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// NOX: An Object-Oriented Nonlinear Solver Package
// Copyright (2002) Sandia Corporation
//
// LOCA: Library of Continuation Algorithms Package
// Copyright (2005) 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 Roger Pawlowski (rppawlo@sandia.gov) or
// Eric Phipps (etphipp@sandia.gov), Sandia National Laboratories.
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#ifndef LOCA_HOMOTOPY_ABSTRACTGROUP_H
#define LOCA_HOMOTOPY_ABSTRACTGROUP_H
#include "LOCA_MultiContinuation_AbstractGroup.H" // base class
namespace LOCA {
namespace Homotopy {
/*!
* \brief Interface to underlying groups for homotopy calculations
*/
/*!
* This abstract class provides an interface for a homotopy technique
* for solving nonlinear equations. See LOCA::Homotopy::Group for a
* description of the technique used. This class provides a single
* pure virtual method, augmentJacobianForHomotopy(), which scales the
* diagonal of the Jacobian by a constant times the identity matrix.
*/
class AbstractGroup :
public virtual LOCA::MultiContinuation::AbstractGroup {
public:
//! Default constructor.
AbstractGroup() {}
//! Destructor
virtual ~AbstractGroup() {}
/*!
* @name Pure virtual methods
* These methods must be defined by any concrete implementation
*/
//@{
/*!
* \brief Replace Jacobian \f$J\f$ by \f$aJ+bI\f$ where \f$I\f$ is
* the identity matrix
*/
virtual NOX::Abstract::Group::ReturnType
augmentJacobianForHomotopy(double a, double b) = 0;
//@}
//! Bring NOX::Abstract::Group::operator=() into scope
using NOX::Abstract::Group::operator=;
};
} // namespace Homotopy
} // namespace LOCA
#endif
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