GSLLevenbergMarquardtMinimizer.h

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// ************************************************************************** //
//
//  BornAgain: simulate and fit scattering at grazing incidence
//
//! @file      Fit/RootAdapter/GSLLevenbergMarquardtMinimizer.h
//! @brief     Declares class GSLLevenbergMarquardtMinimizer.
//!
//! @homepage  http://www.bornagainproject.org
//! @license   GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2018
//! @authors   Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
// ************************************************************************** //
 
#ifndef BORNAGAIN_FIT_ROOTADAPTER_GSLLEVENBERGMARQUARDTMINIMIZER_H
#define BORNAGAIN_FIT_ROOTADAPTER_GSLLEVENBERGMARQUARDTMINIMIZER_H
 
#include "Fit/RootAdapter/RootMinimizerAdapter.h"
 
namespace ROOT
{
namespace Math
{
class GSLNLSMinimizer;
}
} // namespace ROOT
 
//! It's a facade to ROOT::Math::GSLNLSMinimizer which, in turn, is a facade to the
//! actual GSL's gsl_multifit_fdfsolver_type
//! (http://www.gnu.org/software/gsl/manual/html_node/Nonlinear-Least_002dSquares-Fitting.html).
//! @ingroup fitting_internal
 
class GSLLevenbergMarquardtMinimizer : public RootMinimizerAdapter
{
public:
    GSLLevenbergMarquardtMinimizer();
    ~GSLLevenbergMarquardtMinimizer() override;
 
    //! Sets tolerance on the function value at the minimum.
    void setTolerance(double value);
    double tolerance() const;
 
    //! Sets minimizer internal print level.
    void setPrintLevel(int value);
    int printLevel() const;
 
    //! Sets maximum number of iterations. This is an internal minimizer setting which has
    //! no direct relation to the number of objective function calls (e.g. numberOfIteraction=5
    //! might correspond to ~100 objective function calls).
    void setMaxIterations(int value);
    int maxIterations() const;
 
    std::string statusToString() const override;
    std::map<std::string, std::string> statusMap() const override;
 
    bool requiresResiduals() override { return true; }
 
protected:
    void propagateOptions() override;
    const root_minimizer_t* rootMinimizer() const override;
    void setParameter(unsigned int index, const Fit::Parameter& par) override;
 
private:
    std::unique_ptr<ROOT::Math::GSLNLSMinimizer> m_gsl_minimizer;
};
 
#endif // BORNAGAIN_FIT_ROOTADAPTER_GSLLEVENBERGMARQUARDTMINIMIZER_H