Package org.ejml.dense.row.linsol.qr

Class LinearSolverQrHouse_DDRM

java.lang.Object

org.ejml.dense.row.linsol.LinearSolverAbstract_DDRM

org.ejml.dense.row.linsol.qr.LinearSolverQrHouse_DDRM

All Implemented Interfaces:

org.ejml.interfaces.linsol.LinearSolver<org.ejml.data.DMatrixRMaj,org.ejml.data.DMatrixRMaj>, org.ejml.interfaces.linsol.LinearSolverDense<org.ejml.data.DMatrixRMaj>

public class LinearSolverQrHouse_DDRM
extends LinearSolverAbstract_DDRM

QR decomposition can be used to solve for systems. However, this is not as computationally efficient as LU decomposition and costs about 3n² flops.

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

Field Summary

Fields inherited from class org.ejml.dense.row.linsol.LinearSolverAbstract_DDRM

A, numCols, numRows

Constructor Summary

Constructors

Constructor	Description
LinearSolverQrHouse_DDRM()	Creates a linear solver that uses QR decomposition.

Method Summary

Modifier and Type	Method	Description
org.ejml.interfaces.decomposition.QRDecomposition<org.ejml.data.DMatrixRMaj>	getDecomposition()
boolean	modifiesA()
boolean	modifiesB()
double	quality()
boolean	setA(org.ejml.data.DMatrixRMaj A)	Performs QR decomposition on A
void	setMaxSize(int maxRows)
void	solve(org.ejml.data.DMatrixRMaj B, org.ejml.data.DMatrixRMaj X)	Solves for X using the QR decomposition.

Methods inherited from class org.ejml.dense.row.linsol.LinearSolverAbstract_DDRM

_setA, getA, invert

Methods inherited from class java.lang.Object

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

Constructor Details

LinearSolverQrHouse_DDRM

public LinearSolverQrHouse_DDRM()

Creates a linear solver that uses QR decomposition.

Method Details

setMaxSize

public void setMaxSize(int maxRows)

setA

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

Performs QR decomposition on A

Parameters:

A - not modified.

quality

public double quality()

solve

public void solve(org.ejml.data.DMatrixRMaj B,
 org.ejml.data.DMatrixRMaj 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 writen to. Modified.

modifiesA

public boolean modifiesA()

modifiesB

public boolean modifiesB()

getDecomposition

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