/*@HEADER
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//       Ifpack: Object-Oriented Algebraic Preconditioner Package
//                 Copyright (2002) Sandia Corporation
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#ifndef IFPACK_PERTURBEDMATRIX_H
#define IFPACK_PERTURBEDMATRIX_H

#include "Ifpack_ConfigDefs.h"
#include "Epetra_CrsGraph.h"
#include "Epetra_Object.h"
class Epetra_Comm;
class Epetra_Map;
//! Ifpack_PerturbedMatrix: Supports the use of diagonal perturbations in Ifpack.



class Ifpack_PerturbedMatrix: public Epetra_Object {

 public:
  //@{ \name Constructors/Destructor

  //! Constructor using Epetra_RowMatrix.
  /*! Creates an Ifpack_PerturbedMatrix object from the
	 Epetra_RowMatrix interface. 
    \param In
            RowMatrix - An object that has implemented the Epetra_RowMatrix interface.
  */
  Ifpack_PerturbedMatrix(const Epetra_RowMatrix & UserMatrix);
  
  //! Copy constructor.
  Ifpack_PerturbedMatrix(const Ifpack_PerturbedMatrix & Source);

  //! Ifpack_PerturbedMatrix Destructor
  virtual ~Ifpack_PerturbedMatrix();
  //@}

  //@{ \name Initialization methods.

  //! Set absolute threshold value
  void SetAbsoluteThreshold( double Athresh) {Athresh_ = Athresh; return;}

  //! Set relative threshold value
  void SetRelativeThreshold( double Rthresh) {Rthresh_ = Rthresh; return;}


  //@}
#endif // IFPACK_PERTURBEDMATRIX_H

#if defined(Ifpack_SHOW_DEPRECATED_WARNINGS)
#ifdef __GNUC__
#warning "The Ifpack package is deprecated"
#endif
#endif

