Class RooFoamGenerator is a generic toy monte carlo generator that implement the TFOAM sampling technique on any positively valued function.

The RooFoamGenerator 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.

The foam generator reacts to the following config options:

nCell[123N]D
nSample
chatLevel Access those using: myPdf->specialGeneratorConfig()->getConfigSection("RooFoamGenerator").setRealValue("nSample",1e4);

See also: rf902_numgenconfig.C

Definition at line 31 of file RooFoamGenerator.h.

Public Member Functions
	RooFoamGenerator ()

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

	~RooFoamGenerator () override
	Destructor.

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

TFoam &	engine ()

const RooArgSet *	generateEvent (UInt_t remaining, double &resampleRatio) override
	are we actually generating anything? (the cache always contains at least our function value)

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

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 ()
	Destructor.

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

virtual double	getFuncMax ()

bool	isValid () const

bool	isVerbose () const

void	setVerbose (bool verbose=true)

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

Protected Attributes
RooTFoamBinding *	_binding
	Binding of RooAbsReal to TFoam function interface.

double *	_range
	Range of observables to be generated ;.

TFoam *	_tfoam
	Instance of TFOAM generator.

double *	_vec
	Transfer array for FOAM output.

double *	_xmin
	Lower bound of observables to be generated ;.

Protected Attributes inherited from RooAbsNumGenerator
RooDataSet *	_cache
	Dataset holding generared values of observables.

RooArgSet	_catVars

RooArgSet *	_cloneSet
	Set owning clone of input function.

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

const RooAbsReal *	_funcMaxVal
	Container for maximum function value.

RooRealVar *	_funcValPtr
	RRVs storing function value in context and in output dataset.

RooRealVar *	_funcValStore

bool	_isValid
	Verbose and valid flag.

RooArgSet	_realVars
	Sets of discrete and real valued observabeles.

bool	_verbose

Friends
class	RooNumGenFactory

#include </home/sftnight/build/workspace/root-makedoc-v628/rootspi/rdoc/src/v6-28-00-patches/roofit/roofitcore/src/RooFoamGenerator.h>

Inheritance diagram for RooFoamGenerator:

[legend]

Constructor & Destructor Documentation

◆ RooFoamGenerator() [1/2]

RooFoamGenerator::RooFoamGenerator ( )

inline

Definition at line 33 of file RooFoamGenerator.h.

◆ RooFoamGenerator() [2/2]

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

Definition at line 81 of file RooFoamGenerator.cxx.

◆ ~RooFoamGenerator()

RooFoamGenerator::~RooFoamGenerator ( )

override

Destructor.

Definition at line 118 of file RooFoamGenerator.cxx.

Member Function Documentation

◆ canSampleCategories()

bool RooFoamGenerator::canSampleCategories ( ) const

inlineoverridevirtual

Reimplemented from RooAbsNumGenerator.

Definition at line 46 of file RooFoamGenerator.h.

◆ canSampleConditional()

bool RooFoamGenerator::canSampleConditional ( ) const

inlineoverridevirtual

Reimplemented from RooAbsNumGenerator.

Definition at line 45 of file RooFoamGenerator.h.

◆ clone()

RooAbsNumGenerator * RooFoamGenerator::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 RooFoamGenerator.h.

◆ engine()

TFoam & RooFoamGenerator::engine ( )

inline

Definition at line 43 of file RooFoamGenerator.h.

◆ generateEvent()

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

overridevirtual

are we actually generating anything? (the cache always contains at least our function value)

Implements RooAbsNumGenerator.

Definition at line 132 of file RooFoamGenerator.cxx.

◆ generatorName()

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

overridevirtual

Return unique name of generator implementation.

Implements RooAbsNumGenerator.

Definition at line 150 of file RooFoamGenerator.cxx.

◆ registerSampler()

void RooFoamGenerator::registerSampler ( RooNumGenFactory & fact )

staticprotected

Register RooIntegrator1D, is parameters and capabilities with RooNumIntFactory.

Definition at line 62 of file RooFoamGenerator.cxx.

Friends And Related Symbol Documentation

◆ RooNumGenFactory

friend class RooNumGenFactory

friend

Definition at line 52 of file RooFoamGenerator.h.

Member Data Documentation

◆ _binding

RooTFoamBinding* RooFoamGenerator::_binding

protected

Binding of RooAbsReal to TFoam function interface.

Definition at line 55 of file RooFoamGenerator.h.

◆ _range

double* RooFoamGenerator::_range

protected

Range of observables to be generated ;.

Definition at line 58 of file RooFoamGenerator.h.

◆ _tfoam

TFoam* RooFoamGenerator::_tfoam

protected

Instance of TFOAM generator.

Definition at line 56 of file RooFoamGenerator.h.

◆ _vec

double* RooFoamGenerator::_vec

protected

Transfer array for FOAM output.

Definition at line 59 of file RooFoamGenerator.h.

◆ _xmin

double* RooFoamGenerator::_xmin

protected

Lower bound of observables to be generated ;.

Definition at line 57 of file RooFoamGenerator.h.

roofit/roofitcore/src/RooFoamGenerator.h

roofit/roofitcore/src/RooFoamGenerator.cxx

Public Member Functions

Static Protected Member Functions

Protected Attributes

Friends

Constructor & Destructor Documentation

◆ RooFoamGenerator() [1/2]

◆ RooFoamGenerator() [2/2]

◆ ~RooFoamGenerator()

Member Function Documentation

◆ canSampleCategories()

◆ canSampleConditional()

◆ clone()

◆ engine()

◆ generateEvent()

◆ generatorName()

◆ registerSampler()

Friends And Related Symbol Documentation

◆ RooNumGenFactory

Member Data Documentation

◆ _binding

◆ _range

◆ _tfoam

◆ _vec

◆ _xmin