ROOT::Minuit2::Quad1F Class Reference

Definition at line 17 of file Quad1F.h.

Public Member Functions
	Quad1F ()
	~Quad1F ()
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
void	SetErrorDef (double up)
	add interface to set dynamically a new error definition Re-implement this function if needed. More...
double	Up () const
	Error definition of the function. More...
const FCNBase *	Base () const
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...
Public Member Functions inherited from ROOT::Minuit2::GenericFunction
virtual	~GenericFunction ()

Private Attributes
double	fErrorDef

#include </mnt/vdb/lsf/workspace/root-makedoc-v606/rootspi/rdoc/src/v6-06-00-patches/math/minuit2/test/MnTutorial/Quad1F.h>

Inheritance diagram for ROOT::Minuit2::Quad1F:

Collaboration diagram for ROOT::Minuit2::Quad1F:

Constructor & Destructor Documentation

ROOT::Minuit2::Quad1F::Quad1F ( )

inline

Definition at line 21 of file Quad1F.h.

ROOT::Minuit2::Quad1F::~Quad1F ( )

inline

Definition at line 23 of file Quad1F.h.

Member Function Documentation

const FCNBase* ROOT::Minuit2::Quad1F::Base ( ) const

inline

Definition at line 43 of file Quad1F.h.

std::vector<double> ROOT::Minuit2::Quad1F::Gradient ( const std::vector< double > &  par ) const

inlinevirtual

Implements ROOT::Minuit2::FCNGradientBase.

Definition at line 32 of file Quad1F.h.

double ROOT::Minuit2::Quad1F::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 25 of file Quad1F.h.

void ROOT::Minuit2::Quad1F::SetErrorDef ( double  )

inlinevirtual

add interface to set dynamically a new error definition Re-implement this function if needed.

Reimplemented from ROOT::Minuit2::FCNBase.

Definition at line 39 of file Quad1F.h.

Referenced by main().

double ROOT::Minuit2::Quad1F::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 41 of file Quad1F.h.

Member Data Documentation

double ROOT::Minuit2::Quad1F::fErrorDef

private

Definition at line 46 of file Quad1F.h.

Referenced by SetErrorDef(), and Up().

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

• math/minuit2/test/MnTutorial/Quad1F.h