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Belos::CGSingleRedIter< ScalarType, MV, OP > Class Template Reference

This class implements the preconditioned single-reduction Conjugate Gradient (CG) iteration. More...

#include <BelosCGSingleRedIter.hpp>

Inheritance diagram for Belos::CGSingleRedIter< ScalarType, MV, OP >:
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Public Types

typedef MultiVecTraits
< ScalarType, MV > 		MVT
 
typedef OperatorTraits
< ScalarType, MV, OP > 		OPT
 
typedef Teuchos::ScalarTraits
< ScalarType > 		SCT
 
typedef SCT::magnitudeType MagnitudeType
 

Public Member Functions

Constructors/Destructor
 CGSingleRedIter (const Teuchos::RCP< LinearProblem< ScalarType, MV, OP > > &problem, const Teuchos::RCP< OutputManager< ScalarType > > &printer, const Teuchos::RCP< StatusTest< ScalarType, MV, OP > > &tester, const Teuchos::RCP< StatusTestGenResNorm< ScalarType, MV, OP > > &convTester, Teuchos::ParameterList &params)
 CGSingleRedIter constructor with linear problem, solver utilities, and parameter list of solver options. More...
 
virtual ~CGSingleRedIter ()
 Destructor. More...
 
Solver methods
void iterate ()
 This method performs CG iterations until the status test indicates the need to stop or an error occurs (in which case, an std::exception is thrown). More...
 
void initializeCG (CGIterationState< ScalarType, MV > &newstate)
 Initialize the solver to an iterate, providing a complete state. More...
 
void initialize ()
 Initialize the solver with the initial vectors from the linear problem or random data. More...
 
CGIterationState< ScalarType, MV > getState () const
 Get the current state of the linear solver. More...
 
Status methods
int getNumIters () const
 Get the current iteration count. More...
 
void resetNumIters (int iter=0)
 Reset the iteration count. More...
 
Teuchos::RCP< const MV > getNativeResiduals (std::vector< MagnitudeType > *norms) const
 Get the norms of the residuals native to the solver. More...
 
Teuchos::RCP< MV > getCurrentUpdate () const
 Get the current update to the linear system. More...
 
Accessor methods
const LinearProblem
< ScalarType, MV, OP > & 		getProblem () const
 Get a constant reference to the linear problem. More...
 
int getBlockSize () const
 Get the blocksize to be used by the iterative solver in solving this linear problem. More...
 
void setBlockSize (int blockSize)
 Set the blocksize to be used by the iterative solver in solving this linear problem. More...
 
bool isInitialized ()
 States whether the solver has been initialized or not. More...
 
void setDoCondEst (bool)
 Sets whether or not to store the diagonal for condition estimation. More...
 
Teuchos::ArrayView< MagnitudeType > getDiag ()
 Gets the diagonal for condition estimation (NOT_IMPLEMENTED) More...
 
Teuchos::ArrayView< MagnitudeType > getOffDiag ()
 Gets the off-diagonal for condition estimation (NOT_IMPLEMENTED) More...
 
State methods
- Public Member Functions inherited from Belos::Iteration< ScalarType, MV, OP >
 Iteration ()
 Default Constructor. More...
 
virtual ~Iteration ()
 Destructor. More...
 
virtual Teuchos::RCP< const MV > getNativeResiduals (std::vector< typename Teuchos::ScalarTraits< ScalarType >::magnitudeType > *norms) const =0
 Get the residuals native to the solver. More...
 

Detailed Description

template<class ScalarType, class MV, class OP>
class Belos::CGSingleRedIter< ScalarType, MV, OP >

This class implements the preconditioned single-reduction Conjugate Gradient (CG) iteration.

Author
Heidi Thornquist

Definition at line 47 of file BelosCGSingleRedIter.hpp.

Member Typedef Documentation

template<class ScalarType , class MV , class OP >
typedef MultiVecTraits<ScalarType,MV> Belos::CGSingleRedIter< ScalarType, MV, OP >::MVT

Definition at line 54 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
typedef OperatorTraits<ScalarType,MV,OP> Belos::CGSingleRedIter< ScalarType, MV, OP >::OPT

Definition at line 55 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
typedef Teuchos::ScalarTraits<ScalarType> Belos::CGSingleRedIter< ScalarType, MV, OP >::SCT

Definition at line 56 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
typedef SCT::magnitudeType Belos::CGSingleRedIter< ScalarType, MV, OP >::MagnitudeType

Definition at line 57 of file BelosCGSingleRedIter.hpp.

Constructor & Destructor Documentation

template<class ScalarType , class MV , class OP >
Belos::CGSingleRedIter< ScalarType, MV, OP >::CGSingleRedIter ( const Teuchos::RCP< LinearProblem< ScalarType, MV, OP > > &  problem,
const Teuchos::RCP< OutputManager< ScalarType > > &  printer,
const Teuchos::RCP< StatusTest< ScalarType, MV, OP > > &  tester,
const Teuchos::RCP< StatusTestGenResNorm< ScalarType, MV, OP > > &  convTester,
Teuchos::ParameterList &  params 
)

CGSingleRedIter constructor with linear problem, solver utilities, and parameter list of solver options.

This constructor takes pointers required by the linear solver iteration, in addition to a parameter list of options for the linear solver.

Definition at line 263 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
virtual Belos::CGSingleRedIter< ScalarType, MV, OP >::~CGSingleRedIter ( )
inlinevirtual

Destructor.

Definition at line 74 of file BelosCGSingleRedIter.hpp.

Member Function Documentation

template<class ScalarType , class MV , class OP >
void Belos::CGSingleRedIter< ScalarType, MV, OP >::iterate ( )
virtual

This method performs CG iterations until the status test indicates the need to stop or an error occurs (in which case, an std::exception is thrown).

iterate() will first determine whether the solver is initialized; if not, it will call initialize() using default arguments. After initialization, the solver performs CG iterations until the status test evaluates as Passed, at which point the method returns to the caller.

The status test is queried at the beginning of the iteration.

Implements Belos::Iteration< ScalarType, MV, OP >.

Definition at line 430 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
void Belos::CGSingleRedIter< ScalarType, MV, OP >::initializeCG ( CGIterationState< ScalarType, MV > &  newstate)
virtual

Initialize the solver to an iterate, providing a complete state.

The CGSingleRedIter contains a certain amount of state, consisting of the current residual, preconditioned residual, and decent direction.

initialize() gives the user the opportunity to manually set these, although only the current unpreconditioned residual is required.

Postcondition
isInitialized() == true (see post-conditions of isInitialize())
Note
For any pointer in newstate which directly points to the multivectors in the solver, the data is not copied.

Implements Belos::CGIteration< ScalarType, MV, OP >.

Definition at line 349 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
void Belos::CGSingleRedIter< ScalarType, MV, OP >::initialize ( )
inlinevirtual

Initialize the solver with the initial vectors from the linear problem or random data.

Implements Belos::Iteration< ScalarType, MV, OP >.

Definition at line 114 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
CGIterationState<ScalarType,MV> Belos::CGSingleRedIter< ScalarType, MV, OP >::getState ( ) const
inlinevirtual

Get the current state of the linear solver.

The data is only valid if isInitialized() == true.

Returns
A CGIterationState object containing const pointers to the current solver state.

Implements Belos::CGIteration< ScalarType, MV, OP >.

Definition at line 126 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
int Belos::CGSingleRedIter< ScalarType, MV, OP >::getNumIters ( ) const
inlinevirtual

Get the current iteration count.

Implements Belos::Iteration< ScalarType, MV, OP >.

Definition at line 142 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
void Belos::CGSingleRedIter< ScalarType, MV, OP >::resetNumIters ( int  iter = 0)
inlinevirtual

Reset the iteration count.

Implements Belos::Iteration< ScalarType, MV, OP >.

Definition at line 145 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
Teuchos::RCP< const MV > Belos::CGSingleRedIter< ScalarType, MV, OP >::getNativeResiduals ( std::vector< MagnitudeType > *  norms) const

Get the norms of the residuals native to the solver.

Returns
A std::vector of length blockSize containing the native residuals.

Definition at line 415 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
Teuchos::RCP<MV> Belos::CGSingleRedIter< ScalarType, MV, OP >::getCurrentUpdate ( ) const
inlinevirtual

Get the current update to the linear system.

Note
This method returns a null pointer because the linear problem is current.

Implements Belos::Iteration< ScalarType, MV, OP >.

Definition at line 154 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
const LinearProblem<ScalarType,MV,OP>& Belos::CGSingleRedIter< ScalarType, MV, OP >::getProblem ( ) const
inlinevirtual

Get a constant reference to the linear problem.

Implements Belos::Iteration< ScalarType, MV, OP >.

Definition at line 162 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
int Belos::CGSingleRedIter< ScalarType, MV, OP >::getBlockSize ( ) const
inlinevirtual

Get the blocksize to be used by the iterative solver in solving this linear problem.

Implements Belos::Iteration< ScalarType, MV, OP >.

Definition at line 165 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
void Belos::CGSingleRedIter< ScalarType, MV, OP >::setBlockSize ( int  blockSize)
inlinevirtual

Set the blocksize to be used by the iterative solver in solving this linear problem.

Implements Belos::Iteration< ScalarType, MV, OP >.

Definition at line 168 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
bool Belos::CGSingleRedIter< ScalarType, MV, OP >::isInitialized ( )
inlinevirtual

States whether the solver has been initialized or not.

Implements Belos::Iteration< ScalarType, MV, OP >.

Definition at line 174 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
void Belos::CGSingleRedIter< ScalarType, MV, OP >::setDoCondEst ( bool  )
inlinevirtual

Sets whether or not to store the diagonal for condition estimation.

Implements Belos::CGIteration< ScalarType, MV, OP >.

Definition at line 177 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
Teuchos::ArrayView<MagnitudeType> Belos::CGSingleRedIter< ScalarType, MV, OP >::getDiag ( )
inlinevirtual

Gets the diagonal for condition estimation (NOT_IMPLEMENTED)

Implements Belos::CGIteration< ScalarType, MV, OP >.

Definition at line 180 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
Teuchos::ArrayView<MagnitudeType> Belos::CGSingleRedIter< ScalarType, MV, OP >::getOffDiag ( )
inlinevirtual

Gets the off-diagonal for condition estimation (NOT_IMPLEMENTED)

Implements Belos::CGIteration< ScalarType, MV, OP >.

Definition at line 186 of file BelosCGSingleRedIter.hpp.

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