Dune::PDELab::GridOperatorPreconditioner< PrecGO > Class Template Reference

Turn a grid operator that represents a preconditioner into an ISTL preconditioner. More...

#include <dune/pdelab/backend/istl/matrixfree/gridoperatorpreconditioner.hh>

Public Types
typedef PrecGO::Traits::Domain	domain_type
	The domain type of the preconditioner.
typedef PrecGO::Traits::Range	range_type
	The range type of the preconditioner.
typedef X::field_type	field_type
	The field type of the preconditioner.

Public Member Functions
Dune::SolverCategory::Category	category () const override
	Category of the preconditioner (see SolverCategory::Category)
void	setLinearizationPoint (const Domain &u)
void	pre (Domain &v, Range &d) override
	prepare preconditioner
void	apply (Domain &v, const Range &d) override
	Apply one step of the preconditioner to the system A(v)=d. More...
void	post (Domain &v) override
	Clean up. More...

Detailed Description

template<class PrecGO>
class Dune::PDELab::GridOperatorPreconditioner< PrecGO >

Turn a grid operator that represents a preconditioner into an ISTL preconditioner.

Template Parameters

PrecGO

Grid operator implementing the matrix-free preconditioner application

Member Function Documentation

apply()

template<class PrecGO >

void Dune::PDELab::GridOperatorPreconditioner< PrecGO >::apply ( Domain &  v, const Range &  d  )

inlineoverridevirtual

Apply one step of the preconditioner to the system A(v)=d.

On entry v=0 and d=b-A(x) (although this might not be computed in that way. On exit v contains the update, i.e one step computes \( v = M^{-1} d \) where \( M \) is the approximate inverse of the operator \( A \) characterizing the preconditioner.

Parameters

[out]	v	The update to be computed
	d	The current defect.

Implements Dune::Preconditioner< PrecGO::Traits::Domain, PrecGO::Traits::Range >.

post()

template<class PrecGO >

void Dune::PDELab::GridOperatorPreconditioner< PrecGO >::post ( Domain &  x )

inlineoverridevirtual

Clean up.

This method is called after the last apply call for the linear system to be solved. Memory may be deallocated safely here. x is the solution of the linear equation.

Parameters

x	The right hand side of the equation.

Implements Dune::Preconditioner< PrecGO::Traits::Domain, PrecGO::Traits::Range >.

setLinearizationPoint()

template<class PrecGO >

void Dune::PDELab::GridOperatorPreconditioner< PrecGO >::setLinearizationPoint ( const Domain &  u )

inline

Set linearization point Must be called before apply() for nonlinear problems.

Referenced by Dune::PDELab::ISTLBackend_SEQ_MatrixFree_Base< GO, PrecGO, Solver >::setLinearizationPoint().

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The documentation for this class was generated from the following file:

• dune/pdelab/backend/istl/matrixfree/gridoperatorpreconditioner.hh