cern.colt.matrix.tfloat.algo.solver
Class FloatQMR

java.lang.Object
  cern.colt.matrix.tfloat.algo.solver.AbstractFloatIterativeSolver
      cern.colt.matrix.tfloat.algo.solver.FloatQMR

All Implemented Interfaces:

FloatIterativeSolver

public class FloatQMR
extends AbstractFloatIterativeSolver

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

FloatQMR(FloatMatrix1D template)
Constructor for QMR.

FloatQMR(FloatMatrix1D template, FloatPreconditioner M1, FloatPreconditioner M2)
Constructor for QMR.

Method Summary

void	setPreconditioner(FloatPreconditioner M) Sets preconditioner
FloatMatrix1D	solve(FloatMatrix2D A, FloatMatrix1D b, FloatMatrix1D x) Solves the given problem, writing result into the vector.

Methods inherited from class cern.colt.matrix.tfloat.algo.solver.AbstractFloatIterativeSolver

getIterationMonitor, getPreconditioner, setIterationMonitor

Methods inherited from class java.lang.Object

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

Constructor Detail

FloatQMR

public FloatQMR(FloatMatrix1D 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

FloatQMR

public FloatQMR(FloatMatrix1D template,
                FloatPreconditioner M1,
                FloatPreconditioner 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 FloatMatrix1D solve(FloatMatrix2D A,
                           FloatMatrix1D b,
                           FloatMatrix1D x)
                    throws IterativeSolverFloatNotConvergedException

Description copied from interface: FloatIterativeSolver

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:

IterativeSolverFloatNotConvergedException

setPreconditioner

public void setPreconditioner(FloatPreconditioner M)

Description copied from interface: FloatIterativeSolver

Sets preconditioner

Specified by:

setPreconditioner in interface FloatIterativeSolver

Overrides:

setPreconditioner in class AbstractFloatIterativeSolver

Parameters:

M - Preconditioner to use