CLHEP/GenericFunctions/Erf.hh

0001 // -*- C++ -*-
0002 // $Id: Erf.hh,v 1.2 2003/09/06 14:04:13 boudreau Exp $
0003 //---------------------Erf--------------------------------------------------//
0004 //                                                                          //
0005 // Class Erf                                                                //
0006 // Joe Boudreau, Petar Maksimovic, November 1999                            //
0007 //                                                                          //
0008 //--------------------------------------------------------------------------//
0009 #ifndef Erf_h
0010 #define Erf_h 1
0011 #include "CLHEP/GenericFunctions/AbsFunction.hh"
0012 #include "CLHEP/GenericFunctions/Parameter.hh"
0013 #include "CLHEP/GenericFunctions/IncompleteGamma.hh"
0014 namespace Genfun {
0015
0016   /**
0017    * @author
0018    * @ingroup genfun
0019    */
0020   class Erf : public AbsFunction  {
0021
0022     FUNCTION_OBJECT_DEF(Erf)
0023
0024       public:
0025
0026     // Constructor
0027     Erf();
0028
0029     // Copy constructor
0030     Erf(const Erf &right);
0031
0032     // Destructor
0033     virtual ~Erf();
0034
0035     // Retreive function value
0036     virtual double operator ()(double argument) const override;
0037     virtual double operator ()(const Argument & a) const override {return operator() (a[0]);}
0038
0039     // Derivative.
0040     Derivative partial (unsigned int) const override;
0041
0042     // Does this function have an analytic derivative?
0043     virtual bool hasAnalyticDerivative() const override {return true;}
0044
0045   private:
0046
0047     // It is illegal to assign an adjustable constant
0048     const Erf & operator=(const Erf &right);
0049
0050     IncompleteGamma _incompleteGamma;
0051
0052   };
0053 } // namespace Genfun
0054 #endif