SqrtLowParameterTransformation.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_SqrtLowParameterTransformation
#define ROOT_Minuit2_SqrtLowParameterTransformation
 
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 Lower Parameter limits
 */
 
class SqrtLowParameterTransformation /* : public ParameterTransformation */ {
 
public:
 
  SqrtLowParameterTransformation() {}
 
  ~SqrtLowParameterTransformation() {}
 
  // transformation from internal to external
  double Int2ext(double Value, double Lower) const;
 
  // transformation from external to internal
  double Ext2int(double Value, double Lower, const MnMachinePrecision&) const;
 
  // derivative of transformation from internal to external
  double DInt2Ext(double Value, double Lower) const;
 
private:
};
 
  }  // namespace Minuit2
 
}  // namespace ROOT
 
#endif