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// ***********************************************************************
//
// EpetraExt: Epetra Extended - Linear Algebra Services Package
// Copyright (2011) Sandia Corporation
//
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
//
// 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
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// Questions? Contact Michael A. Heroux (maherou@sandia.gov)
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//@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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