Parameter.h

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// ************************************************************************** //
//
//  BornAgain: simulate and fit scattering at grazing incidence
//
//! @file      Fit/Kernel/Parameter.h
//! @brief     Defines class Parameter.
//!
//! @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_KERNEL_PARAMETER_H
#define BORNAGAIN_FIT_KERNEL_PARAMETER_H
 
#include "Fit/Tools/AttLimits.h"
#include <string>
 
namespace Fit
{
 
//! A fittable parameter with value, error, step, and limits.
//! @ingroup fitting
 
class Parameter
{
public:
    Parameter();
 
    //! Fit parameter constructor.
    //! @param name: unique name of fit parameters
    //! @param value: starting value of fit parameter
    //! @param limits: fit parameter limits
    //! @param step: initial step of fit parameter during the minimization,
    //! will be calculated automatically, if zero.
    Parameter(const std::string& name, double value,
              const AttLimits& limits = AttLimits::limitless(), double step = 0.0);
 
    std::string name() const;
 
    double startValue() const;
 
    AttLimits limits() const;
 
    double value() const;
    void setValue(double value);
 
    double step() const;
 
    double error() const;
    void setError(double value);
 
private:
    std::string m_name;   //!< unique fit parameter name
    double m_start_value; //!< starting value of fit parameters
    double m_value;       //!< current value of fit parameters
    double m_step;        //!< approximate initial step for the minimizer
    double m_error;       //!< error of fit parameter calculated by the minimizer
    AttLimits m_limits;
};
 
} // namespace Fit
 
#endif // BORNAGAIN_FIT_KERNEL_PARAMETER_H