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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Fit/Residual/ResidualFunctionAdapter.h
//! @brief Defines class ResidualFunctionAdapter.
//!
//! @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)
//
// ************************************************************************************************
#ifdef SWIG
#error no need to expose this header to Swig
#endif // SWIG
#ifndef BORNAGAIN_FIT_RESIDUAL_RESIDUALFUNCTIONADAPTER_H
#define BORNAGAIN_FIT_RESIDUAL_RESIDUALFUNCTIONADAPTER_H
#include "Fit/Minimizer/Types.h"
#include "Fit/Param/Parameters.h"
#include "Fit/Residual/IFunctionAdapter.h"
#include <functional>
#include <memory>
#include <vector>
class RootResidualFunction;
namespace mumufit {
//! Provides RootResidualFunction which will be minimizer by ROOT.
//! Converts ROOT calls to the call of fcn_residual_t.
class ResidualFunctionAdapter : public IFunctionAdapter {
public:
ResidualFunctionAdapter(const fcn_residual_t& func, const Parameters& parameters);
const RootResidualFunction* rootResidualFunction();
private:
void calculate_gradients(const std::vector<double>& pars);
std::vector<double> get_residuals(const std::vector<double>& pars);
//! evaluate method for gradients and residuals called directly from the minimizer
double element_residual(const std::vector<double>& pars, unsigned int index,
std::vector<double>& gradients);
//! Evaluate chi2
double chi2(const std::vector<double>& pars);
//! Length of vector with residuals, should stay the same during minimization.
size_t m_datasize;
fcn_residual_t m_fcn; //!< user function to minimize
Parameters m_parameters;
std::vector<double> m_residuals;
double2d_t m_gradients; // [m_npars][m_ndatasize]
std::unique_ptr<RootResidualFunction> m_root_objective;
};
} // namespace mumufit
#endif // BORNAGAIN_FIT_RESIDUAL_RESIDUALFUNCTIONADAPTER_H
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