PdfProposal is a concrete implementation of the ProposalFunction interface.

It proposes points across the parameter space in the distribution of the given PDF.

To make Propose(xPrime, x) dependent on x, configure with PdfProposal::AddMapping(varToUpdate, valueToUse). For example, suppose we have:

````{.cpp} our parameter RooRealVar p("p", "p", 5, 0, 10);

create mean and sigma for gaussian proposal function RooRealVar meanP("meanP", "meanP", 0, 10); RooRealVar sigma("sigma", "sigma", 1, 0, 5); RooGaussian pGaussian("pGaussian", "pGaussian", p, meanP, sigma);

configure proposal function PdfProposal pdfProposal(pGaussian); pdfProposal.AddMapping(meanP, p); // each call of Propose(xPrime, x), meanP in the proposal function will be updated to the value of p in x. this will center the proposal function about x's p when proposing for xPrime

To improve performance, PdfProposal has the ability to cache a specified number of proposals. If you don't call this function, the default cache size is 1, which can be slow. pdfProposal.SetCacheSize(desiredCacheSize); ````

PdfProposal currently uses a fixed cache size. Adaptive caching methods are in the works for future versions.

Definition at line 85 of file PdfProposal.h.

Public Member Functions
	PdfProposal ()

	PdfProposal (RooAbsPdf &pdf)

virtual void	Propose (RooArgSet &xPrime, RooArgSet &x)
	Populate xPrime with a new proposed point. More...

virtual Bool_t	IsSymmetric (RooArgSet &x1, RooArgSet &x2)
	Determine whether or not the proposal density is symmetric for points x1 and x2 - that is, whether the probabilty of reaching x2 from x1 is equal to the probability of reaching x1 from x2. More...

virtual Double_t	GetProposalDensity (RooArgSet &x1, RooArgSet &x2)
	Return the probability of proposing the point x1 given the starting point x2. More...

virtual void	SetPdf (RooAbsPdf &pdf)
	Set the PDF to be the proposal density function. More...

virtual const RooAbsPdf *	GetPdf () const
	Get the PDF is the proposal density function. More...

virtual void	AddMapping (RooRealVar &proposalParam, RooAbsReal &update)
	specify a mapping between a parameter of the proposal function and a parameter of interest. More...

virtual void	Reset ()

virtual void	printMappings ()

virtual void	SetCacheSize (Int_t size)
	Set how many points to generate each time we propose from a new point Default (and minimum) is 1. More...

virtual void	SetOwnsPdf (Bool_t ownsPdf)
	set whether we own the PDF that serves as the proposal density function By default, when constructed, PdfProposal does NOT own the PDF. More...

virtual	~PdfProposal ()

Public Member Functions inherited from RooStats::ProposalFunction
	ProposalFunction ()
	Default constructor. More...

virtual	~ProposalFunction ()

virtual bool	CheckParameters (RooArgSet &params)
	Check the parameters for which the ProposalFunction will propose values to make sure they are all RooRealVars Return true if all objects are RooRealVars, false otherwise. More...

Public Member Functions inherited from TObject
	TObject ()

	TObject (const TObject &object)
	TObject copy ctor. More...

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

virtual	~TObject ()
	TObject destructor. More...

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

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

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

virtual void	Clear (Option_t *="")

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

virtual Int_t	Compare (const TObject *obj) const
	Compare abstract method. More...

virtual void	Copy (TObject &object) const
	Copy this to obj. More...

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

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

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

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

virtual TObject *	DrawClone (Option_t *option="") const
	Draw a clone of this object in the current pad. More...

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

virtual void	Execute (const char method, const char params, Int_t *error=0)
	Execute method on this object with the given parameter string, e.g. More...

virtual void	Execute (TMethod method, TObjArray params, Int_t *error=0)
	Execute method on this object with parameters stored in the TObjArray. More...

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

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

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

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

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

virtual const char *	GetName () const
	Returns name of object. More...

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

virtual Option_t *	GetOption () const

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

virtual const char *	GetTitle () const
	Returns title of object. More...

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

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

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

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

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

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

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

virtual Bool_t	IsSortable () const

Bool_t	IsOnHeap () const

Bool_t	IsZombie () const

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

virtual void	ls (Option_t *option="") const
	The ls function lists the contents of a class on stdout. More...

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

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

virtual void	Print (Option_t *option="") const
	This method must be overridden when a class wants to print itself. More...

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

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

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

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

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

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

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

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

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

void *	operator new (size_t sz)

void *	operator new[] (size_t sz)

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

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

void	operator delete (void *ptr)
	Operator delete. More...

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

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

void	SetBit (UInt_t f)

void	ResetBit (UInt_t f)

Bool_t	TestBit (UInt_t f) const

Int_t	TestBits (UInt_t f) const

void	InvertBit (UInt_t f)

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

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

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

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

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

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

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). More...

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

Protected Member Functions
virtual Bool_t	Equals (RooArgSet &x1, RooArgSet &x2)
	whether we own the proposal density function More...

Protected Member Functions inherited from TObject
void	MakeZombie ()

virtual void	DoError (int level, const char location, const char fmt, va_list va) const
	Interface to ErrorHandler (protected). More...

Protected Attributes
RooAbsPdf *	fPdf

std::map< RooRealVar , RooAbsReal >	fMap
	the proposal density function More...

std::map< RooRealVar , RooAbsReal >::iterator	fIt
	map of values in pdf to update More...

RooArgSet	fLastX
	pdf iterator More...

Int_t	fCacheSize
	the last point we were at More...

Int_t	fCachePosition
	how many points to generate each time More...

RooDataSet *	fCache
	our position in the cached proposal data set More...

RooArgSet	fMaster
	the cached proposal data set More...

Bool_t	fOwnsPdf
	pointers to master variables needed for updates More...

Additional Inherited Members
Public Types inherited from TObject
enum	EStatusBits { kCanDelete = BIT(0), kMustCleanup = BIT(3), kObjInCanvas = BIT(3), kIsReferenced = BIT(4), kHasUUID = BIT(5), kCannotPick = BIT(6), kNoContextMenu = BIT(8), kInvalidObject = BIT(13) }

enum	{ kIsOnHeap = 0x01000000, kNotDeleted = 0x02000000, kZombie = 0x04000000, kBitMask = 0x00ffffff }

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

Static Public Member Functions inherited from TObject
static Long_t	GetDtorOnly ()
	Return destructor only flag. More...

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

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

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

#include <RooStats/PdfProposal.h>

Inheritance diagram for RooStats::PdfProposal:

[legend]

Constructor & Destructor Documentation

PdfProposal::PdfProposal ( )

Definition at line 55 of file PdfProposal.cxx.

PdfProposal::PdfProposal ( RooAbsPdf & pdf )

Definition at line 66 of file PdfProposal.cxx.

virtual RooStats::PdfProposal::~PdfProposal ( )

inlinevirtual

Definition at line 151 of file PdfProposal.h.

Member Function Documentation

void PdfProposal::AddMapping	(	RooRealVar &	proposalParam,
		RooAbsReal &	update
	)

virtual

specify a mapping between a parameter of the proposal function and a parameter of interest.

this mapping is used to set the value of proposalParam equal to the value of update to determine the proposal function. proposalParam is a parameter of the proposal function that must be set to the value of update (from the current point) in order to propose a new point.

Definition at line 160 of file PdfProposal.cxx.

Bool_t PdfProposal::Equals	(	RooArgSet &	x1,
		RooArgSet &	x2
	)

protectedvirtual

whether we own the proposal density function

determine whether these two RooArgSets represent the same point

Definition at line 75 of file PdfProposal.cxx.

Referenced by Propose().

virtual const RooAbsPdf* RooStats::PdfProposal::GetPdf ( ) const

inlinevirtual

Get the PDF is the proposal density function.

Definition at line 107 of file PdfProposal.h.

Double_t PdfProposal::GetProposalDensity	(	RooArgSet &	x1,
		RooArgSet &	x2
	)

virtual

Return the probability of proposing the point x1 given the starting point x2.

Implements RooStats::ProposalFunction.

Definition at line 149 of file PdfProposal.cxx.

Bool_t PdfProposal::IsSymmetric	(	RooArgSet &	x1,
		RooArgSet &	x2
	)

virtual

Determine whether or not the proposal density is symmetric for points x1 and x2 - that is, whether the probabilty of reaching x2 from x1 is equal to the probability of reaching x1 from x2.

Implements RooStats::ProposalFunction.

Definition at line 141 of file PdfProposal.cxx.

virtual void RooStats::PdfProposal::printMappings ( )

inlinevirtual

Definition at line 126 of file PdfProposal.h.

void PdfProposal::Propose	(	RooArgSet &	xPrime,
		RooArgSet &	x
	)

virtual

Populate xPrime with a new proposed point.

Implements RooStats::ProposalFunction.

Definition at line 92 of file PdfProposal.cxx.

virtual void RooStats::PdfProposal::Reset ( void )

inlinevirtual

Definition at line 118 of file PdfProposal.h.

virtual void RooStats::PdfProposal::SetCacheSize ( Int_t size )

inlinevirtual

Set how many points to generate each time we propose from a new point Default (and minimum) is 1.

Definition at line 135 of file PdfProposal.h.

virtual void RooStats::PdfProposal::SetOwnsPdf ( Bool_t ownsPdf )

inlinevirtual

set whether we own the PDF that serves as the proposal density function By default, when constructed, PdfProposal does NOT own the PDF.

Definition at line 146 of file PdfProposal.h.

virtual void RooStats::PdfProposal::SetPdf ( RooAbsPdf & pdf )

inlinevirtual

Set the PDF to be the proposal density function.

Definition at line 104 of file PdfProposal.h.

Member Data Documentation

RooDataSet* RooStats::PdfProposal::fCache

protected

our position in the cached proposal data set

Definition at line 165 of file PdfProposal.h.

Referenced by PdfProposal(), Propose(), Reset(), and ~PdfProposal().

Int_t RooStats::PdfProposal::fCachePosition

protected

how many points to generate each time

Definition at line 164 of file PdfProposal.h.

Referenced by PdfProposal(), Propose(), and Reset().

Int_t RooStats::PdfProposal::fCacheSize

protected

the last point we were at

Definition at line 163 of file PdfProposal.h.

Referenced by PdfProposal(), Propose(), and SetCacheSize().

std::map<RooRealVar*, RooAbsReal*>::iterator RooStats::PdfProposal::fIt

protected

map of values in pdf to update

Definition at line 161 of file PdfProposal.h.

Referenced by GetProposalDensity(), and Propose().

RooArgSet RooStats::PdfProposal::fLastX

protected

pdf iterator

Definition at line 162 of file PdfProposal.h.

Referenced by Propose(), and Reset().

std::map<RooRealVar*, RooAbsReal*> RooStats::PdfProposal::fMap

protected

the proposal density function

Definition at line 160 of file PdfProposal.h.

Referenced by AddMapping(), GetProposalDensity(), printMappings(), and Propose().

RooArgSet RooStats::PdfProposal::fMaster

protected

the cached proposal data set

Definition at line 166 of file PdfProposal.h.

Referenced by AddMapping(), GetProposalDensity(), and Propose().

Bool_t RooStats::PdfProposal::fOwnsPdf

protected

pointers to master variables needed for updates

Definition at line 167 of file PdfProposal.h.

Referenced by PdfProposal(), SetOwnsPdf(), and ~PdfProposal().

RooAbsPdf* RooStats::PdfProposal::fPdf

protected

Definition at line 159 of file PdfProposal.h.

Referenced by GetPdf(), GetProposalDensity(), PdfProposal(), Propose(), SetPdf(), and ~PdfProposal().

Collaboration diagram for RooStats::PdfProposal:

[legend]

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

roofit/roostats/inc/RooStats/PdfProposal.h
roofit/roostats/src/PdfProposal.cxx

Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation