Ifpack2_Diagonal_decl.hpp

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#ifndef IFPACK2_DIAGONAL_DECL_HPP
#define IFPACK2_DIAGONAL_DECL_HPP

#include <Ifpack2_Preconditioner.hpp>
#include <Ifpack2_Details_CanChangeMatrix.hpp>
#include <Tpetra_CrsMatrix_decl.hpp>

namespace Ifpack2 {

template<class MatrixType>
class Diagonal :
    virtual public Ifpack2::Preconditioner<typename MatrixType::scalar_type,
                                           typename MatrixType::local_ordinal_type,
                                           typename MatrixType::global_ordinal_type,
                                           typename MatrixType::node_type>,
    virtual public Ifpack2::Details::CanChangeMatrix<Tpetra::RowMatrix<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_type;
  typedef typename MatrixType::local_ordinal_type local_ordinal_type;
  typedef typename MatrixType::global_ordinal_type global_ordinal_type;
  typedef typename MatrixType::node_type node_type;
  typedef typename Teuchos::ScalarTraits<scalar_type>::magnitudeType magnitude_type;

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

  typedef Tpetra::RowMatrix<scalar_type,
                            local_ordinal_type,
                            global_ordinal_type,
                            node_type> row_matrix_type;
  typedef Tpetra::CrsMatrix<scalar_type,
                            local_ordinal_type,
                            global_ordinal_type,
                            node_type> crs_matrix_type;
  typedef Tpetra::Vector<scalar_type,
                         local_ordinal_type,
                         global_ordinal_type,
                         node_type> vector_type;
  typedef Tpetra::Map<local_ordinal_type,
                      global_ordinal_type,
                      node_type> map_type;

  Diagonal (const Teuchos::RCP<const row_matrix_type>& A);

  Diagonal (const Teuchos::RCP<const crs_matrix_type>& A_in);

  Diagonal (const Teuchos::RCP<const vector_type>& diag);

  virtual ~Diagonal ();


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

  void initialize ();

  bool isInitialized () const {
    return isInitialized_;
  }

  void compute ();

  bool isComputed () const {
    return isComputed_;
  }




  virtual void
  setMatrix (const Teuchos::RCP<const row_matrix_type>& A);




  void
  apply (const Tpetra::MultiVector<scalar_type,local_ordinal_type,global_ordinal_type,node_type>& X,
         Tpetra::MultiVector<scalar_type,local_ordinal_type,global_ordinal_type,node_type>& Y,
         Teuchos::ETransp mode = Teuchos::NO_TRANS,
         scalar_type alpha = Teuchos::ScalarTraits<scalar_type>::one(),
         scalar_type beta = Teuchos::ScalarTraits<scalar_type>::zero()) const;

  Teuchos::RCP<const map_type> getDomainMap () const;

  Teuchos::RCP<const map_type> getRangeMap () const;




  magnitude_type TEUCHOS_DEPRECATED
  computeCondEst (CondestType CT = Cheap,
                  local_ordinal_type MaxIters = 1550,
                  magnitude_type Tol = 1e-9,
                  const Teuchos::Ptr<const row_matrix_type>& matrix = Teuchos::null);




  magnitude_type TEUCHOS_DEPRECATED getCondEst() const {
    return condEst_;
  }

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

  Teuchos::RCP<const row_matrix_type> getMatrix () const {
    return matrix_;
  }

  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;

private:
  void reset ();

  Teuchos::RCP<const row_matrix_type> matrix_;

  Teuchos::RCP<const vector_type> userInverseDiag_;

  Teuchos::RCP<const vector_type> inverseDiag_;
  Teuchos::ArrayRCP<size_t> offsets_;

  double initializeTime_;
  double computeTime_;
  mutable double applyTime_;

  int numInitialize_;
  int numCompute_;
  mutable int numApply_;

  magnitude_type condEst_;
  bool isInitialized_;
  bool isComputed_;
};

template<class MatrixType, class VectorType>
Teuchos::RCP<Ifpack2::Diagonal<MatrixType> >
createDiagonalPreconditioner (const Teuchos::RCP<const VectorType>& invdiag)
{
  return Teuchos::rcp (new Ifpack2::Diagonal<MatrixType> (invdiag));
}

}//namespace Ifpack2

#endif