libtrilinos-ifpack-dev 12.4.2-2 / usr / include / trilinos / Ifpack_RCMReordering.h

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/*@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.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions? Contact Michael A. Heroux (maherou@sandia.gov)
//
// ***********************************************************************
//@HEADER
*/

#ifndef IFPACK_RCMREORDERING_H
#define IFPACK_RCMREORDERING_H

#include "Ifpack_ConfigDefs.h"
#include "Ifpack_Reordering.h"

namespace Teuchos {
  class ParameterList;
}
class Ifpack_Graph;
class Epetra_MultiVector;
class Epetra_RowMatrix;

//! Ifpack_RCMReordering: reverse Cuthill-McKee reordering.

class Ifpack_RCMReordering : public Ifpack_Reordering {

public:

  //! Constructor for Ifpack_Graph's.
  Ifpack_RCMReordering();

  //! Copy Constructor.
  Ifpack_RCMReordering(const Ifpack_RCMReordering& RHS);

  //! Assignment operator.
  Ifpack_RCMReordering& operator=(const Ifpack_RCMReordering& RHS);

  //! Destructor.
  virtual ~Ifpack_RCMReordering() {};

  //! Sets integer parameters `Name'.
  virtual int SetParameter(const std::string Name, const int Value);

  //! Sets double parameters `Name'.
  virtual int SetParameter(const std::string Name, const double Value);

  //! Sets all parameters.
  virtual int SetParameters(Teuchos::ParameterList& List);

  //! Computes all it is necessary to initialize the reordering object.
  virtual int Compute(const Ifpack_Graph& Graph);

  //! Computes all it is necessary to initialize the reordering object.
  virtual int Compute(const Epetra_RowMatrix& Matrix);

  //! Returns \c true is the reordering object has been successfully initialized, false otherwise.
  virtual bool IsComputed() const
  {
    return(IsComputed_);
  }

  //! Returns the reordered index of row \c i.
  virtual int Reorder(const int i) const;

  //! Returns the inverse reordered index of row \c i.
  virtual int InvReorder(const int i) const;

  //! Applies reordering to multivector X, whose local length equals the number of local rows.
  virtual int P(const Epetra_MultiVector& Xorig,
                Epetra_MultiVector& Xreord) const;

  //! Applies inverse reordering to multivector X, whose local length equals the number of local rows.
  virtual int Pinv(const Epetra_MultiVector& Xorig,
                   Epetra_MultiVector& Xinvreord) const;


  //! Prints basic information on iostream. This function is used by operator<<.
  virtual std::ostream& Print(std::ostream& os) const;

  //! Returns the number of local rows.
  virtual int NumMyRows() const
  {
    return(NumMyRows_);
  }

  //! Returns the root node.
  virtual int RootNode() const
  {
    return(RootNode_);
  }

private:
  //! Defines the root node (defaulted to 0).
  int RootNode_;
  //! Number of local rows in the graph.
  int NumMyRows_;
  //! If \c true, the reordering has been successfully computed.
  bool IsComputed_;
  //! Contains the reordering.
  std::vector<int> Reorder_;
  //! Contains the inverse reordering.
  std::vector<int> InvReorder_;
};

#endif

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