DoubleCrystalBall.h

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class TF1;
 
namespace DAS::DoubleCrystalBall {
 
struct Base {
 
    double N, 
           mu, 
           sigma, 
           kL, 
           nL, 
           kR, 
           nR; 
 
    double AL, 
           AR, 
           BL, 
           BR; 
 
    double z, 
           aR, 
           aL; 
 
    double expaR2, 
           expaL2; 
 
    double CR, 
           CL, 
           DD, 
           K;  
 
    double result; 
 
    inline double Z (double x)
    {
        return (x-mu)/sigma;
    }
 
    void SetParameters (double * p);
 
    virtual void Eval (double * x) = 0;
 
    double operator() (double * x, double *p);
 
    Base (TF1 * f = nullptr);
 
    void dump ();
 
    virtual ~Base () = default;
};
 
struct Distribution : public Base {
    void Eval (double * x) final;
};
 
struct Integral : public Base {
    void Eval (double * x) final;
};
 
struct DLog : public Base {
    void Eval (double * x) final;
};
 
} // end of DAS::DoubleCrystalBall namespace