org.ejml.alg.dense.linsol.qr

Class LinearSolverQr_CD64

java.lang.Object

org.ejml.alg.dense.linsol.LinearSolverAbstract_CD64

org.ejml.alg.dense.linsol.qr.LinearSolverQr_CD64

All Implemented Interfaces:

org.ejml.interfaces.linsol.LinearSolver<org.ejml.data.CDenseMatrix64F>

public class LinearSolverQr_CD64
extends LinearSolverAbstract_CD64

A solver for a generic QR decomposition algorithm. This will in general be a bit slower than the specialized once since the full Q and R matrices need to be extracted.

It solve for x by first multiplying b by the transpose of Q then solving for the result.
QRx=b
Rx=Q^H b

Field Summary

Fields

Modifier and Type	Field and Description
protected int	maxCols
protected int	maxRows
protected org.ejml.data.CDenseMatrix64F	Q
protected org.ejml.data.CDenseMatrix64F	Qt
protected org.ejml.data.CDenseMatrix64F	R

Fields inherited from class org.ejml.alg.dense.linsol.LinearSolverAbstract_CD64

A, numCols, numRows, stride

Constructor Summary

Constructors

Constructor and Description
LinearSolverQr_CD64(org.ejml.interfaces.decomposition.QRDecomposition<org.ejml.data.CDenseMatrix64F> decomposer) Creates a linear solver that uses QR decomposition.

Method Summary

Modifier and Type	Method and Description
org.ejml.interfaces.decomposition.QRDecomposition<org.ejml.data.CDenseMatrix64F>	getDecomposer()
org.ejml.interfaces.decomposition.QRDecomposition<org.ejml.data.CDenseMatrix64F>	getDecomposition()
org.ejml.data.CDenseMatrix64F	getQ()
org.ejml.data.CDenseMatrix64F	getR()
boolean	modifiesA()
boolean	modifiesB()
double	quality()
boolean	setA(org.ejml.data.CDenseMatrix64F A) Performs QR decomposition on A
void	setMaxSize(int maxRows, int maxCols) Changes the size of the matrix it can solve for
void	solve(org.ejml.data.CDenseMatrix64F B, org.ejml.data.CDenseMatrix64F X) Solves for X using the QR decomposition.

Methods inherited from class org.ejml.alg.dense.linsol.LinearSolverAbstract_CD64

_setA, getA, invert

Methods inherited from class java.lang.Object

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

Field Detail

maxRows

protected int maxRows

maxCols

protected int maxCols

Q

protected org.ejml.data.CDenseMatrix64F Q

Qt

protected org.ejml.data.CDenseMatrix64F Qt

R

protected org.ejml.data.CDenseMatrix64F R

Constructor Detail

LinearSolverQr_CD64

public LinearSolverQr_CD64(org.ejml.interfaces.decomposition.QRDecomposition<org.ejml.data.CDenseMatrix64F> decomposer)

Creates a linear solver that uses QR decomposition.

Method Detail

setMaxSize

public void setMaxSize(int maxRows,
                       int maxCols)

Changes the size of the matrix it can solve for

Parameters:

maxRows - Maximum number of rows in the matrix it will decompose.

maxCols - Maximum number of columns in the matrix it will decompose.

setA

public boolean setA(org.ejml.data.CDenseMatrix64F A)

Performs QR decomposition on A

Parameters:

A - not modified.

quality

public double quality()

solve

public void solve(org.ejml.data.CDenseMatrix64F B,
                  org.ejml.data.CDenseMatrix64F X)

Solves for X using the QR decomposition.

Parameters:

B - A matrix that is n by m. Not modified.

X - An n by m matrix where the solution is written to. Modified.

modifiesA

public boolean modifiesA()

modifiesB

public boolean modifiesB()

getDecomposition

public org.ejml.interfaces.decomposition.QRDecomposition<org.ejml.data.CDenseMatrix64F> getDecomposition()

getDecomposer

public org.ejml.interfaces.decomposition.QRDecomposition<org.ejml.data.CDenseMatrix64F> getDecomposer()

getQ

public org.ejml.data.CDenseMatrix64F getQ()

getR

public org.ejml.data.CDenseMatrix64F getR()