ejml.data.DenseMatrix64F	getPivot(org.ejml.data.DenseMatrix64F pivot)
org.ejml.data.DenseMatrix64F	getUpper(org.ejml.data.DenseMatrix64F upper) Writes the upper triangular matrix into the specified matrix.
boolean	inputModified()
boolean	isSingular() Determines if the decomposed matrix is singular.
double	quality()
void	setExpectedMaxSize(int numRows, int numCols)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.ejml.interfaces.decomposition.DecompositionInterface

decompose

Field Detail

LU

protected org.ejml.data.DenseMatrix64F LU

maxWidth

protected int maxWidth

m

protected int m

n

protected int n

dataLU

protected double[] dataLU

vv

protected double[] vv

indx

protected int[] indx

pivot

protected int[] pivot

pivsign

protected double pivsign

Constructor Detail

LUDecompositionBase_D64

public LUDecompositionBase_D64()

Method Detail

setExpectedMaxSize

public void setExpectedMaxSize(int numRows,
                               int numCols)

getLU

public org.ejml.data.DenseMatrix64F getLU()

getIndx

public int[] getIndx()

getPivot

public int[] getPivot()

inputModified

public boolean inputModified()

Specified by:

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

getLower

public org.ejml.data.DenseMatrix64F getLower(org.ejml.data.DenseMatrix64F lower)

Writes the lower triangular matrix into the specified matrix.

Specified by:

getLower in interface org.ejml.interfaces.decomposition.LUDecomposition<org.ejml.data.DenseMatrix64F>

Parameters:

lower - Where the lower triangular matrix is writen to.

getUpper

public org.ejml.data.DenseMatrix64F getUpper(org.ejml.data.DenseMatrix64F upper)

Writes the upper triangular matrix into the specified matrix.

Specified by:

getUpper in interface org.ejml.interfaces.decomposition.LUDecomposition<org.ejml.data.DenseMatrix64F>

Parameters:

upper - Where the upper triangular matrix is writen to.

getPivot

public org.ejml.data.DenseMatrix64F getPivot(org.ejml.data.DenseMatrix64F pivot)

Specified by:

getPivot in interface org.ejml.interfaces.decomposition.LUDecomposition<org.ejml.data.DenseMatrix64F>

decomposeCommonInit

protected void decomposeCommonInit(org.ejml.data.DenseMatrix64F a)

isSingular

public boolean isSingular()

Determines if the decomposed matrix is singular. This function can return false and the matrix be almost singular, which is still bad.

Specified by:

isSingular in interface org.ejml.interfaces.decomposition.LUDecomposition<org.ejml.data.DenseMatrix64F>

Returns:

true if singular false otherwise.

computeDeterminant

public org.ejml.data.Complex64F computeDeterminant()

Computes the determinant from the LU decomposition.

Specified by:

computeDeterminant in interface org.ejml.interfaces.decomposition.LUDecomposition<org.ejml.data.DenseMatrix64F>

Returns:

The matrix's determinant.

quality

public double quality()

_solveVectorInternal

public void _solveVectorInternal(double[] vv)

a specialized version of solve that avoid additional checks that are not needed.

_getVV

public double[] _getVV()