Genfun::GaudiMathImplementation Namespace Reference

Classes
class	Constant
	Fixed constant function. More...
class	AdapterIFunction
	constructor from the IFunction ( see AIDA/IFunction.h) More...
class	Adapter2DoubleFunction
	constructor from the trivial function with two argument More...
class	Adapter3DoubleFunction
	constructor from the trivial function with two argument More...
class	SimpleFunction
class	GSLFunctionWithError
class	GSLFunctionWithMode
class	GSLFunctionWithModeAndError
class	NumericalDefiniteIntegral
	This class allows the numerical evaluation of the following functions:. More...
class	NumericalDerivative
	Numerical derivative (using GSL adaptive numerical differentiation). More...
class	NumericalIndefiniteIntegral
	The simple class for numerical integrations. More...
class	SplineBase
class	GSLSpline
class	GSLSplineDeriv
class	GSLSplineDeriv2
class	GSLSplineInteg
class	GSL_Helper
	the simple structure to be used for adaption interface Genfun::AbsFunction to gsl_function structure More...
Typedefs
typedef Genfun::GaudiMathImplementation::SimpleFunction	GSLFunction
	the actual type for primitive adaptor
Functions
double	GSL_Adaptor (double x, void *params)

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Typedef Documentation

typedef Genfun::GaudiMathImplementation::SimpleFunction Genfun::GaudiMathImplementation::GSLFunction

the actual type for primitive adaptor

Definition at line 30 of file GSLFunAdapters.h.

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Function Documentation

double Genfun::GaudiMathImplementation::GSL_Adaptor	(	double	x,
		void *	params
	)

Definition at line 35 of file Helpers.cpp.

    {
      // get parameters 
      GSL_Helper* aux = (GSL_Helper*) params ;
      // decode parameters 
      const Genfun::AbsFunction& function = aux -> m_function  ;
      const size_t               index    = aux -> m_index     ;
      Genfun::Argument&          argument = aux -> m_argument  ;
      // save the current value of argument 
      const double x_prev = argument[index] ;
      // modify the argument 
      argument[index]= x       ; 
      // evaluate the function
      const double fun = function( argument ) ;
      // restore the argument 
      argument[index] = x_prev  ;
      return fun ;
    }