Ifpack_IHSS.h

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

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

#ifdef HAVE_IFPACK_EPETRAEXT
#include "Ifpack_Condest.h"
#include "Ifpack_ScalingType.h"
#include "Epetra_CompObject.h"
#include "Epetra_MultiVector.h"
#include "Epetra_Vector.h"
#include "Epetra_CrsGraph.h"
#include "Epetra_CrsMatrix.h"
#include "Epetra_BlockMap.h"
#include "Epetra_Map.h"
#include "Epetra_Object.h"
#include "Epetra_Comm.h"
#include "Epetra_CrsMatrix.h"
#include "Epetra_Time.h"
#include "Teuchos_RefCountPtr.hpp"


namespace Teuchos {
  class ParameterList;
}


class Ifpack_IHSS: public Ifpack_Preconditioner {

public:
  // @{ Constructors and destructors.

  Ifpack_IHSS(Epetra_RowMatrix* A);

  ~Ifpack_IHSS()
  {
    Destroy();
  }

  // @}
  // @{ Construction methods

  int Initialize();

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


  int Compute();

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

  /* This method is only available if the Teuchos package is enabled.
     This method recognizes four parameter names: relax_value,
     absolute_threshold, relative_threshold and overlap_mode. These names are
     case insensitive, and in each case except overlap_mode, the ParameterEntry
     must have type double. For overlap_mode, the ParameterEntry must have
     type Epetra_CombineMode.
  */
  int SetParameters(Teuchos::ParameterList& parameterlist);


  int SetUseTranspose(bool UseTranspose_in) {UseTranspose_ = UseTranspose_in; return(0);};
  // @}

  // @{ Mathematical functions.
  // Applies the matrix to X, returns the result in Y.
  int Apply(const Epetra_MultiVector& X,
               Epetra_MultiVector& Y) const
  {
    return(Multiply(false,X,Y));
  }

  int Multiply(bool Trans, const Epetra_MultiVector& X,
               Epetra_MultiVector& Y) const{return A_->Multiply(Trans,X,Y);}


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

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

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

  // @}
  // @{ Query methods

  const char* Label() const {return(Label_);}

  int SetLabel(const char* Label_in)
  {
    strcpy(Label_,Label_in);
    return(0);
  }

  double NormInf() const {return(0.0);};

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

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

  const Epetra_Map & OperatorDomainMap() const {return(A_->OperatorDomainMap());};

  const Epetra_Map & OperatorRangeMap() const{return(A_->OperatorRangeMap());};

  const Epetra_Comm & Comm() const{return(A_->Comm());};

  const Epetra_RowMatrix& Matrix() const
  {
    return(*A_);
  }

  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:

  // @}
  // @{ Private methods

  Ifpack_IHSS(const Ifpack_IHSS& RHS) :
    Time_(RHS.Comm())
  {}

  Ifpack_IHSS& operator=(const Ifpack_IHSS& /* RHS */)
  {
    return(*this);
  }

  void Destroy();


  int Solve(bool Trans, const Epetra_MultiVector& X, Epetra_MultiVector& Y) const;


#ifndef EPETRA_NO_32BIT_GLOBAL_INDICES
  int NumGlobalRows() const {return(A_->NumGlobalRows());};

  int NumGlobalCols() const {return(A_->NumGlobalCols());};
#endif
  long long NumGlobalRows64() const {return(A_->NumGlobalRows64());};
  long long NumGlobalCols64() const {return(A_->NumGlobalCols64());};

  int NumMyRows() const {return(A_->NumMyRows());};

  int NumMyCols() const {return(A_->NumMyCols());};

  int PowerMethod(Epetra_Operator * Op,const int MaximumIterations,  double& lambda_max);

  /*  Epetra_RowMatrix& Matrix()
  {
    return(*A_);
    }*/

  // @}
  // @{ Internal data

  Teuchos::RefCountPtr<Epetra_CrsMatrix> A_;
  Teuchos::RefCountPtr<Epetra_RowMatrix> Aherm_;
  Teuchos::RefCountPtr<Epetra_RowMatrix> Askew_;
  Teuchos::RefCountPtr<Ifpack_Preconditioner> Pherm_;
  Teuchos::RefCountPtr<Ifpack_Preconditioner> Pskew_;

  Teuchos::ParameterList List_;

  bool UseTranspose_;
  double Condest_;


  bool IsInitialized_;
  bool IsComputed_;
  char Label_[160];
  int NumInitialize_;
  int NumCompute_;

  int EigMaxIters_;
  double EigRatio_;
  double LambdaMax_;
  double Alpha_;
  int NumSweeps_;



  mutable int NumApplyInverse_;
  double InitializeTime_;
  double ComputeTime_;
  mutable double ApplyInverseTime_;
  double ComputeFlops_;
  mutable double ApplyInverseFlops_;
  mutable Epetra_Time Time_;

};
#else

#ifdef _MSC_VER
#pragma message("No EpetraEXT")
#else
#warning "No EpetraEXT"
#endif

#endif
#endif /* IFPACK_IHSS_H */