MyFCN Class Reference

Inheritance diagram for MyFCN:

List of all members.

Public Member Functions
	MyFCN (double a=100, double b=1)
double	operator() (const std::vector< double > &x) const
double	Up () const
Private Attributes
double	fA
double	fB

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Detailed Description

test of a pure minimization passing a user FCN class directly to the TFitterMinuit

Definition at line 21 of file testMinimize.cxx.

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Constructor & Destructor Documentation

MyFCN::MyFCN	(	double	a = 100,
		double	b = 1
	)			[inline]

Definition at line 25 of file testMinimize.cxx.

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Member Function Documentation

double MyFCN::operator()

(

const std::vector< double > &

x

)

const [inline, virtual]

The meaning of the vector of parameters is of course defined by the user, who uses the values of those parameters to calculate his 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 27 of file testMinimize.cxx.

References fA, and fB.

double MyFCN::Up

(

)

const [inline, virtual]

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.

Todo:

Comment a little bit better with links!!!!!!!!!!!!!!!!! Idem for ErrorDef()

Implements ROOT::Minuit2::FCNBase.

Definition at line 32 of file testMinimize.cxx.

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Member Data Documentation

double MyFCN::fA [private]

Definition at line 36 of file testMinimize.cxx.

Referenced by operator()().

double MyFCN::fB [private]

Definition at line 37 of file testMinimize.cxx.

Referenced by operator()().

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

• math/minuit2/test/testMinimize.cxx

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