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// ***********************************************************************
//
// Moocho: Multi-functional Object-Oriented arCHitecture for Optimization
// Copyright (2003) 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 Roscoe A. Bartlett (rabartl@sandia.gov)
//
// ***********************************************************************
// @HEADER
#ifndef NULL_SPACE_STEP_WITHOUT_BOUNDS_STEP_H
#define NULL_SPACE_STEP_WITHOUT_BOUNDS_STEP_H
#include "MoochoPack_Types.hpp"
#include "IterationPack_AlgorithmStep.hpp"
#include "Teuchos_StandardMemberCompositionMacros.hpp"
namespace MoochoPack {
/** \brief Solves the unconstrained QP subproblem: <tt>min qp_grad' * pz + (1/2) * pz' * rHL * pz</tt>.
*
* The solution to this system is just:<br>
* <tt>pz = inv(rHL) *qp_grad</tt>.
*
* If use_qp_correc is false then:<br>
* <tt>qp_grad = rGf</tt>
* else<br>
* <tt>qp_grad = rGf + zeta * ZtHLYpy.<br>
*
* Then <tt>Zpz = Z * pz</tt>
*/
class TangentialStepWithoutBounds_Step
: public IterationPack::AlgorithmStep // doxygen needs full path
{
public:
/** \brief Set the maximum size for ||pz|| dampening.
*
* A value of <tt>max_pz_norm <= 0.0</tt> means not to dampen pz!
*/
STANDARD_MEMBER_COMPOSITION_MEMBERS( value_type, max_pz_norm );
/** \brief Set the number of iterations to dampen pz for.
*
* A value of <tt>num_pz_damp_iters <= 0</tt> means not to dampen pz for any
* iterations!
*/
STANDARD_MEMBER_COMPOSITION_MEMBERS( int, num_pz_damp_iters );
/** \brief . */
TangentialStepWithoutBounds_Step();
/** @name Overridden from AlgorithmStep */
//@{
/** \brief . */
bool do_step(Algorithm& algo, poss_type step_poss, IterationPack::EDoStepType type
, poss_type assoc_step_poss);
/** \brief . */
void print_step( const Algorithm& algo, poss_type step_poss, IterationPack::EDoStepType type
, poss_type assoc_step_poss, std::ostream& out, const std::string& leading_str ) const;
//@}
}; // end class TangentialStepWithoutBounds_Step
} // end namespace MoochoPack
#endif // NULL_SPACE_STEP_WITHOUT_BOUNDS_STEP_H
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