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// ***********************************************************************
//
// EpetraExt: Epetra Extended - Linear Algebra Services Package
// Copyright (2001) 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 EpetraExt_LINEARPROBLEM_SCALE_H
#define EpetraExt_LINEARPROBLEM_SCALE_H
#include <vector>
#include <EpetraExt_Transform.h>
class Epetra_LinearProblem;
class Epetra_Vector;
namespace EpetraExt {
///
/** Given an input Epetra_LinearProblem, recursive, left and right scaling are performed.
*/
class LinearProblem_Scale : public InPlaceTransform<Epetra_LinearProblem>
{
public:
enum ScaleType{ Sum, Max, Diag, None };
///
/** Destructor
*/
~LinearProblem_Scale();
///
/** Constructor
*/
LinearProblem_Scale( ScaleType left = Sum,
ScaleType right = Sum,
double exp_fac = 1.0,
int iterations = 1 )
: lScale_(left),
rScale_(right),
expFac_(exp_fac),
iters_(iterations),
scaled_(false)
{}
///
/** Applies forward scaling
*/
bool fwd();
///
/** Reverses scaling
*/
bool rvs();
private:
const ScaleType lScale_;
const ScaleType rScale_;
const double expFac_;
const int iters_;
bool scaled_;
std::vector<Epetra_Vector*> lScaleVecs_;
std::vector<Epetra_Vector*> rScaleVecs_;
};
} //namespace EpetraExt
#endif //EpetraExt_LINEARPROBLEM_SCALE_H
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