PowerLawChi2FCN Class Reference

Inheritance diagram for PowerLawChi2FCN:

List of all members.

Public Member Functions
	PowerLawChi2FCN (const std::vector< double > &meas, const std::vector< double > &pos, const std::vector< double > &mvar)
	~PowerLawChi2FCN ()
double	operator() (const std::vector< double > &par) const
double	Up () const
Private Attributes
std::vector< double >	fMeasurements
std::vector< double >	fPositions
std::vector< double >	fMVariances

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Detailed Description

Definition at line 48 of file PaulTest4.cxx.

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Constructor & Destructor Documentation

PowerLawChi2FCN::PowerLawChi2FCN	(	const std::vector< double > &	meas,
		const std::vector< double > &	pos,
		const std::vector< double > &	mvar
	)			[inline]

Definition at line 52 of file PaulTest4.cxx.

PowerLawChi2FCN::~PowerLawChi2FCN

(

)

[inline]

Definition at line 58 of file PaulTest4.cxx.

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Member Function Documentation

double PowerLawChi2FCN::operator()

(

const std::vector< double > &

par

)

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 60 of file PaulTest4.cxx.

References fMeasurements, fMVariances, fPositions, and n.

double PowerLawChi2FCN::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 72 of file PaulTest4.cxx.

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Member Data Documentation

std::vector<double> PowerLawChi2FCN::fMeasurements [private]

Definition at line 75 of file PaulTest4.cxx.

Referenced by operator()().

std::vector<double> PowerLawChi2FCN::fPositions [private]

Definition at line 76 of file PaulTest4.cxx.

Referenced by operator()().

std::vector<double> PowerLawChi2FCN::fMVariances [private]

Definition at line 77 of file PaulTest4.cxx.

Referenced by operator()().

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

• math/minuit2/test/MnSim/PaulTest4.cxx

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