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// ***********************************************************************
//
// 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
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//
// 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
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// Questions? Contact Michael A. Heroux (maherou@sandia.gov)
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//@HEADER
*/
#ifndef IFPACK_AMDREORDERING_H
#define IFPACK_AMDREORDERING_H
#include "Ifpack_ConfigDefs.h"
#include "Ifpack_Reordering.h"
namespace Teuchos {
class ParameterList;
}
class Ifpack_Graph;
class Epetra_MultiVector;
class Epetra_RowMatrix;
//! Ifpack_AMDReordering: approximate minimum degree reordering.
class Ifpack_AMDReordering : public Ifpack_Reordering {
public:
//! Constructor for Ifpack_Graph's.
Ifpack_AMDReordering();
//! Copy Constructor.
Ifpack_AMDReordering(const Ifpack_AMDReordering& RHS);
//! Assignment operator.
Ifpack_AMDReordering& operator=(const Ifpack_AMDReordering& RHS);
//! Destructor.
virtual ~Ifpack_AMDReordering() {};
//! Sets integer parameters `Name'.
int SetParameter(const std::string Name, const int Value);
//! Sets double parameters `Name'.
int SetParameter(const std::string Name, const double Value);
//! Sets all parameters.
int SetParameters(Teuchos::ParameterList& List);
//! Computes all it is necessary to initialize the reordering object.
int Compute(const Ifpack_Graph& Graph);
//! Computes all it is necessary to initialize the reordering object.
int Compute(const Epetra_RowMatrix& Matrix);
//! Returns \c true is the reordering object has been successfully initialized, false otherwise.
bool IsComputed() const
{
return(IsComputed_);
}
//! Returns the reordered index of row \c i.
inline int Reorder(const int i) const;
//! Returns the inverse reordered index of row \c i.
inline int InvReorder(const int i) const;
//! Applies reordering to multivector X, whose local length equals the number of local rows.
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.
int Pinv(const Epetra_MultiVector& Xorig,
Epetra_MultiVector& Xinvreord) const;
//! Prints basic information on iostream. This function is used by operator<<.
std::ostream& Print(std::ostream& os) const;
//! Returns the number of local rows.
int NumMyRows() const
{
return(NumMyRows_);
}
private:
//! 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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