Ifpack_ILU.h

/*@HEADER
// ***********************************************************************
// 
//       Ifpack: Object-Oriented Algebraic Preconditioner Package
//                 Copyright (2002) Sandia Corporation
// 
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
// 
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
// License, or (at your option) any later version.
//  
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//  
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA
// Questions? Contact Michael A. Heroux (maherou@sandia.gov) 
// 
// ***********************************************************************
//@HEADER
*/

#ifndef IFPACK_ILU_H
#define IFPACK_ILU_H

#include "Ifpack_ConfigDefs.h"
#ifdef HAVE_IFPACK_TEUCHOS
#include "Ifpack_Preconditioner.h"
#include "Ifpack_Condest.h"
#include "Ifpack_ScalingType.h"
#include "Ifpack_IlukGraph.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_RowMatrix.h"
#include "Epetra_Time.h"

#ifdef HAVE_IFPACK_TEUCHOS
namespace Teuchos {
  class ParameterList;
  template<class T>
  class RefCountPtr;
}
#endif


class Ifpack_ILU: public Ifpack_Preconditioner {
      
public:
  // @{ Constructors and destructors.
  Ifpack_ILU(Epetra_RowMatrix* A);
  
  ~Ifpack_ILU()
  {
    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) {UseTranspose_ = UseTranspose; 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;


  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 = 0);

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

  // @}
  // @{ Query methods
  
  const Epetra_CrsMatrix & L() const {return(*L_);};
    
  const Epetra_Vector & D() const {return(*D_);};
    
  const Epetra_CrsMatrix & U() const {return(*U_);};

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

  int SetLabel(const char* Label)
  {
    strcpy(Label_,Label);
    return(0);
  }
  
  double NormInf() const {return(0.0);};

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

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

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

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

  const Epetra_Comm & Comm() const{return(Comm_);};

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

  virtual ostream& Print(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_ILU(const Ifpack_ILU& RHS) :
    Comm_(RHS.Comm()),
    Time_(RHS.Comm())
  {}

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

  void Destroy();


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

  int ComputeSetup();
  int InitAllValues(const Epetra_RowMatrix & A, int MaxNumEntries);

  int LevelOfFill() const {return LevelOfFill_;}

  double RelaxValue() const {return RelaxValue_;}

  double AbsoluteThreshold() const {return Athresh_;}

  double RelativeThreshold() const {return Rthresh_;}

  int NumGlobalRows() const {return(Graph().NumGlobalRows());};
  
  int NumGlobalCols() const {return(Graph().NumGlobalCols());};
  
  int NumGlobalNonzeros() const {return(L().NumGlobalNonzeros()+U().NumGlobalNonzeros());};
  
  virtual int NumGlobalBlockDiagonals() const {return(Graph().NumGlobalBlockDiagonals());};
  
  int NumMyRows() const {return(Graph().NumMyRows());};
  
  int NumMyCols() const {return(Graph().NumMyCols());};
  
  int NumMyNonzeros() const {return(L().NumMyNonzeros()+U().NumMyNonzeros());};
  
  virtual int NumMyBlockDiagonals() const {return(Graph().NumMyBlockDiagonals());};
  
  virtual int NumMyDiagonals() const {return(NumMyDiagonals_);};
  
  int IndexBase() const {return(Graph().IndexBase());};
  
  const Ifpack_IlukGraph & Graph() const {return(*Graph_);};
  
  Epetra_RowMatrix& Matrix()
  {
    return(*A_);
  }

  // @}
  // @{ Internal data
  
  Epetra_RowMatrix* A_;
  Teuchos::RefCountPtr<Ifpack_IlukGraph> Graph_;
  Teuchos::RefCountPtr<Epetra_CrsGraph> CrsGraph_;
  Teuchos::RefCountPtr<Epetra_Map> IlukRowMap_;
  Teuchos::RefCountPtr<Epetra_Map> IlukDomainMap_;
  Teuchos::RefCountPtr<Epetra_Map> IlukRangeMap_;
  const Epetra_Map * U_DomainMap_;
  const Epetra_Map * L_RangeMap_;
  const Epetra_Comm & Comm_;
  Teuchos::RefCountPtr<Epetra_CrsMatrix> L_;
  Teuchos::RefCountPtr<Epetra_CrsMatrix> U_;
  Teuchos::RefCountPtr<Epetra_CrsGraph> L_Graph_;
  Teuchos::RefCountPtr<Epetra_CrsGraph> U_Graph_;
  Teuchos::RefCountPtr<Epetra_Vector> D_;
  bool UseTranspose_;

  int NumMyDiagonals_;
  bool Allocated_;
  bool ValuesInitialized_;
  bool Factored_;
  double RelaxValue_;
  double Athresh_;
  double Rthresh_;
  double Condest_;
  int LevelOfFill_;
  bool IsInitialized_;
  bool IsComputed_;
  char Label_[160];
  int NumInitialize_;
  int NumCompute_;
  mutable int NumApplyInverse_;
  double InitializeTime_;
  double ComputeTime_;
  mutable double ApplyInverseTime_;
  double ComputeFlops_;
  mutable double ApplyInverseFlops_;
  mutable Epetra_Time Time_;

};

#endif // HAVE_IFPACK_TEUCHOS
#endif /* IFPACK_ILU_H */

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