AsinhTransform1D.hh
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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_