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

This class implements the preconditioned transpose-free QMR algorithm for solving non-Hermitian linear systems of equations Ax = b, where b is the right-hand side std::vector and x is the corresponding solution. More...

#include <BelosTFQMRIter.hpp>

Inheritance diagram for Belos::TFQMRIter< ScalarType, MV, OP >:

Inheritance graph
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List of all members.

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

Constructor/Destructor.
 TFQMRIter (const Teuchos::RCP< LinearProblem< ScalarType, MV, OP > > &problem, const Teuchos::RCP< OutputManager< ScalarType > > &printer, const Teuchos::RCP< StatusTest< ScalarType, MV, OP > > &tester, Teuchos::ParameterList &params)
 BelosTFQMRIter constructor.
virtual ~TFQMRIter ()
 BelosTFQMRIter destructor.
Solver methods
void iterate ()
 This method performs block TFQMR iterations until the status test indicates the need to stop or an error occurs (in which case, an std::exception is thrown).
void initializeTFQMR (TFQMRIterState< ScalarType, MV > newstate)
 Initialize the solver to an iterate, providing a complete state.
void initialize ()
 Initialize the solver with the initial vectors from the linear problem or random data.
TFQMRIterState< ScalarType,
MV > 
getState () const
 Get the current state of the linear solver.
Status methods
int getNumIters () const
 Get the current iteration count.
void resetNumIters (int iter=0)
 Reset the iteration count.
Teuchos::RCP< const MV > getNativeResiduals (std::vector< MagnitudeType > *norms) const
 Get the norms of the residuals native to the solver.
Teuchos::RCP< MV > getCurrentUpdate () const
 Get the current update to the linear system.
Accessor methods
const LinearProblem< ScalarType,
MV, OP > & 
getProblem () const
 Get a constant reference to the linear problem.
int getBlockSize () const
 Get the blocksize to be used by the iterative solver in solving this linear problem.
void setBlockSize (int blockSize)
 Set the blocksize.
bool isInitialized ()
 States whether the solver has been initialized or not.

Detailed Description

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

This class implements the preconditioned transpose-free QMR algorithm for solving non-Hermitian linear systems of equations Ax = b, where b is the right-hand side std::vector and x is the corresponding solution.

Author:
Heidi Thornquist

Definition at line 131 of file BelosTFQMRIter.hpp.


Member Typedef Documentation

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

Definition at line 136 of file BelosTFQMRIter.hpp.

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

Definition at line 137 of file BelosTFQMRIter.hpp.

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

Definition at line 138 of file BelosTFQMRIter.hpp.

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

Definition at line 139 of file BelosTFQMRIter.hpp.


Constructor & Destructor Documentation

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

BelosTFQMRIter constructor.

Definition at line 335 of file BelosTFQMRIter.hpp.

template<class ScalarType, class MV, class OP>
virtual Belos::TFQMRIter< ScalarType, MV, OP >::~TFQMRIter (  )  [inline, virtual]

BelosTFQMRIter destructor.

Definition at line 151 of file BelosTFQMRIter.hpp.


Member Function Documentation

template<class ScalarType, class MV, class OP>
void Belos::TFQMRIter< ScalarType, MV, OP >::iterate (  )  [virtual]

This method performs block TFQMR 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 inintialized; if not, it will call initialize() using default arguments. After initialization, the solver performs block TFQMR iterations until the status test evaluates as Passed, at which point the method returns to the caller.

The block TFQMR iteration proceeds as follows:

  1. The operator problem->applyOp() is applied to the newest blockSize vectors in the Krylov basis.
  2. The resulting vectors are orthogonalized against the previous basis vectors, and made orthonormal.
  3. The Hessenberg matrix is updated.
  4. The least squares system is updated.

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

Possible exceptions thrown include the TFQMRIterOrthoFailure.

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

Definition at line 471 of file BelosTFQMRIter.hpp.

template<class ScalarType, class MV, class OP>
void Belos::TFQMRIter< ScalarType, MV, OP >::initializeTFQMR ( TFQMRIterState< ScalarType, MV >  newstate  ) 

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

The BlockTFQMRIter contains a certain amount of state, consisting of the current Krylov basis and the associated Hessenberg matrix.

initialize() gives the user the opportunity to manually set these, although this must be done with caution, abiding by the rules given below. All notions of orthogonality and orthonormality are derived from the inner product specified by the orthogonalization manager.

Postcondition:
isInitialized() == true (see post-conditions of isInitialize())
The user has the option of specifying any component of the state using initialize(). However, these arguments are assumed to match the post-conditions specified under isInitialized(). Any necessary component of the state not given to initialize() will be generated.

Note:
For any pointer in newstate which directly points to the multivectors in the solver, the data is not copied.

Definition at line 407 of file BelosTFQMRIter.hpp.

template<class ScalarType, class MV, class OP>
void Belos::TFQMRIter< ScalarType, MV, OP >::initialize (  )  [inline, virtual]

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

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

Definition at line 207 of file BelosTFQMRIter.hpp.

template<class ScalarType, class MV, class OP>
TFQMRIterState<ScalarType,MV> Belos::TFQMRIter< ScalarType, MV, OP >::getState (  )  const [inline]

Get the current state of the linear solver.

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

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

Definition at line 220 of file BelosTFQMRIter.hpp.

template<class ScalarType, class MV, class OP>
int Belos::TFQMRIter< ScalarType, MV, OP >::getNumIters (  )  const [inline, virtual]

Get the current iteration count.

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

Definition at line 238 of file BelosTFQMRIter.hpp.

template<class ScalarType, class MV, class OP>
void Belos::TFQMRIter< ScalarType, MV, OP >::resetNumIters ( int  iter = 0  )  [inline, virtual]

Reset the iteration count.

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

Definition at line 241 of file BelosTFQMRIter.hpp.

template<class ScalarType, class MV, class OP>
Teuchos::RCP< const MV > Belos::TFQMRIter< 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 359 of file BelosTFQMRIter.hpp.

template<class ScalarType, class MV, class OP>
Teuchos::RCP<MV> Belos::TFQMRIter< ScalarType, MV, OP >::getCurrentUpdate (  )  const [inline, virtual]

Get the current update to the linear system.

Note:
This method returns a null pointer because the linear problem is updated every iteration.

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

Definition at line 250 of file BelosTFQMRIter.hpp.

template<class ScalarType, class MV, class OP>
const LinearProblem<ScalarType,MV,OP>& Belos::TFQMRIter< ScalarType, MV, OP >::getProblem (  )  const [inline, virtual]

Get a constant reference to the linear problem.

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

Definition at line 259 of file BelosTFQMRIter.hpp.

template<class ScalarType, class MV, class OP>
int Belos::TFQMRIter< ScalarType, MV, OP >::getBlockSize (  )  const [inline, virtual]

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

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

Definition at line 262 of file BelosTFQMRIter.hpp.

template<class ScalarType, class MV, class OP>
void Belos::TFQMRIter< ScalarType, MV, OP >::setBlockSize ( int  blockSize  )  [inline, virtual]

Set the blocksize.

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

Definition at line 265 of file BelosTFQMRIter.hpp.

template<class ScalarType, class MV, class OP>
bool Belos::TFQMRIter< ScalarType, MV, OP >::isInitialized (  )  [inline, virtual]

States whether the solver has been initialized or not.

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

Definition at line 271 of file BelosTFQMRIter.hpp.


The documentation for this class was generated from the following file:
Generated on Wed May 12 21:30:10 2010 for Belos by  doxygen 1.4.7