cern.colt.matrix.tdouble.algo.solver

Class DoubleQMR

java.lang.Object

cern.colt.matrix.tdouble.algo.solver.AbstractDoubleIterativeSolver

cern.colt.matrix.tdouble.algo.solver.DoubleQMR

All Implemented Interfaces:

DoubleIterativeSolver

public class DoubleQMR
extends AbstractDoubleIterativeSolver

Quasi-Minimal Residual method. QMR solves the unsymmetric linear system Ax = b using the Quasi-Minimal Residual method. QMR uses two preconditioners, and by default these are the same preconditioner.

Author:

Templates

Constructor Summary

Constructors

Constructor and Description
DoubleQMR(DoubleMatrix1D template) Constructor for QMR.
DoubleQMR(DoubleMatrix1D template, DoublePreconditioner M1, DoublePreconditioner M2) Constructor for QMR.

Method Summary

Methods

Modifier and Type	Method and Description
void	setPreconditioner(DoublePreconditioner M) Sets preconditioner
DoubleMatrix1D	solve(DoubleMatrix2D A, DoubleMatrix1D b, DoubleMatrix1D x) Solves the given problem, writing result into the vector.

Methods inherited from class cern.colt.matrix.tdouble.algo.solver.AbstractDoubleIterativeSolver

getIterationMonitor, getPreconditioner, setIterationMonitor

Methods inherited from class java.lang.Object

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

Constructor Detail

DoubleQMR

public DoubleQMR(DoubleMatrix1D template)

Constructor for QMR. Uses the given vector as template for creating scratch vectors. Typically, the solution or the right hand side vector can be passed, and the template is not modified

Parameters:

template - Vector to use as template for the work vectors needed in the solution process

DoubleQMR

public DoubleQMR(DoubleMatrix1D template,
         DoublePreconditioner M1,
         DoublePreconditioner M2)

Constructor for QMR. Uses the given vector as template for creating scratch vectors. Typically, the solution or the right hand side vector can be passed, and the template is not modified. Allows setting different right and left preconditioners

Parameters:

template - Vector to use as template for the work vectors needed in the solution process

M1 - Left preconditioner

M2 - Right preconditioner

Method Detail

solve

public DoubleMatrix1D solve(DoubleMatrix2D A,
                   DoubleMatrix1D b,
                   DoubleMatrix1D x)
                     throws IterativeSolverDoubleNotConvergedException

Description copied from interface: DoubleIterativeSolver

Solves the given problem, writing result into the vector.

Parameters:

A - Matrix of the problem

b - Right hand side

x - Solution is stored here. Also used as initial guess

Returns:

The solution vector x

Throws:

IterativeSolverDoubleNotConvergedException

setPreconditioner

public void setPreconditioner(DoublePreconditioner M)

Description copied from interface: DoubleIterativeSolver

Sets preconditioner

Specified by:

setPreconditioner in interface DoubleIterativeSolver

Overrides:

setPreconditioner in class AbstractDoubleIterativeSolver

Parameters:

M - Preconditioner to use