Fitter Class Reference

#include <Fitter.h>

Collaboration diagram for Fitter:

Public Member Functions
void	fit ()
	Run the fit. More...
void	fitForce ()
	Force minimum finding. More...
void	fitImprove ()
void	fitOnce ()
	Fitter (OptParser *arg, RooWorkspace *w, TString name)
void	fitTwice ()
	Perform two fits, each time using different start parameters, retain the smallest chi2. More...
float	getChi2 ()
	Returns minimum chi2 value obtained by fit(). More...
int	getStatus ()
	Check the fit result. More...
void	print ()
void	setStartpars (const RooArgSet *pars)
void	setStartparsFirstFit (const RooArgSet *pars)
void	setStartparsSecondFit (const RooArgSet *pars)
	~Fitter ()

Public Attributes
OptParser *	arg
	command line arguments More...
TString	name
	Name of the pdf. Call combine() first. More...
int	nFit1Best
	counter, how many times did fit 1 of fitTwice() give smaller chi2 More...
int	nFit2Best
	counter, how many times did fit 2 of fitTwice() give smaller chi2 More...
TString	obsName
	dataset name of observables More...
TString	parsName
	set name of physics parameters More...
TString	pdfName
	PDF name in workspace, derived from name. More...
RooArgSet const *	startparsFirstFit
	start parameters to be used by all fit routines that run one fit, and by the first fit of fitTwice() More...
RooArgSet const *	startparsSecondFit
	start parameters to be used by the second fit of fitTwice() More...
RooFitResult *	theResult
	the final result More...
RooWorkspace *	w
	holds all input pdfs, parameters, and observables, as well as the combination More...

Detailed Description

Definition at line 18 of file Fitter.h.

Constructor & Destructor Documentation

Fitter()

Fitter::Fitter	(	OptParser *	arg,
		RooWorkspace *	w,
		TString	name
	)

Definition at line 3 of file Fitter.cpp.

~Fitter()

Fitter::~Fitter

(

)

Definition at line 19 of file Fitter.cpp.

Member Function Documentation

fit()

void Fitter::fit

(

)

Run the fit.

Select a fit method here.

Definition at line 112 of file Fitter.cpp.

fitForce()

void Fitter::fitForce

(

)

Force minimum finding.

Will use the start parameters set by setStartparsFirstFit().

Definition at line 77 of file Fitter.cpp.

fitImprove()

void Fitter::fitImprove

(

)

fitOnce()

void Fitter::fitOnce

(

)

fitTwice()

void Fitter::fitTwice

(

)

Perform two fits, each time using different start parameters, retain the smallest chi2.

Note: To debug the start paramter issues, remember that fitToMinBringBackAngles() may perform a second fit, which then uses the start parameters of the first. This will show up in the RooFitResult.

Definition at line 29 of file Fitter.cpp.

getChi2()

float Fitter::getChi2

(

)

Returns minimum chi2 value obtained by fit().

Returns

min chi2; 1e6 if fit wasn't performed yet

< else we have many entries at -1e27 in the ToyTree

Definition at line 88 of file Fitter.cpp.

getStatus()

int Fitter::getStatus

(

)

Check the fit result.

We require a good covariance matrix and a reasonable EDM for a status "ok".

Returns

Status code: 0=ok, 1=error, -1=fit() didn't run

Definition at line 100 of file Fitter.cpp.

print()

void Fitter::print

(

)

Definition at line 119 of file Fitter.cpp.

setStartpars()

void Fitter::setStartpars ( const RooArgSet *  pars )

inline

Definition at line 33 of file Fitter.h.

setStartparsFirstFit()

void Fitter::setStartparsFirstFit ( const RooArgSet *  pars )

inline

Definition at line 34 of file Fitter.h.

setStartparsSecondFit()

void Fitter::setStartparsSecondFit ( const RooArgSet *  pars )

inline

Definition at line 35 of file Fitter.h.

Member Data Documentation

arg

OptParser* Fitter::arg

command line arguments

Definition at line 35 of file Fitter.h.

name

TString Fitter::name

Name of the pdf. Call combine() first.

Definition at line 39 of file Fitter.h.

nFit1Best

int Fitter::nFit1Best

counter, how many times did fit 1 of fitTwice() give smaller chi2

Definition at line 42 of file Fitter.h.

nFit2Best

int Fitter::nFit2Best

counter, how many times did fit 2 of fitTwice() give smaller chi2

Definition at line 43 of file Fitter.h.

obsName

TString Fitter::obsName

dataset name of observables

Definition at line 45 of file Fitter.h.

parsName

TString Fitter::parsName

set name of physics parameters

Definition at line 46 of file Fitter.h.

pdfName

TString Fitter::pdfName

PDF name in workspace, derived from name.

Definition at line 44 of file Fitter.h.

startparsFirstFit

RooArgSet const* Fitter::startparsFirstFit

start parameters to be used by all fit routines that run one fit, and by the first fit of fitTwice()

Definition at line 40 of file Fitter.h.

startparsSecondFit

RooArgSet const* Fitter::startparsSecondFit

start parameters to be used by the second fit of fitTwice()

Definition at line 41 of file Fitter.h.

theResult

RooFitResult* Fitter::theResult

the final result

Definition at line 47 of file Fitter.h.

w

RooWorkspace* Fitter::w

holds all input pdfs, parameters, and observables, as well as the combination

Definition at line 38 of file Fitter.h.

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

• /Users/matt/Scratch/lhcb/CombinationCode/gammacombo/core/include/Fitter.h
• /Users/matt/Scratch/lhcb/CombinationCode/gammacombo/core/src/Fitter.cpp