Class RooGenContext implement a universal generator context for all RooAbsPdf classes that do not have or need a specialized generator context.

This generator context queries the input p.d.f which observables it can generate internally and delegates generation of those observables to the p.d.f if it deems that safe. The other observables are generated use a RooAcceptReject sampling technique.

Definition at line 30 of file RooGenContext.h.

Public Member Functions
	RooGenContext (const RooAbsPdf &model, const RooArgSet &vars, const RooDataSet prototype=nullptr, const RooArgSet auxProto=nullptr, bool verbose=false, const RooArgSet *forceDirect=nullptr)
	Initialize a new context for generating events with the specified variables, using the specified PDF model.

	~RooGenContext () override
	Destructor.

void	attach (const RooArgSet &params) override
	Attach the cloned model to the event buffer we will be filling.

TClass *	IsA () const override

void	printMultiline (std::ostream &os, Int_t content, bool verbose=false, TString indent="") const override
	Printing interface.

void	Streamer (TBuffer &) override
	Stream an object of class TObject.

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

Public Member Functions inherited from RooAbsGenContext
	RooAbsGenContext (const RooAbsPdf &model, const RooArgSet &vars, const RooDataSet prototype=nullptr, const RooArgSet auxProto=nullptr, bool _verbose=false)
	Constructor.

Int_t	defaultPrintContents (Option_t *opt) const override
	Define default contents when printing.

StyleOption	defaultPrintStyle (Option_t *opt) const override
	Define default print style.

virtual RooDataSet *	generate (double nEvents=0, bool skipInit=false, bool extendedMode=false)
	Generate the specified number of events with nEvents>0 and and return a dataset containing the generated events.

bool	isValid () const

bool	isVerbose () const

void	Print (Option_t *options=nullptr) const override
	This method must be overridden when a class wants to print itself.

void	printArgs (std::ostream &os) const override
	Print arguments of context, i.e. the observables being generated in this context.

void	printClassName (std::ostream &os) const override
	Print class name of context.

void	printName (std::ostream &os) const override
	Print name of context.

void	printTitle (std::ostream &os) const override
	Print title of context.

virtual void	setExpectedData (bool)

virtual void	setProtoDataOrder (Int_t *lut)
	Set the traversal order of prototype data to that in the lookup tables passed as argument.

void	setVerbose (bool verbose=true)

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

Public Member Functions inherited from TNamed
	TNamed ()

	TNamed (const char name, const char title)

	TNamed (const TNamed &named)
	TNamed copy ctor.

	TNamed (const TString &name, const TString &title)

virtual	~TNamed ()
	TNamed destructor.

void	Clear (Option_t *option="") override
	Set name and title to empty strings ("").

TObject *	Clone (const char *newname="") const override
	Make a clone of an object using the Streamer facility.

Int_t	Compare (const TObject *obj) const override
	Compare two TNamed objects.

void	Copy (TObject &named) const override
	Copy this to obj.

virtual void	FillBuffer (char *&buffer)
	Encode TNamed into output buffer.

const char *	GetName () const override
	Returns name of object.

const char *	GetTitle () const override
	Returns title of object.

ULong_t	Hash () const override
	Return hash value for this object.

TClass *	IsA () const override

Bool_t	IsSortable () const override

void	ls (Option_t *option="") const override
	List TNamed name and title.

TNamed &	operator= (const TNamed &rhs)
	TNamed assignment operator.

void	Print (Option_t *option="") const override
	Print TNamed name and title.

virtual void	SetName (const char *name)
	Set the name of the TNamed.

virtual void	SetNameTitle (const char name, const char title)
	Set all the TNamed parameters (name and title).

virtual void	SetTitle (const char *title="")
	Set the title of the TNamed.

virtual Int_t	Sizeof () const
	Return size of the TNamed part of the TObject.

void	Streamer (TBuffer &) override
	Stream an object of class TObject.

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

Public Member Functions inherited from TObject
	TObject ()
	TObject constructor.

	TObject (const TObject &object)
	TObject copy ctor.

virtual	~TObject ()
	TObject destructor.

void	AbstractMethod (const char *method) const
	Use this method to implement an "abstract" method that you don't want to leave purely abstract.

virtual void	AppendPad (Option_t *option="")
	Append graphics object to current pad.

virtual void	Browse (TBrowser *b)
	Browse object. May be overridden for another default action.

ULong_t	CheckedHash ()
	Check and record whether this class has a consistent Hash/RecursiveRemove setup (*) and then return the regular Hash value for this object.

virtual const char *	ClassName () const
	Returns name of class to which the object belongs.

virtual void	Delete (Option_t *option="")
	Delete this object.

virtual Int_t	DistancetoPrimitive (Int_t px, Int_t py)
	Computes distance from point (px,py) to the object.

virtual void	Draw (Option_t *option="")
	Default Draw method for all objects.

virtual void	DrawClass () const
	Draw class inheritance tree of the class to which this object belongs.

virtual TObject *	DrawClone (Option_t *option="") const
	Draw a clone of this object in the current selected pad with: `gROOT->SetSelectedPad(c1)`.

virtual void	Dump () const
	Dump contents of object on stdout.

virtual void	Error (const char method, const char msgfmt,...) const
	Issue error message.

virtual void	Execute (const char method, const char params, Int_t *error=nullptr)
	Execute method on this object with the given parameter string, e.g.

virtual void	Execute (TMethod method, TObjArray params, Int_t *error=nullptr)
	Execute method on this object with parameters stored in the TObjArray.

virtual void	ExecuteEvent (Int_t event, Int_t px, Int_t py)
	Execute action corresponding to an event at (px,py).

virtual void	Fatal (const char method, const char msgfmt,...) const
	Issue fatal error message.

virtual TObject *	FindObject (const char *name) const
	Must be redefined in derived classes.

virtual TObject *	FindObject (const TObject *obj) const
	Must be redefined in derived classes.

virtual Option_t *	GetDrawOption () const
	Get option used by the graphics system to draw this object.

virtual const char *	GetIconName () const
	Returns mime type name of object.

virtual char *	GetObjectInfo (Int_t px, Int_t py) const
	Returns string containing info about the object at position (px,py).

virtual Option_t *	GetOption () const

virtual UInt_t	GetUniqueID () const
	Return the unique object id.

virtual Bool_t	HandleTimer (TTimer *timer)
	Execute action in response of a timer timing out.

Bool_t	HasInconsistentHash () const
	Return true is the type of this object is known to have an inconsistent setup for Hash and RecursiveRemove (i.e.

virtual void	Info (const char method, const char msgfmt,...) const
	Issue info message.

virtual Bool_t	InheritsFrom (const char *classname) const
	Returns kTRUE if object inherits from class "classname".

virtual Bool_t	InheritsFrom (const TClass *cl) const
	Returns kTRUE if object inherits from TClass cl.

virtual void	Inspect () const
	Dump contents of this object in a graphics canvas.

void	InvertBit (UInt_t f)

Bool_t	IsDestructed () const
	IsDestructed.

virtual Bool_t	IsEqual (const TObject *obj) const
	Default equal comparison (objects are equal if they have the same address in memory).

virtual Bool_t	IsFolder () const
	Returns kTRUE in case object contains browsable objects (like containers or lists of other objects).

R__ALWAYS_INLINE Bool_t	IsOnHeap () const

R__ALWAYS_INLINE Bool_t	IsZombie () const

void	MayNotUse (const char *method) const
	Use this method to signal that a method (defined in a base class) may not be called in a derived class (in principle against good design since a child class should not provide less functionality than its parent, however, sometimes it is necessary).

virtual Bool_t	Notify ()
	This method must be overridden to handle object notification.

void	Obsolete (const char method, const char asOfVers, const char *removedFromVers) const
	Use this method to declare a method obsolete.

void	operator delete (void *ptr)
	Operator delete.

void	operator delete[] (void *ptr)
	Operator delete [].

void *	operator new (size_t sz)

void *	operator new (size_t sz, void *vp)

void *	operator new[] (size_t sz)

void *	operator new[] (size_t sz, void *vp)

TObject &	operator= (const TObject &rhs)
	TObject assignment operator.

virtual void	Paint (Option_t *option="")
	This method must be overridden if a class wants to paint itself.

virtual void	Pop ()
	Pop on object drawn in a pad to the top of the display list.

virtual Int_t	Read (const char *name)
	Read contents of object with specified name from the current directory.

virtual void	RecursiveRemove (TObject *obj)
	Recursively remove this object from a list.

void	ResetBit (UInt_t f)

virtual void	SaveAs (const char filename="", Option_t option="") const
	Save this object in the file specified by filename.

virtual void	SavePrimitive (std::ostream &out, Option_t *option="")
	Save a primitive as a C++ statement(s) on output stream "out".

void	SetBit (UInt_t f)

void	SetBit (UInt_t f, Bool_t set)
	Set or unset the user status bits as specified in f.

virtual void	SetDrawOption (Option_t *option="")
	Set drawing option for object.

virtual void	SetUniqueID (UInt_t uid)
	Set the unique object id.

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

virtual void	SysError (const char method, const char msgfmt,...) const
	Issue system error message.

R__ALWAYS_INLINE Bool_t	TestBit (UInt_t f) const

Int_t	TestBits (UInt_t f) const

virtual void	UseCurrentStyle ()
	Set current style settings in this object This function is called when either TCanvas::UseCurrentStyle or TROOT::ForceStyle have been invoked.

virtual void	Warning (const char method, const char msgfmt,...) const
	Issue warning message.

virtual Int_t	Write (const char *name=nullptr, Int_t option=0, Int_t bufsize=0)
	Write this object to the current directory.

virtual Int_t	Write (const char *name=nullptr, Int_t option=0, Int_t bufsize=0) const
	Write this object to the current directory.

Public Member Functions inherited from RooPrintable
	RooPrintable ()

virtual	~RooPrintable ()

virtual void	printAddress (std::ostream &os) const
	Print class name of object.

virtual void	printExtras (std::ostream &os) const
	Interface to print extras of object.

virtual void	printStream (std::ostream &os, Int_t contents, StyleOption style, TString indent="") const
	Print description of object on ostream, printing contents set by contents integer, which is interpreted as an OR of 'enum ContentsOptions' values and in the style given by 'enum StyleOption'.

virtual void	printTree (std::ostream &os, TString indent="") const
	Interface for tree structure printing of object.

virtual void	printValue (std::ostream &os) const
	Interface to print value of object.

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

Static Public Member Functions
static TClass *	Class ()

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static const char *	DeclFileName ()

Static Public Member Functions inherited from RooAbsGenContext
static TClass *	Class ()

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static const char *	DeclFileName ()

Static Public Member Functions inherited from TNamed
static TClass *	Class ()

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static const char *	DeclFileName ()

Static Public Member Functions inherited from TObject
static TClass *	Class ()

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static const char *	DeclFileName ()

static Longptr_t	GetDtorOnly ()
	Return destructor only flag.

static Bool_t	GetObjectStat ()
	Get status of object stat flag.

static void	SetDtorOnly (void *obj)
	Set destructor only flag.

static void	SetObjectStat (Bool_t stat)
	Turn on/off tracking of objects in the TObjectTable.

Static Public Member Functions inherited from RooPrintable
static TClass *	Class ()

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static const char *	DeclFileName ()

static std::ostream &	defaultPrintStream (std::ostream *os=nullptr)
	Return a reference to the current default stream to use in Print().

static void	nameFieldLength (Int_t newLen)
	Set length of field reserved from printing name of RooAbsArgs in multi-line collection printing to given amount.

Protected Member Functions
void	generateEvent (RooArgSet &theEvent, Int_t remaining) override
	Generate one event.

void	initGenerator (const RooArgSet &theEvent) override
	Perform one-time initialization of the generator context.

Protected Member Functions inherited from RooAbsGenContext
virtual RooDataSet *	createDataSet (const char name, const char title, const RooArgSet &obs)
	Create an empty dataset to hold the events that will be generated.

void	resampleData (double &ratio)
	Rescale existing output buffer with given ratio.

Protected Member Functions inherited from TObject
virtual void	DoError (int level, const char location, const char fmt, va_list va) const
	Interface to ErrorHandler (protected).

void	MakeZombie ()

Protected Attributes
std::unique_ptr< RooRealIntegral >	_acceptRejectFunc
	Projection function to be passed to accept/reject sampler.

double	_area {0.}

RooArgSet	_cloneSet
	Clone of all nodes of input p.d.f.

Int_t	_code
	Internal generation code.

RooArgSet	_directVars

RooAbsNumGenerator *	_generator
	MC sampling generation engine.

double	_maxProb {0.}

RooRealVar *	_maxVar
	Variable holding maximum value of p.d.f.

double	_norm {0.}
	Maximum probability, p.d.f area and normalization.

RooArgSet	_otherVars
	List of observables generated internally, randomly, and by accept/reject sampling.

RooAbsPdf *	_pdfClone
	Clone of input p.d.f.

RooArgSet	_uniformVars

Int_t	_updateFMaxPerEvent
	If true, maximum p.d.f value needs to be recalculated for each event.

Protected Attributes inherited from RooAbsGenContext
UInt_t	_expectedEvents
	Number of expected events from extended p.d.f.

RooAbsPdf::ExtendMode	_extendMode
	Extended mode capabilities of p.d.f.

RooDataSet *	_genData
	! Data being generated

bool	_isValid
	Is context in valid state?

Int_t	_nextProtoIndex
	Next prototype event to load according to LUT.

TString	_normRange
	Normalization range of pdf.

std::vector< Int_t >	_protoOrder
	LUT with traversal order of prototype data.

const RooDataSet *	_prototype
	Pointer to prototype dataset.

RooArgSet	_protoVars
	Prototype observables.

RooArgSet	_theEvent
	Pointer to observable event being generated.

bool	_verbose
	Verbose messaging?

Protected Attributes inherited from TNamed
TString	fName

TString	fTitle

Additional Inherited Members
Public Types inherited from TObject
enum	{ kIsOnHeap = 0x01000000 , kNotDeleted = 0x02000000 , kZombie = 0x04000000 , kInconsistent = 0x08000000 , kBitMask = 0x00ffffff }

enum	{ kSingleKey = (1ULL << ( 0 )) , kOverwrite = (1ULL << ( 1 )) , kWriteDelete = (1ULL << ( 2 )) }

enum	EDeprecatedStatusBits { kObjInCanvas = (1ULL << ( 3 )) }

enum	EStatusBits { kCanDelete = (1ULL << ( 0 )) , kMustCleanup = (1ULL << ( 3 )) , kIsReferenced = (1ULL << ( 4 )) , kHasUUID = (1ULL << ( 5 )) , kCannotPick = (1ULL << ( 6 )) , kNoContextMenu = (1ULL << ( 8 )) , kInvalidObject = (1ULL << ( 13 )) }

Public Types inherited from RooPrintable
enum	ContentsOption { kName =1 , kClassName =2 , kValue =4 , kArgs =8 , kExtras =16 , kAddress =32 , kTitle =64 , kCollectionHeader =128 }

enum	StyleOption { kInline =1 , kSingleLine =2 , kStandard =3 , kVerbose =4 , kTreeStructure =5 }

Protected Types inherited from TObject
enum	{ kOnlyPrepStep = (1ULL << ( 3 )) }

Static Protected Attributes inherited from RooPrintable
static Int_t	_nameLength

#include <RooGenContext.h>

Inheritance diagram for RooGenContext:

[legend]

Constructor & Destructor Documentation

◆ RooGenContext()

RooGenContext::RooGenContext	(	const RooAbsPdf &	model,
		const RooArgSet &	vars,
		const RooDataSet *	prototype = `nullptr`,
		const RooArgSet *	auxProto = `nullptr`,
		bool	verbose = `false`,
		const RooArgSet *	forceDirect = `nullptr`
	)

Initialize a new context for generating events with the specified variables, using the specified PDF model.

A prototype dataset (if provided) is not cloned and still belongs to the caller. The contents and shape of this dataset can be changed between calls to generate() as long as the expected columns to be copied to the generated dataset are present. Any argument supplied in the forceDirect RooArgSet are always offered for internal generation to the p.d.f., even if this is deemed unsafe by the logic of RooGenContext.

Definition at line 64 of file RooGenContext.cxx.

◆ ~RooGenContext()

RooGenContext::~RooGenContext ( )

override

Destructor.

Definition at line 310 of file RooGenContext.cxx.

Member Function Documentation

◆ attach()

void RooGenContext::attach ( const RooArgSet & params )

overridevirtual

Attach the cloned model to the event buffer we will be filling.

Reimplemented from RooAbsGenContext.

Definition at line 322 of file RooGenContext.cxx.

◆ Class()

static TClass * RooGenContext::Class ( )

static

Returns: TClass describing this class

◆ Class_Name()

static const char * RooGenContext::Class_Name ( )

static

Returns: Name of this class

◆ Class_Version()

static constexpr Version_t RooGenContext::Class_Version ( )

inlinestaticconstexpr

Returns: Version of this class

Definition at line 55 of file RooGenContext.h.

◆ DeclFileName()

static const char * RooGenContext::DeclFileName ( )

inlinestatic

Returns: Name of the file containing the class declaration

Definition at line 55 of file RooGenContext.h.

◆ generateEvent()

void RooGenContext::generateEvent	(	RooArgSet &	theEvent,
		Int_t	remaining
	)

overrideprotectedvirtual

Generate one event.

The 'remaining' integer is not used other than for printing messages

Implements RooAbsGenContext.

Definition at line 364 of file RooGenContext.cxx.

◆ initGenerator()

void RooGenContext::initGenerator ( const RooArgSet & theEvent )

overrideprotectedvirtual

Perform one-time initialization of the generator context.

Reimplemented from RooAbsGenContext.

Definition at line 341 of file RooGenContext.cxx.

◆ IsA()

TClass * RooGenContext::IsA ( ) const

inlineoverridevirtual

Returns: TClass describing current object

Reimplemented from RooAbsGenContext.

Definition at line 55 of file RooGenContext.h.

◆ printMultiline()

void RooGenContext::printMultiline	(	std::ostream &	os,
		Int_t	content,
		bool	verbose = `false`,
		TString	indent = `""`
	)		const

overridevirtual

Printing interface.

Reimplemented from RooAbsGenContext.

Definition at line 416 of file RooGenContext.cxx.

◆ Streamer()

void RooGenContext::Streamer ( TBuffer & R__b )

overridevirtual

Stream an object of class TObject.

Reimplemented from RooAbsGenContext.

◆ StreamerNVirtual()

void RooGenContext::StreamerNVirtual ( TBuffer & ClassDef_StreamerNVirtual_b )

inline

Definition at line 55 of file RooGenContext.h.

Member Data Documentation

◆ _acceptRejectFunc

std::unique_ptr<RooRealIntegral> RooGenContext::_acceptRejectFunc

protected

Projection function to be passed to accept/reject sampler.

Definition at line 50 of file RooGenContext.h.

◆ _area

double RooGenContext::_area {0.}

protected

Definition at line 49 of file RooGenContext.h.

◆ _cloneSet

RooArgSet RooGenContext::_cloneSet

protected

Clone of all nodes of input p.d.f.

Definition at line 45 of file RooGenContext.h.

◆ _code

Int_t RooGenContext::_code

protected

Internal generation code.

Definition at line 48 of file RooGenContext.h.

◆ _directVars

RooArgSet RooGenContext::_directVars

protected

Definition at line 47 of file RooGenContext.h.

◆ _generator

RooAbsNumGenerator* RooGenContext::_generator

protected

MC sampling generation engine.

Definition at line 51 of file RooGenContext.h.

◆ _maxProb

double RooGenContext::_maxProb {0.}

protected

Definition at line 49 of file RooGenContext.h.

◆ _maxVar

RooRealVar* RooGenContext::_maxVar

protected

Variable holding maximum value of p.d.f.

Definition at line 52 of file RooGenContext.h.

◆ _norm

double RooGenContext::_norm {0.}

protected

Maximum probability, p.d.f area and normalization.

Definition at line 49 of file RooGenContext.h.

◆ _otherVars

RooArgSet RooGenContext::_otherVars

protected

List of observables generated internally, randomly, and by accept/reject sampling.

Definition at line 47 of file RooGenContext.h.

◆ _pdfClone

RooAbsPdf* RooGenContext::_pdfClone

protected

Clone of input p.d.f.

Definition at line 46 of file RooGenContext.h.

◆ _uniformVars

RooArgSet RooGenContext::_uniformVars

protected

Definition at line 47 of file RooGenContext.h.

◆ _updateFMaxPerEvent

Int_t RooGenContext::_updateFMaxPerEvent

protected

If true, maximum p.d.f value needs to be recalculated for each event.

Definition at line 53 of file RooGenContext.h.

Libraries for RooGenContext:

[legend]

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

roofit/roofitcore/inc/RooGenContext.h
roofit/roofitcore/src/RooGenContext.cxx

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Constructor & Destructor Documentation

◆ RooGenContext()

◆ ~RooGenContext()

Member Function Documentation

◆ attach()

◆ Class()

◆ Class_Name()

◆ Class_Version()

◆ DeclFileName()

◆ generateEvent()

◆ initGenerator()

◆ IsA()

◆ printMultiline()

◆ Streamer()

◆ StreamerNVirtual()

Member Data Documentation

◆ _acceptRejectFunc

◆ _area

◆ _cloneSet

◆ _code

◆ _directVars

◆ _generator

◆ _maxProb

◆ _maxVar

◆ _norm

◆ _otherVars

◆ _pdfClone

◆ _uniformVars

◆ _updateFMaxPerEvent