SqrtUpParameterTransformation.h

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// @(#)root/minuit2:$Id$
// Authors: M. Winkler, F. James, L. Moneta, A. Zsenei   2003-2005
 
/**********************************************************************
 *                                                                    *
 * Copyright (c) 2005 LCG ROOT Math team,  CERN/PH-SFT                *
 *                                                                    *
 **********************************************************************/
 
// Project   : LCG
// Package   : Minuit
// Author    : Lorenzo.MONETA@cern.ch
// Created by: moneta  at Thu Apr  8 10:26:22 2004
 
#ifndef ROOT_Minuit2_SqrtUpParameterTransformation
#define ROOT_Minuit2_SqrtUpParameterTransformation
 
namespace ROOT {
 
namespace Minuit2 {
 
class MnMachinePrecision;
 
/**
 * 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:
   // create with user defined precision
   SqrtUpParameterTransformation() {}
 
   ~SqrtUpParameterTransformation() {}
 
   // transformation from internal to external
   double Int2ext(double Value, double Upper) const;
 
   // transformation from external to internal
   double Ext2int(double Value, double Upper, const MnMachinePrecision &) const;
 
   // derivative of transformation from internal to external
   double DInt2Ext(double Value, double Upper) const;
 
private:
};
 
} // namespace Minuit2
 
} // namespace ROOT
 
#endif