AsinhChiSquareComparator.h

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/*
 * ASinhChiSquareComparator.h
 *
 *  Created on: 2019 M04 30
 *      Author: mschefer
 */
 
#ifndef _MODELFITTING_ENGINE_ASINHCHISQUARECOMPARATOR_H_
#define _MODELFITTING_ENGINE_ASINHCHISQUARECOMPARATOR_H_
 
#include <cstdlib>
#include <cmath>
 
namespace ModelFitting {

class AsinhChiSquareComparator {
 
public:
 
  AsinhChiSquareComparator(double u0=10) : m_u0{u0} { }

  double operator()(double real, double model, double weight) const {
    float val =  weight * (real - model) / m_u0;
    return m_u0 * std::asinh(val);
  }
 
private:
 
  double m_u0;
 
}; // end of class AsinhChiSquareComparator
 
} // end of namespace ModelFitting
 
#endif /* _MODELFITTING_ENGINE_ASINHCHISQUARECOMPARATOR_H_ */