Ifpack_PointRelaxation.h

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//       Ifpack: Object-Oriented Algebraic Preconditioner Package
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#ifndef IFPACK_POINTRELAXATION_H
#define IFPACK_POINTRELAXATION_H

#include "Ifpack_ConfigDefs.h"
#include "Ifpack_Preconditioner.h"

#include "Epetra_Vector.h"
#include "Epetra_Time.h"
#include "Epetra_RowMatrix.h"
#include "Epetra_Import.h"

#include "Teuchos_RefCountPtr.hpp"

namespace Teuchos {
  class ParameterList;
}
class Epetra_MultiVector;
class Epetra_Vector;
class Epetra_Map;
class Epetra_Comm;
class Epetra_CrsMatrix;


class Ifpack_PointRelaxation : public Ifpack_Preconditioner {

public:


  Ifpack_PointRelaxation(const Epetra_RowMatrix* Matrix);

  virtual ~Ifpack_PointRelaxation() {}


  virtual inline int SetUseTranspose(bool UseTranspose_in)
  {
    UseTranspose_ = UseTranspose_in;
    return(0);
  }




  virtual inline int Apply(const Epetra_MultiVector& X, Epetra_MultiVector& Y) const
  {
    if (IsComputed() == false)
      IFPACK_CHK_ERR(-3);

    if (X.NumVectors() != Y.NumVectors())
      IFPACK_CHK_ERR(-2);

    IFPACK_CHK_ERR(Matrix_->Multiply(UseTranspose(),X,Y));
    return(0);
  }


  virtual int ApplyInverse(const Epetra_MultiVector& X, Epetra_MultiVector& Y) const;

  virtual double NormInf() const
  {
    return(-1.0);
  }


  virtual const char * Label() const
  {
    return(Label_.c_str());
  }

  virtual bool UseTranspose() const
  {
    return(UseTranspose_);
  }

  virtual bool HasNormInf() const
  {
    return(false);
  }

  virtual const Epetra_Comm & Comm() const;

  virtual const Epetra_Map & OperatorDomainMap() const;

  virtual const Epetra_Map & OperatorRangeMap() const;

  virtual int Initialize();

  virtual bool IsInitialized() const
  {
    return(IsInitialized_);
  }

  virtual inline bool IsComputed() const
  {
    return(IsComputed_);
  }

  virtual int Compute();



  virtual const Epetra_RowMatrix& Matrix() const
  {
    return(*Matrix_);
  }

  virtual double Condest(const Ifpack_CondestType CT = Ifpack_Cheap,
                         const int MaxIters = 1550,
                         const double Tol = 1e-9,
                         Epetra_RowMatrix* Matrix = 0);

  virtual double Condest() const
  {
    return(Condest_);
  }

  virtual int SetParameters(Teuchos::ParameterList& List);

  virtual std::ostream& Print(std::ostream & os) const;



  virtual int NumInitialize() const
  {
    return(NumInitialize_);
  }

  virtual int NumCompute() const
  {
    return(NumCompute_);
  }

  virtual int NumApplyInverse() const
  {
    return(NumApplyInverse_);
  }

  virtual double InitializeTime() const
  {
    return(InitializeTime_);
  }

  virtual double ComputeTime() const
  {
    return(ComputeTime_);
  }

  virtual double ApplyInverseTime() const
  {
    return(ApplyInverseTime_);
  }

  virtual double InitializeFlops() const
  {
    return(0.0);
  }

  virtual double ComputeFlops() const
  {
    return(ComputeFlops_);
  }

  virtual double ApplyInverseFlops() const
  {
    return(ApplyInverseFlops_);
  }

  // @}

private:

  // @{ Application of the preconditioner

  virtual int ApplyInverseJacobi(const Epetra_MultiVector& X,
                                 Epetra_MultiVector& Y) const;

  virtual int ApplyInverseGS(const Epetra_MultiVector& X,
                              Epetra_MultiVector& Y) const;

  virtual int ApplyInverseGS_RowMatrix(const Epetra_MultiVector& X,
                                        Epetra_MultiVector& Y) const;

  virtual int ApplyInverseGS_CrsMatrix(const Epetra_CrsMatrix* A,
                                        const Epetra_MultiVector& X,
                                        Epetra_MultiVector& Y) const;

  virtual int ApplyInverseGS_FastCrsMatrix(const Epetra_CrsMatrix* A,
                                            const Epetra_MultiVector& X,
                                            Epetra_MultiVector& Y) const;
  virtual int ApplyInverseGS_LocalFastCrsMatrix(const Epetra_CrsMatrix* A,
                                            const Epetra_MultiVector& X,
                                            Epetra_MultiVector& Y) const;

  virtual int ApplyInverseSGS(const Epetra_MultiVector& X,
                              Epetra_MultiVector& Y) const;

  virtual int ApplyInverseSGS_RowMatrix(const Epetra_MultiVector& X,
                                        Epetra_MultiVector& Y) const;

  virtual int ApplyInverseSGS_CrsMatrix(const Epetra_CrsMatrix* A,
                                        const Epetra_MultiVector& X,
                                        Epetra_MultiVector& Y) const;

  virtual int ApplyInverseSGS_FastCrsMatrix(const Epetra_CrsMatrix* A,
                                            const Epetra_MultiVector& X,
                                            Epetra_MultiVector& Y) const;

  virtual int ApplyInverseSGS_LocalFastCrsMatrix(const Epetra_CrsMatrix* A,
                                            const Epetra_MultiVector& X,
                                            Epetra_MultiVector& Y) const;



private:

  virtual void SetLabel();

  Ifpack_PointRelaxation(const Ifpack_PointRelaxation& /* rhs */)
  {}

  Ifpack_PointRelaxation& operator=(const Ifpack_PointRelaxation& /* rhs */)
  {
    return(*this);
  }

  // @{ Initializations, timing and flops
  bool IsInitialized_;
  bool IsComputed_;
  int NumInitialize_;
  int NumCompute_;
  mutable int NumApplyInverse_;
  double InitializeTime_;
  double ComputeTime_;
  mutable double ApplyInverseTime_;
  double ComputeFlops_;
  mutable double ApplyInverseFlops_;
  // @}

  // @{ Settings
  int NumSweeps_;
  double DampingFactor_;
  bool UseTranspose_;
  double Condest_;
#if 0
  // Unused; commented out to avoid build warnings

  bool ComputeCondest_;
#endif // 0
  std::string Label_;
  int PrecType_;
  double MinDiagonalValue_;
  // @}

  // @{ Other data
  int NumMyRows_;
  int NumMyNonzeros_;
  long long NumGlobalRows_;
  long long NumGlobalNonzeros_;
  Teuchos::RefCountPtr<const Epetra_RowMatrix> Matrix_;
  Teuchos::RefCountPtr<Epetra_Import> Importer_;
  mutable Teuchos::RefCountPtr<Epetra_Vector> Diagonal_;
  Teuchos::RefCountPtr<Epetra_Time> Time_;
  bool IsParallel_;
  bool ZeroStartingSolution_;
  bool DoBackwardGS_;
  bool DoL1Method_;
  double L1Eta_;

  int NumLocalSmoothingIndices_;
  int * LocalSmoothingIndices_;

  // @}



};

#endif // IFPACK_POINTRELAXATION_H