Ifpack_IC.h

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

#include "Ifpack_ConfigDefs.h"
#include "Ifpack_CondestType.h"
#include "Ifpack_ScalingType.h"
#include "Ifpack_Preconditioner.h"
#include "Epetra_Vector.h"
#include "Epetra_CrsMatrix.h"
#include "Epetra_RowMatrix.h"
#include "Epetra_Time.h"
#include "Teuchos_RefCountPtr.hpp"

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


class Ifpack_IC: public Ifpack_Preconditioner {
      
 public:

  Ifpack_IC(Epetra_RowMatrix* A);
  
  virtual ~Ifpack_IC();

  void SetAbsoluteThreshold( double Athresh) {Athresh_ = Athresh; return;}

  void SetRelativeThreshold( double Rthresh) {Rthresh_ = Rthresh; return;}

  /* This method is only available if the Teuchos package is enabled.
     This method recognizes five parameter names: level_fill, drop_tolerance,
     absolute_threshold, relative_threshold and overlap_mode. These names are
     case insensitive. For level_fill the ParameterEntry must have type int, the 
     threshold entries must have type double and overlap_mode must have type
     Epetra_CombineMode.
  */
  int SetParameters(Teuchos::ParameterList& parameterlis);
  
  int SetParameter(const string Name, const int Value)
  {
    IFPACK_CHK_ERR(-98);
  }
  int SetParameter(const string Name, const double Value)
  {
    IFPACK_CHK_ERR(-98);
  }

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

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

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


  int Initialize();


  int Compute();
  int ComputeSetup();

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

  // Mathematical functions.
  

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

  int Apply(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_);
  }

  // Attribute access functions
  
  double GetAbsoluteThreshold() {return Athresh_;}

  double GetRelativeThreshold() {return Rthresh_;}
    
#ifndef EPETRA_NO_32BIT_GLOBAL_INDICES
  int NumGlobalNonzeros() const {return(U().NumGlobalNonzeros()+D().GlobalLength());};
#endif
  long long NumGlobalNonzeros64() const {return(U().NumGlobalNonzeros64()+D().GlobalLength64());};
 
  int NumMyNonzeros() const {return(U().NumMyNonzeros()+D().MyLength());};
  const Epetra_Vector & D() const {return(*D_);};
    
  const Epetra_CrsMatrix & U() const {return(*U_);};



  int SetUseTranspose(bool UseTranspose_in) {UseTranspose_ = UseTranspose_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(Comm_);};

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

    int SetLabel(const char* Label_in)
    {
      strcpy(Label_,Label_in);
      return(0);
    }
 
  virtual 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:
  
  double LevelOfFill() const
  {
    return(Lfil_);
  }

  double AbsoluteThreshold() const
  {
    return(Athresh_);
  }

  double RelativeThreshold() const
  {
    return(Rthresh_);
  }

  double DropTolerance() const
  {
    return(Droptol_);
  }

  Teuchos::RefCountPtr<Epetra_RowMatrix> A_;
  const Epetra_Comm & Comm_;
  Teuchos::RefCountPtr<Epetra_CrsMatrix> U_;
  Teuchos::RefCountPtr<Epetra_Vector> D_;
  bool UseTranspose_;

  double Condest_;
  double Athresh_;
  double Rthresh_;
  double Droptol_;
  double Lfil_;

  void * Aict_;
  void * Lict_;
  double * Ldiag_;
  char Label_[160];

  bool IsInitialized_;
  bool IsComputed_;
 
  int NumInitialize_;
  int NumCompute_;
  mutable int NumApplyInverse_;

  double InitializeTime_;
  double ComputeTime_;
  mutable double ApplyInverseTime_;
  mutable Epetra_Time Time_;

  double ComputeFlops_;
  mutable double ApplyInverseFlops_;

};

#endif /* IFPACK_IC_H */