ROOT   6.08/07 Reference Guide

Definition at line 17 of file Quad1F.h.

## Public Member Functions

const FCNBaseBase () const

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

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...

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...

Public Member Functions inherited from ROOT::Minuit2::FCNGradientBase

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/build/workspace/root-makedoc-v608/rootspi/rdoc/src/v6-08-00-patches/math/minuit2/test/MnTutorial/Quad1F.h>

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## Constructor & Destructor Documentation

inline

Definition at line 21 of file Quad1F.h.

inline

Definition at line 23 of file Quad1F.h.

## ◆ Base()

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

Definition at line 43 of file Quad1F.h.

inlinevirtual

Definition at line 32 of file Quad1F.h.

## ◆ operator()()

 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.
MnUserParameters
VariableMetricMinimizer

Implements ROOT::Minuit2::FCNBase.

Definition at line 25 of file Quad1F.h.

## ◆ SetErrorDef()

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.

## ◆ Up()

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.