SqrtLowParameterTransformation.h

Go to the documentation of this file.

// @(#)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