ROOT::Minuit2::Quad4FGrad Class Reference

Definition at line 42 of file Quad4F.h.

Public Member Functions
	Quad4FGrad ()
	~Quad4FGrad ()
double	operator() (const std::vector< double > &par) const
	The meaning of the vector of parameters is of course defined by the user, who uses the values of those parameters to calculate their function Value. More...
std::vector< double >	Gradient (const std::vector< double > &par) const
double	Up () const
	Error definition of the function. More...
Public Member Functions inherited from ROOT::Minuit2::FCNGradientBase
virtual	~FCNGradientBase ()
virtual bool	CheckGradient () const
Public Member Functions inherited from ROOT::Minuit2::FCNBase
virtual	~FCNBase ()
virtual double	ErrorDef () const
	Error definition of the function. More...
virtual void	SetErrorDef (double)
	add interface to set dynamically a new error definition Re-implement this function if needed. More...
Public Member Functions inherited from ROOT::Minuit2::GenericFunction
virtual	~GenericFunction ()

#include </mnt/vdb/lsf/workspace/root-makedoc/rootspi/rdoc/src/master/math/minuit2/test/MnTutorial/Quad4F.h>

Inheritance diagram for ROOT::Minuit2::Quad4FGrad:

Constructor & Destructor Documentation

ROOT::Minuit2::Quad4FGrad::Quad4FGrad ( )

inline

Definition at line 46 of file Quad4F.h.

ROOT::Minuit2::Quad4FGrad::~Quad4FGrad ( )

inline

Definition at line 48 of file Quad4F.h.

Member Function Documentation

std::vector<double> ROOT::Minuit2::Quad4FGrad::Gradient ( const std::vector< double > &  par ) const

inlinevirtual

Implements ROOT::Minuit2::FCNGradientBase.

Definition at line 60 of file Quad4F.h.

double ROOT::Minuit2::Quad4FGrad::operator() ( const std::vector< double > &  x ) const

inlinevirtual

The meaning of the vector of parameters is of course defined by the user, who uses the values of those parameters to calculate their function Value.

The order and the position of these parameters is strictly the one specified by the user when supplying the starting values for minimization. The starting values must be specified by the user, either via an std::vector<double> or the MnUserParameters supplied as input to the MINUIT minimizers such as VariableMetricMinimizer or MnMigrad. Later values are determined by MINUIT as it searches for the Minimum or performs whatever analysis is requested by the user.

Parameters

par	function parameters as defined by the user.

Returns

the Value of the function.

See Also

MnUserParameters

VariableMetricMinimizer

MnMigrad

Implements ROOT::Minuit2::FCNBase.

Definition at line 50 of file Quad4F.h.

double ROOT::Minuit2::Quad4FGrad::Up ( ) const

inlinevirtual

Error definition of the function.

MINUIT defines Parameter errors as the change in Parameter Value required to change the function Value by up. Normally, for chisquared fits it is 1, and for negative log likelihood, its Value is 0.5. If the user wants instead the 2-sigma errors for chisquared fits, it becomes 4, as Chi2(x+n*sigma) = Chi2(x) + n*n.

Implements ROOT::Minuit2::FCNBase.

Definition at line 76 of file Quad4F.h.

Collaboration diagram for ROOT::Minuit2::Quad4FGrad:

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The documentation for this class was generated from the following file:

• math/minuit2/test/MnTutorial/Quad4F.h