Ifpack_ILUT.h

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//       Ifpack: Object-Oriented Algebraic Preconditioner Package
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#ifndef IFPACK_ILUT_H
#define IFPACK_ILUT_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_Time.h"
#include "Teuchos_RefCountPtr.hpp"

class Epetra_RowMatrix;
class Epetra_SerialComm;
class Epetra_Comm;
class Epetra_Map;
class Epetra_MultiVector;

namespace Teuchos {
  class ParameterList;
}


class Ifpack_ILUT: public Ifpack_Preconditioner {
      
public:
  // @{ Constructors and Destructors
  Ifpack_ILUT(const Epetra_RowMatrix* A);
  
  virtual ~Ifpack_ILUT();

  // @}
  // @{ Construction methods
  /* 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 Initialize();

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


  int Compute();

  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_);
  }


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

  const Epetra_CrsMatrix & L() const {return(*L_);};
  
  const Epetra_CrsMatrix & U() const {return(*U_);};
    
  const char* Label() const
  {
    return(Label_.c_str());
  }

  int SetLabel(const char* Label_in)
  {
    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_);
  }

  inline double LevelOfFill() const {
    return(LevelOfFill_);
  }

  inline double RelaxValue() const {
    return(Relax_);
  }

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

  inline double RelativeThreshold() const
  {
    return(Rthresh_);
  }
    
  inline double DropTolerance() const
  {
    return(DropTolerance_);
  }
    
#ifndef EPETRA_NO_32BIT_GLOBAL_INDICES
  int NumGlobalNonzeros() const {
    // FIXME: diagonal of L_ should not be stored
    return(L().NumGlobalNonzeros() + U().NumGlobalNonzeros() - L().NumGlobalRows());
  }
#endif
  long long NumGlobalNonzeros64() const {
    // FIXME: diagonal of L_ should not be stored
    return(L().NumGlobalNonzeros64() + U().NumGlobalNonzeros64() - L().NumGlobalRows64());
  }

  int NumMyNonzeros() const {
    return(L().NumMyNonzeros() + U().NumMyNonzeros());
  }

private:
  
  // @}
  // @{ Internal methods

  Ifpack_ILUT(const Ifpack_ILUT& RHS) :
    A_(RHS.Matrix()),
    Comm_(RHS.Comm()),
    Time_(Comm())
  {};

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

  template<typename int_type>
  int TCompute();

  void Destroy();

  // @}
  // @{ Internal data

  const Epetra_RowMatrix& A_;
  const Epetra_Comm& Comm_;
  Teuchos::RefCountPtr<Epetra_CrsMatrix> L_;
  Teuchos::RefCountPtr<Epetra_CrsMatrix> U_;
  double Condest_;
  double Relax_;
  double Athresh_;
  double Rthresh_;
  double LevelOfFill_;
  double DropTolerance_;
  string Label_;
  bool IsInitialized_;
  bool IsComputed_;
  bool UseTranspose_;
  int NumMyRows_;
  int NumInitialize_;
  int NumCompute_;
  mutable int NumApplyInverse_;
  double InitializeTime_;
  double ComputeTime_;
  mutable double ApplyInverseTime_;
  double ComputeFlops_;
  mutable double ApplyInverseFlops_;
  mutable Epetra_Time Time_;
  long long GlobalNonzeros_;
  Teuchos::RefCountPtr<Epetra_SerialComm> SerialComm_;
  Teuchos::RefCountPtr<Epetra_Map> SerialMap_;
}; // Ifpack_ILUT

#endif /* IFPACK_ILUT_H */