/usr/include/trilinos/OptiPack_DefaultPolyLineSearchPointEvaluator.hpp is in libtrilinos-optipack-dev 12.4.2-2.
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//
// OptiPack: Collection of simple Thyra-based Optimization ANAs
// Copyright (2009) Sandia Corporation
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#ifndef OPTIPACK_DEFAULT_POLY_LINE_SEARCH_POINT_EVALUATOR_HPP
#define OPTIPACK_DEFAULT_POLY_LINE_SEARCH_POINT_EVALUATOR_HPP
#include "OptiPack_LineSearchPointEvaluatorBase.hpp"
#include "Thyra_VectorStdOps.hpp"
namespace OptiPack {
/** \brief Default line search point evaluator using a polynomial linear
* combination of vectors.
*
* This object computes:
\verbatim
p = sum( alpha^i * vec[i], i = 0...n-1 )
\endverbatim
* This allows, for instance, a curvy-linear line search algorithm.
*/
template<typename Scalar>
class DefaultPolyLineSearchPointEvaluator : public LineSearchPointEvaluatorBase<Scalar>
{
public:
/** \brief . */
typedef typename ScalarTraits<Scalar>::magnitudeType ScalarMag;
/** \name Constructors/intializers/accessors. */
//@{
/** \brief . */
DefaultPolyLineSearchPointEvaluator();
/** \brief . */
void initialize(const ArrayView<const RCP<const Thyra::VectorBase<Scalar> > > &vecs);
//@}
/** \name Overridden from LineSearchPointEvaluatorBase. */
//@{
/** \brief . */
virtual void computePoint( const ScalarMag &alpha,
const Ptr<Thyra::VectorBase<Scalar> > &p
) const;
//@}
private:
Array<RCP<const Thyra::VectorBase<Scalar> > > vecs_;
};
/** \brief Nonmember constructor.
*
* \relates DefaultPolyLineSearchPointEvaluator
*/
template<typename Scalar>
const RCP<DefaultPolyLineSearchPointEvaluator<Scalar> >
defaultPolyLineSearchPointEvaluator()
{
return Teuchos::rcp(new DefaultPolyLineSearchPointEvaluator<Scalar>);
}
//
// Implementations
//
// Constructors/intializers/accessors
template<typename Scalar>
DefaultPolyLineSearchPointEvaluator<Scalar>::DefaultPolyLineSearchPointEvaluator()
{}
template<typename Scalar>
void DefaultPolyLineSearchPointEvaluator<Scalar>::initialize(
const ArrayView<const RCP<const Thyra::VectorBase<Scalar> > > &vecs
)
{
#ifdef TEUCHOS_DEBUG
TEUCHOS_ASSERT(vecs.size());
#endif
vecs_ = vecs;
}
// Overridden from LineSearchPointEvaluatorBase
template<typename Scalar>
void DefaultPolyLineSearchPointEvaluator<Scalar>::computePoint( const ScalarMag &alpha,
const Ptr<Thyra::VectorBase<Scalar> > &p
) const
{
typedef ScalarTraits<Scalar> ST;
using Teuchos::as;
using Thyra::V_V;
using Thyra::Vp_StV;
V_V( p, *vecs_[0] );
if (alpha != ST::zero()) {
ScalarMag alpha_i = alpha;
const int n = vecs_.size();
for (int i = 1; i < n; ++i, alpha_i *= alpha) {
Vp_StV(p, alpha_i, *vecs_[i]);
}
}
}
} // namespace OptiPack
#endif // OPTIPACK_DEFAULT_POLY_LINE_SEARCH_POINT_EVALUATOR_HPP
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