MnParameterTransformation.h

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// @(#)root/minuit2:$Id$
// Authors: M. Winkler, F. James, L. Moneta, A. Zsenei, E.G.P. Bos   2003-2017
 
/**********************************************************************
 *                                                                    *
 * Copyright (c) 2005 LCG ROOT Math team,  CERN/PH-SFT                *
 *                                                                    *
 **********************************************************************/
 
#ifndef ROOT_Minuit2_SinParameterTransformation
#define ROOT_Minuit2_SinParameterTransformation
 
namespace ROOT {
 
namespace Minuit2 {
 
class MnMachinePrecision;
 
/**
   class for the transformation for double-limited parameter
   Using a sin function one goes from a double-limited parameter range to
   an unlimited one
 */
class SinParameterTransformation {
public:
   long double Int2ext(long double Value, long double Upper, long double Lower) const;
   long double Ext2int(long double Value, long double Upper, long double Lower, const MnMachinePrecision &) const;
   long double DInt2Ext(long double Value, long double Upper, long double Lower) const;
   long double DExt2Int(long double Value, long double Upper, long double Lower) const;
};
 
/**
 * Transformation from external to internal Parameter based on  sqrt(1 + x**2)
 *
 * This transformation applies for the case of single side Lower Parameter limits
 */
 
class SqrtLowParameterTransformation /* : public ParameterTransformation */ {
public:
   // transformation from internal to external
   long double Int2ext(long double Value, long double Lower) const;
 
   // transformation from external to internal
   long double Ext2int(long double Value, long double Lower, const MnMachinePrecision &) const;
 
   // derivative of transformation from internal to external
   long double DInt2Ext(long double Value, long double Lower) const;
 
   // derivative of transformation from external to internal
   long double DExt2Int(long double Value, long double Lower) const;
};
 
/**
 * Transformation from external to internal Parameter based on  sqrt(1 + x**2)
 *
 * This transformation applies for the case of single side Upper Parameter limits
 */
 
class SqrtUpParameterTransformation /* : public ParameterTransformation */ {
public:
   // transformation from internal to external
   long double Int2ext(long double Value, long double Upper) const;
 
   // transformation from external to internal
   long double Ext2int(long double Value, long double Upper, const MnMachinePrecision &) const;
 
   // derivative of transformation from internal to external
   long double DInt2Ext(long double Value, long double Upper) const;
 
   // derivative of transformation from external to internal
   long double DExt2Int(long double Value, long double Upper) const;
};
 
} // namespace Minuit2
 
} // namespace ROOT
 
#endif // ROOT_Minuit2_SinParameterTransformation