AsinhTransform1D.hh

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#ifndef NPSTAT_ASINHTRANSFORM1D_HH_
#define NPSTAT_ASINHTRANSFORM1D_HH_
 
/*!
// \file AsinhTransform1D.hh
//
// \brief Asinh 1-d coordinate transform, as in Johnson's S_U curve
//
// Author: I. Volobouev
//
// April 2015
*/
 
#include "npstat/stat/AbsDistributionTransform1D.hh"
 
namespace npstat {
    class AsinhTransform1D : public AbsDistributionTransform1D
    {
    public:
        AsinhTransform1D(double delta, double lambda, double gamma, double xi);
        inline virtual ~AsinhTransform1D() {}
 
        inline virtual AsinhTransform1D* clone() const
            {return new AsinhTransform1D(*this);}
 
        double transformForward(double x, double* dydx) const;
        double transformBack(double y) const;
        inline bool isIncreasing() const {return true;}
 
        //@{
        /** Prototype needed for I/O */
        inline virtual gs::ClassId classId() const {return gs::ClassId(*this);}
        virtual bool write(std::ostream&) const;
        //@}
 
        static inline const char* classname()
            {return "npstat::AsinhTransform1D";}
        static inline unsigned version() {return 1;}
        static AsinhTransform1D* read(const gs::ClassId& id, std::istream& is);
 
    protected:
        virtual bool isEqual(const AbsDistributionTransform1D&) const;
 
    private:
        inline void setParameterChecked(const unsigned which, const double value)
            {params_[which] = value;}
        inline void setAllParametersChecked(const double* p)
            {for (unsigned i=0; i<4U; ++i) {params_[i] = p[i];}}
        inline double getParameterChecked(const unsigned which) const
            {return params_[which];}
 
        double params_[4];
    };
}
 
#endif // NPSTAT_ASINHTRANSFORM1D_HH_