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// ***********************************************************************
//
// Thyra: Interfaces and Support for Abstract Numerical Algorithms
// Copyright (2004) 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 THYRA_DIAGONAL_LINEAR_OP_WITH_SOLVE_HPP
#define THYRA_DIAGONAL_LINEAR_OP_WITH_SOLVE_HPP
#include "Thyra_DefaultDiagonalLinearOpWithSolve_decl.hpp"
#include "Thyra_DefaultDiagonalLinearOp.hpp"
#include "Thyra_MultiVectorStdOps.hpp"
#include "Thyra_VectorBase.hpp"
#include "Thyra_TestingTools.hpp" // ToDo: I need to have a better way to get eps()!
#include "Teuchos_Assert.hpp"
namespace Thyra {
// Constructors/initializers/accessors
template<class Scalar>
DefaultDiagonalLinearOpWithSolve<Scalar>::DefaultDiagonalLinearOpWithSolve()
{}
template<class Scalar>
DefaultDiagonalLinearOpWithSolve<Scalar>::DefaultDiagonalLinearOpWithSolve(
const RCP<const VectorBase<Scalar> > &diag
)
{
initialize(diag);
}
// protected
// Overridden from LinearOpWithSolveBase
template<class Scalar>
bool
DefaultDiagonalLinearOpWithSolve<Scalar>::solveSupportsImpl(
EOpTransp M_trans) const
{
typedef Teuchos::ScalarTraits<Scalar> ST;
return (ST::isComplex ? M_trans==NOTRANS || M_trans==TRANS : true);
}
template<class Scalar>
bool
DefaultDiagonalLinearOpWithSolve<Scalar>::solveSupportsSolveMeasureTypeImpl(
EOpTransp M_trans, const SolveMeasureType& solveMeasureType) const
{
return this->solveSupportsImpl(M_trans); // I am a direct solver!
}
template<class Scalar>
SolveStatus<Scalar>
DefaultDiagonalLinearOpWithSolve<Scalar>::solveImpl(
const EOpTransp transp,
const MultiVectorBase<Scalar> &B,
const Ptr<MultiVectorBase<Scalar> > &X,
const Ptr<const SolveCriteria<Scalar> > solveCriteria
) const
{
#ifdef THYRA_DEBUG
TEUCHOS_ASSERT(this->solveSupportsImpl(transp));
#endif
typedef Teuchos::ScalarTraits<Scalar> ST;
assign(X, ST::zero());
const Ordinal numCols = B.domain()->dim();
SolveStatus<Scalar> overallSolveStatus;
for (Ordinal col_j = 0; col_j < numCols; ++col_j) {
const RCP<const VectorBase<Scalar> > b = B.col(col_j);
const RCP<VectorBase<Scalar> > x = X->col(col_j);
ele_wise_divide( ST::one(), *b, *this->getDiag(), x.ptr() );
}
SolveStatus<Scalar> solveStatus;
solveStatus.solveStatus =
(nonnull(solveCriteria) && !solveCriteria->solveMeasureType.useDefault()
? SOLVE_STATUS_CONVERGED : SOLVE_STATUS_UNKNOWN );
solveStatus.achievedTol = SolveStatus<Scalar>::unknownTolerance();
return solveStatus;
}
} // end namespace Thyra
#endif // THYRA_DIAGONAL_LINEAR_OP_WITH_SOLVE_HPP
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