Ifpack2_Chebyshev_decl.hpp

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//       Ifpack2: Tempated Object-Oriented Algebraic Preconditioner Package
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#ifndef IFPACK2_CHEBYSHEV_DECL_HPP
#define IFPACK2_CHEBYSHEV_DECL_HPP


#include "Ifpack2_ConfigDefs.hpp"
#include "Ifpack2_Preconditioner.hpp"
#include "Ifpack2_Condest.hpp"
#include "Ifpack2_Parameters.hpp"

#include <Tpetra_CrsMatrix.hpp>
#include <Tpetra_Vector.hpp>

#include <Teuchos_Assert.hpp>
#include <Teuchos_RCP.hpp>
#include <Teuchos_Time.hpp>
#include <Teuchos_TypeNameTraits.hpp>
#include <Teuchos_ScalarTraits.hpp>

#include <iostream>
#include <string>
#include <sstream>

namespace Teuchos {
  // forward declaration
  class ParameterList;
}

namespace Ifpack2 {


template<class MatrixType>
class Chebyshev : virtual public Ifpack2::Preconditioner<typename MatrixType::scalar_type,typename MatrixType::local_ordinal_type,typename MatrixType::global_ordinal_type,typename MatrixType::node_type> {

public:
  typedef typename MatrixType::scalar_type Scalar;
  typedef typename MatrixType::local_ordinal_type LocalOrdinal;
  typedef typename MatrixType::global_ordinal_type GlobalOrdinal;
  typedef typename MatrixType::node_type Node;
  typedef typename Teuchos::ScalarTraits<Scalar>::magnitudeType magnitudeType;

  // \name Constructors and Destructors

  explicit Chebyshev(const Teuchos::RCP<const Tpetra::RowMatrix<Scalar,LocalOrdinal,GlobalOrdinal,Node> >& A);

  virtual ~Chebyshev();




  void setParameters(const Teuchos::ParameterList& params);

  void initialize();

  inline bool isInitialized() const {
    return(IsInitialized_);
  }

  void compute();

  inline bool isComputed() const {
    return(IsComputed_);
  }





  void apply(const Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& X,
                   Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& Y,
                   Teuchos::ETransp mode = Teuchos::NO_TRANS,
                 Scalar alpha = Teuchos::ScalarTraits<Scalar>::one(),
                 Scalar beta = Teuchos::ScalarTraits<Scalar>::zero()) const;

  const Teuchos::RCP<const Tpetra::Map<LocalOrdinal,GlobalOrdinal,Node> >& getDomainMap() const;

  const Teuchos::RCP<const Tpetra::Map<LocalOrdinal,GlobalOrdinal,Node> >& getRangeMap() const;

  bool hasTransposeApply() const;


  void applyMat(const Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& X,
                      Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& Y,
                      Teuchos::ETransp mode = Teuchos::NO_TRANS) const;




  magnitudeType computeCondEst(CondestType CT = Cheap, 
                               LocalOrdinal MaxIters = 1550,
                               magnitudeType Tol = 1e-9,
                               const Teuchos::Ptr<const Tpetra::RowMatrix<Scalar,LocalOrdinal,GlobalOrdinal,Node> > &matrix = Teuchos::null);




  magnitudeType getCondEst() const;

  const Teuchos::RCP<const Teuchos::Comm<int> > & getComm() const;

  Teuchos::RCP<const Tpetra::RowMatrix<Scalar,LocalOrdinal,GlobalOrdinal,Node> > getMatrix() const;

  double getComputeFlops() const;

  double getApplyFlops() const;

  int getNumInitialize() const;

  int getNumCompute() const;

  int getNumApply() const;

  double getInitializeTime() const;

  double getComputeTime() const;

  double getApplyTime() const;




  std::string description() const;

  void describe(Teuchos::FancyOStream &out, const Teuchos::EVerbosityLevel verbLevel=Teuchos::Describable::verbLevel_default) const;


  // @{ \name Utility methods

  static void PowerMethod(const Tpetra::Operator<Scalar,LocalOrdinal,GlobalOrdinal,Node>& Operator,
                         const Tpetra::Vector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& InvPointDiagonal,
                         const int MaximumIterations, 
                         Scalar& LambdaMax);

  static void CG(const Tpetra::Operator<Scalar,LocalOrdinal,GlobalOrdinal,Node>& Operator, 
                const Tpetra::Vector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& InvPointDiagonal, 
                const int MaximumIterations, 
                Scalar& lambda_min, Scalar& lambda_max);


private:
  
  Chebyshev(const Chebyshev<MatrixType>& src);

  Chebyshev<MatrixType>& operator=(const Chebyshev<MatrixType>& src);

  // @{ Internal data and parameters

  const Teuchos::RCP<const Tpetra::RowMatrix<Scalar,LocalOrdinal,GlobalOrdinal,Node> > A_;
  const Teuchos::RCP<const Teuchos::Comm<int> > Comm_;
  mutable Teuchos::RCP<Tpetra::Vector<Scalar,LocalOrdinal,GlobalOrdinal,Node> > InvDiagonal_;
  Teuchos::RCP<Teuchos::Time> Time_;
  int PolyDegree_;
  magnitudeType EigRatio_;
  Scalar LambdaMin_;
  Scalar LambdaMax_;
  Scalar MinDiagonalValue_;
  bool ZeroStartingSolution_;
  magnitudeType Condest_;
  bool IsInitialized_;
  bool IsComputed_;
  int NumInitialize_;
  int NumCompute_;
  mutable int NumApply_;
  double InitializeTime_;
  double ComputeTime_;
  mutable double ApplyTime_;
  double ComputeFlops_;
  mutable double ApplyFlops_;
  size_t NumMyRows_;
  global_size_t NumGlobalRows_;
  global_size_t NumGlobalNonzeros_;


}; // class Chebyshev

}//namespace Ifpack2

#endif // IFPACK2_CHEBYSHEV_DECL_HPP