RooFoamGenerator Class Reference

Generic Monte Carlo toy 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 32 of file RooFoamGenerator.h.

Public Member Functions
	RooFoamGenerator ()=default
	RooFoamGenerator (const RooAbsReal &func, const RooArgSet &genVars, const RooNumGenConfig &config, bool verbose=false, const RooAbsReal *maxFuncVal=nullptr)
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 ()
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
std::unique_ptr< TFoamIntegrand >	_binding
	Binding of RooAbsReal to TFoam function interface.
std::vector< double >	_range
	Range of observables to be generated ;.
std::unique_ptr< TFoam >	_tfoam
	Instance of TFOAM generator.
std::vector< double >	_vec
	Transfer array for FOAM output.
std::vector< double >	_xmin
	Lower bound of observables to be generated ;.
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-master/rootspi/rdoc/src/master/roofit/roofitcore/src/RooFoamGenerator.h>

Inheritance diagram for RooFoamGenerator:

Constructor & Destructor Documentation

RooFoamGenerator() [1/2]

RooFoamGenerator::RooFoamGenerator ( )

default

RooFoamGenerator() [2/2]

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

Definition at line 105 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 36 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 140 of file RooFoamGenerator.cxx.

generatorName()

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

overridevirtual

Return unique name of generator implementation.

Implements RooAbsNumGenerator.

Definition at line 158 of file RooFoamGenerator.cxx.

registerSampler()

void RooFoamGenerator::registerSampler ( RooNumGenFactory &  fact )

staticprotected

Register RooIntegrator1D, is parameters and capabilities with RooNumIntFactory.

Definition at line 86 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

std::unique_ptr<TFoamIntegrand> RooFoamGenerator::_binding

protected

Binding of RooAbsReal to TFoam function interface.

Definition at line 55 of file RooFoamGenerator.h.

_range

std::vector<double> RooFoamGenerator::_range

protected

Range of observables to be generated ;.

Definition at line 58 of file RooFoamGenerator.h.

_tfoam

std::unique_ptr<TFoam> RooFoamGenerator::_tfoam

protected

Instance of TFOAM generator.

Definition at line 56 of file RooFoamGenerator.h.

_vec

std::vector<double> RooFoamGenerator::_vec

protected

Transfer array for FOAM output.

Definition at line 59 of file RooFoamGenerator.h.

_xmin

std::vector<double> RooFoamGenerator::_xmin

protected

Lower bound of observables to be generated ;.

Definition at line 57 of file RooFoamGenerator.h.