Generic Monte Carlo toy generator implement the accept/reject sampling technique on any positively valued function.

The RooAcceptReject generator is used by the various generator context classes to take care of generation of observables for which p.d.fs do not define internal methods

Definition at line 29 of file RooAcceptReject.h.

Public Member Functions
	RooAcceptReject ()

	RooAcceptReject (const RooAbsReal &func, const RooArgSet &genVars, const RooNumGenConfig &config, bool verbose=false, const RooAbsReal *maxFuncVal=nullptr)
	Initialize an accept-reject generator for the specified distribution function, which must be non-negative but does not need to be normalized over the variables to be generated, genVars.

bool	canSampleCategories () const override

bool	canSampleConditional () const override

RooAbsNumGenerator *	clone (const RooAbsReal &func, const RooArgSet &genVars, const RooArgSet &, const RooNumGenConfig &config, bool verbose=false, const RooAbsReal *maxFuncVal=nullptr) const override

const RooArgSet *	generateEvent (UInt_t remaining, double &resampleRatio) override
	Return a pointer to a generated event.

std::string const &	generatorName () const override
	Return unique name of generator implementation.

double	getFuncMax () override

Public Member Functions inherited from RooAbsNumGenerator
	RooAbsNumGenerator ()

	RooAbsNumGenerator (const RooAbsReal &func, const RooArgSet &genVars, bool verbose=false, const RooAbsReal *maxFuncVal=nullptr)
	Initialize an accept-reject generator for the specified distribution function, which must be non-negative but does not need to be normalized over the variables to be generated, genVars.

virtual	~RooAbsNumGenerator ()

void	attachParameters (const RooArgSet &vars)
	Reattach original parameters to function clone.

bool	isValid () const

bool	isVerbose () const

void	setVerbose (bool verbose=true)

Protected Member Functions
void	addEventToCache ()
	Add a trial event to our cache and update our estimates of the function maximum value and integral.

const RooArgSet *	nextAcceptedEvent ()
	Scan through events in the cache which have not been used yet, looking for the first accepted one which is added to the specified container.

Static Protected Member Functions
static void	registerSampler (RooNumGenFactory &fact)
	Register RooIntegrator1D, is parameters and capabilities with RooNumIntFactory.

Protected Attributes
UInt_t	_catSampleMult
	Number of discrete dimensions to be sampled.

UInt_t	_eventsUsed
	Accepted number of function samples.

double	_funcSum
	Maximum function value found, and sum of all samples made.

double	_maxFuncVal

UInt_t	_minTrials
	Minimum number of max.finding trials, total number of samples.

UInt_t	_minTrialsArray [4]
	Minimum number of trials samples for 1,2,3 dimensional problems.

UInt_t	_realSampleDim
	Number of real dimensions to be sampled.

UInt_t	_totalEvents
	Total number of function samples.

Protected Attributes inherited from RooAbsNumGenerator
std::unique_ptr< RooDataSet >	_cache
	Dataset holding generared values of observables.

RooArgSet	_catVars
	Set of discrete observabeles.

RooArgSet	_cloneSet
	Set owning clone of input function.

RooAbsReal *	_funcClone = nullptr
	Pointer to top level node of cloned function.

const RooAbsReal *	_funcMaxVal = nullptr
	Container for maximum function value.

RooRealVar *	_funcValPtr = nullptr
	RRV storing function value in output dataset.

std::unique_ptr< RooAbsArg >	_funcValStore
	RRV storing function value in context.

bool	_isValid = false
	Valid flag.

RooArgSet	_realVars
	Set of real valued observabeles.

bool	_verbose = false
	Verbose flag.

Friends
class	RooNumGenFactory

#include </home/sftnight/build/workspace/root-makedoc-v632/rootspi/rdoc/src/v6-32-00-patches/roofit/roofitcore/src/RooAcceptReject.h>

Inheritance diagram for RooAcceptReject:

[legend]

Constructor & Destructor Documentation

◆ RooAcceptReject() [1/2]

RooAcceptReject::RooAcceptReject ( )

inline

Definition at line 31 of file RooAcceptReject.h.

◆ RooAcceptReject() [2/2]

RooAcceptReject::RooAcceptReject	(	const RooAbsReal &	func,
		const RooArgSet &	genVars,
		const RooNumGenConfig &	config,
		bool	verbose = `false`,
		const RooAbsReal *	maxFuncVal = `nullptr`
	)

Initialize an accept-reject generator for the specified distribution function, which must be non-negative but does not need to be normalized over the variables to be generated, genVars.

The function and its dependents are cloned and so will not be disturbed during the generation process.

Definition at line 74 of file RooAcceptReject.cxx.

Member Function Documentation

◆ addEventToCache()

void RooAcceptReject::addEventToCache ( )

protected

Add a trial event to our cache and update our estimates of the function maximum value and integral.

Definition at line 271 of file RooAcceptReject.cxx.

◆ canSampleCategories()

bool RooAcceptReject::canSampleCategories ( ) const

inlineoverridevirtual

Reimplemented from RooAbsNumGenerator.

Definition at line 46 of file RooAcceptReject.h.

◆ canSampleConditional()

bool RooAcceptReject::canSampleConditional ( ) const

inlineoverridevirtual

Reimplemented from RooAbsNumGenerator.

Definition at line 45 of file RooAcceptReject.h.

◆ clone()

RooAbsNumGenerator * RooAcceptReject::clone	(	const RooAbsReal &	func,
		const RooArgSet &	genVars,
		const RooArgSet &	,
		const RooNumGenConfig &	config,
		bool	verbose = `false`,
		const RooAbsReal *	maxFuncVal = `nullptr`
	)		const

inlineoverridevirtual

Implements RooAbsNumGenerator.

Definition at line 35 of file RooAcceptReject.h.

◆ generateEvent()

const RooArgSet * RooAcceptReject::generateEvent	(	UInt_t	remaining,
		double &	resampleRatio
	)

overridevirtual

Return a pointer to a generated event.

The caller does not own the event and it will be overwritten by a subsequent call. The input parameter 'remaining' should contain your best guess at the total number of subsequent events you will request.

Implements RooAbsNumGenerator.

Definition at line 152 of file RooAcceptReject.cxx.

◆ generatorName()

std::string const & RooAcceptReject::generatorName ( ) const

overridevirtual

Return unique name of generator implementation.

Implements RooAbsNumGenerator.

Definition at line 320 of file RooAcceptReject.cxx.

◆ getFuncMax()

double RooAcceptReject::getFuncMax ( )

overridevirtual

Reimplemented from RooAbsNumGenerator.

Definition at line 299 of file RooAcceptReject.cxx.

◆ nextAcceptedEvent()

const RooArgSet * RooAcceptReject::nextAcceptedEvent ( )

protected

Scan through events in the cache which have not been used yet, looking for the first accepted one which is added to the specified container.

Return a pointer to the accepted event, or else zero if we use up the cache before we accept an event. The caller does not own the event and it will be overwritten by a subsequent call.

Definition at line 242 of file RooAcceptReject.cxx.

◆ registerSampler()

void RooAcceptReject::registerSampler ( RooNumGenFactory & fact )

staticprotected

Register RooIntegrator1D, is parameters and capabilities with RooNumIntFactory.

Definition at line 55 of file RooAcceptReject.cxx.

Friends And Related Symbol Documentation

◆ RooNumGenFactory

friend class RooNumGenFactory

friend

Definition at line 52 of file RooAcceptReject.h.

Member Data Documentation

◆ _catSampleMult

UInt_t RooAcceptReject::_catSampleMult

protected

Number of discrete dimensions to be sampled.

Definition at line 60 of file RooAcceptReject.h.

◆ _eventsUsed

UInt_t RooAcceptReject::_eventsUsed

protected

Accepted number of function samples.

Definition at line 63 of file RooAcceptReject.h.

◆ _funcSum

double RooAcceptReject::_funcSum

protected

Maximum function value found, and sum of all samples made.

Definition at line 58 of file RooAcceptReject.h.

◆ _maxFuncVal

double RooAcceptReject::_maxFuncVal

protected

Definition at line 58 of file RooAcceptReject.h.

◆ _minTrials

UInt_t RooAcceptReject::_minTrials

protected

Minimum number of max.finding trials, total number of samples.

Definition at line 61 of file RooAcceptReject.h.

◆ _minTrialsArray

UInt_t RooAcceptReject::_minTrialsArray[4]

protected

Minimum number of trials samples for 1,2,3 dimensional problems.

Definition at line 65 of file RooAcceptReject.h.

◆ _realSampleDim

UInt_t RooAcceptReject::_realSampleDim

protected

Number of real dimensions to be sampled.

Definition at line 59 of file RooAcceptReject.h.

◆ _totalEvents

UInt_t RooAcceptReject::_totalEvents

protected

Total number of function samples.

Definition at line 62 of file RooAcceptReject.h.

roofit/roofitcore/src/RooAcceptReject.h

roofit/roofitcore/src/RooAcceptReject.cxx

Public Member Functions

Protected Member Functions

Static Protected Member Functions

Protected Attributes

Friends

Constructor & Destructor Documentation

◆ RooAcceptReject() [1/2]

◆ RooAcceptReject() [2/2]

Member Function Documentation

◆ addEventToCache()

◆ canSampleCategories()

◆ canSampleConditional()

◆ clone()

◆ generateEvent()

◆ generatorName()

◆ getFuncMax()

◆ nextAcceptedEvent()

◆ registerSampler()

Friends And Related Symbol Documentation

◆ RooNumGenFactory

Member Data Documentation

◆ _catSampleMult

◆ _eventsUsed

◆ _funcSum

◆ _maxFuncVal

◆ _minTrials

◆ _minTrialsArray

◆ _realSampleDim

◆ _totalEvents