/usr/include/CLHEP/GenericFunctions/FunctionNumDeriv.hh is in libclhep-dev 2.1.4.1-1.2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | // -*- C++ -*-
// $Id: FunctionNumDeriv.hh,v 1.2 2003/09/06 14:04:13 boudreau Exp $
//--------------------------FunctionNumDeriv--------------------------------//
// //
// Class FunctionNumDeriv, providing numerical derivatives //
// Joe Boudreau, Mark Fischler, February 2001 //
// //
//--------------------------------------------------------------------------//
#ifndef FunctionNumDeriv_h
#define FunctionNumDeriv_h 1
#include "CLHEP/GenericFunctions/AbsFunction.hh"
namespace Genfun {
/**
* @author
* @ingroup genfun
*/
class FunctionNumDeriv : public AbsFunction {
FUNCTION_OBJECT_DEF(FunctionNumDeriv)
public:
// Constructor
FunctionNumDeriv(const AbsFunction *arg1, unsigned int index=0);
// Copy constructor.
FunctionNumDeriv(const FunctionNumDeriv &right);
// Destructor
virtual ~FunctionNumDeriv();
// Retreive function value
virtual double operator ()(double argument) const;
virtual double operator ()(const Argument & a) const;
// Dimensionality
virtual unsigned int dimensionality() const;
private:
// It is illegal to assign a FunctionNumDeriv
const FunctionNumDeriv & operator=(const FunctionNumDeriv &right);
// The function we're differntiating.
const AbsFunction *_arg1;
const unsigned int _wrtIndex;
// helper data and methods to let us code Argument and double similarly
double numericalDerivative
( double (FunctionNumDeriv::*f)(double)const, double x ) const;
double f_x (double x) const;
double f_Arg (double x) const;
mutable Argument _xArg;
};
} // namespace Genfun
#endif
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