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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 MERIT_FUNC_CALC_1D_QUADRATIC_H
#define MERIT_FUNC_CALC_1D_QUADRATIC_H
#include "ConstrainedOptPack_MeritFuncCalc1D.hpp"
#include "ConstrainedOptPack_MeritFuncCalc.hpp"
namespace ConstrainedOptPack {
/** \brief Adds the ability to compute phi(alpha) at alpha of a given set of vectors.
*
* Computes <tt>phi( x = sum( alpha^k * d[k], k = 0...p-1 ) )</tt> where
* <tt>1 <= p <= 2</tt>.
*/
class MeritFuncCalc1DQuadratic : public MeritFuncCalc1D {
public:
/** \brief . */
typedef const Vector* const_VectorWithOp_ptr;
/** @name Constructors */
//@{
/** \brief The only constructor.
*
* Note that \c *x and \c *d gets updated as <tt>operator()(alpha)</tt> is called.
*
* The client must ensure that the memory pointed to by the vectors in d must not
* be desturbed while this object is in use. To do so may have bad side effects.
*
* @param phi [in] The merit function to use.
* @param p [in] The number of vectors in \c d[].
* @param d [in] Array (length \c p) of pointers to the rhs \c d[] vectors.
* @param x [out] The vector that gets updated.
*
* Preconditions:<ul>
* <li> <tt>1 <= p <= 3<tt>
* <li> <tt>d[k]->space().is_compatible(x->space()), for k = 0...p-1</tt>
* </ul>
*/
MeritFuncCalc1DQuadratic(
const MeritFuncCalc& phi
,size_type p
,const_VectorWithOp_ptr d[]
,VectorMutable* x
);
//@}
/** @name Overridden from MeritFuncCalc1D */
//@{
/// Returns <tt>phi( x = sum( alpha^k * d[k], k = 0...p-1 ) )</tt>.
value_type operator()(value_type alpha) const;
/// Returns phi.deriv()
value_type deriv() const;
/// Calls <tt>phi->print_merit_func()</tt>.
void print_merit_func(
std::ostream& out, const std::string& leading_str ) const;
//@}
private:
const MeritFuncCalc& phi_;
size_type p_;
const_VectorWithOp_ptr d_[3];
VectorMutable *x_;
// not defined and not to be called
MeritFuncCalc1DQuadratic();
MeritFuncCalc1DQuadratic& operator=( const MeritFuncCalc1DQuadratic& );
}; // end class MeritFuncCalc1DQuadratic
} // end namespace ConstrainedOptPack
#endif // MERIT_FUNC_CALC_1D_QUADRATIC_H
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