ROOT 6.10/09 Reference Guide 
Specialized Gradient interface(abstract class) for one dimensional functions It provides a method to evaluate the derivative of the function, Derivative and a method to evaluate at the same time the function and the derivative FdF.
Concrete classes should derive from ROOT::Math::IGradientFunctionOneDim and not from this class.
Definition at line 251 of file IFunction.h.
Public Member Functions  
virtual  ~IGradientOneDim () 
virtual destructor More...  
double  Derivative (double x) const 
Return the derivative of the function at a point x Use the private method DoDerivative. More...  
double  Derivative (const double *x) const 
Compatibility method with multidimensional interface for partial derivative. More...  
virtual void  FdF (double x, double &f, double &df) const =0 
Optimized method to evaluate at the same time the function value and derivative at a point x. More...  
void  FdF (const double *x, double &f, double *df) const 
Compatibility method with multidimensional interface for Gradient and function evaluation. More...  
void  Gradient (const double *x, double *g) const 
Compatibility method with multidimensional interface for Gradient. More...  
Private Member Functions  
virtual double  DoDerivative (double x) const =0 
function to evaluate the derivative with respect each coordinate. More...  
#include <Math/IFunction.h>

inlinevirtual 
virtual destructor
Definition at line 256 of file IFunction.h.

inline 
Return the derivative of the function at a point x Use the private method DoDerivative.
Definition at line 262 of file IFunction.h.

inline 
Compatibility method with multidimensional interface for partial derivative.
Definition at line 281 of file IFunction.h.

privatepure virtual 
function to evaluate the derivative with respect each coordinate.
To be implemented by the derived class
Implemented in ROOT::Math::GradFunctor1D, ROOT::Math::Polynomial, and ROOT::Math::WrappedTF1.

pure virtual 
Optimized method to evaluate at the same time the function value and derivative at a point x.
Often both value and derivatives are needed and it is often more efficient to compute them at the same time. Derived class should implement this method if performances play an important role and if it is faster to evaluate value and derivative at the same time
Implemented in ROOT::Math::IGradientFunctionOneDim, ROOT::Math::Polynomial, and ROOT::Math::WrappedTF1.

inline 
Compatibility method with multidimensional interface for Gradient and function evaluation.
Definition at line 297 of file IFunction.h.

inline 
Compatibility method with multidimensional interface for Gradient.
Definition at line 289 of file IFunction.h.