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:

// 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 30 of file PdfProposal.h.

Public Member Functions
	PdfProposal ()
	By default, PdfProposal does NOT own the PDF that serves as the proposal density function.

	PdfProposal (RooAbsPdf &pdf)
	By default, PdfProposal does NOT own the PDF that serves as the proposal density function.

virtual	~PdfProposal ()

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

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

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

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.

virtual void	printMappings ()

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

virtual void	Reset ()

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.

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.

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

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

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.

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	Clear (Option_t *="")

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

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

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

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
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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=0)
	Execute method on this object with the given parameter string, e.g.

virtual void	Execute (TMethod method, TObjArray params, Int_t *error=0)
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	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
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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 const char *	GetName () const
	Returns 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 const char *	GetTitle () const
	Returns title of object.

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.

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

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.

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	Returns kTRUE if object inherits from class "classname".

virtual Bool_t	InheritsFrom (const TClass *cl) const
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virtual void	Inspect () const
	Dump contents of this object in a graphics canvas.

void	InvertBit (UInt_t f)

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

virtual Bool_t	IsSortable () const

R__ALWAYS_INLINE Bool_t	IsZombie () const

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

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)
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void	operator delete[] (void *ptr)
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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)
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virtual void	Paint (Option_t *option="")
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virtual void	Pop ()
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virtual void	Print (Option_t *option="") const
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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.

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=0, Int_t option=0, Int_t bufsize=0)
	Write this object to the current directory.

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

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

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
RooDataSet *	fCache
	our position in the cached proposal data set

Int_t	fCachePosition
	how many points to generate each time

Int_t	fCacheSize
	the last point we were at

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

RooArgSet	fLastX
	pdf iterator

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

RooArgSet	fMaster
	the cached proposal data set

Bool_t	fOwnsPdf
	pointers to master variables needed for updates

RooAbsPdf *	fPdf

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

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

enum	EDeprecatedStatusBits { kObjInCanvas = BIT(3) }

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

Static Public Member Functions inherited from TObject
static Long_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.

Protected Types inherited from TObject
enum	{ kOnlyPrepStep = BIT(3) }

#include <RooStats/PdfProposal.h>

Inheritance diagram for RooStats::PdfProposal:

[legend]

Constructor & Destructor Documentation

◆ PdfProposal() [1/2]

PdfProposal::PdfProposal ( )

By default, PdfProposal does NOT own the PDF that serves as the proposal density function.

Definition at line 75 of file PdfProposal.cxx.

◆ PdfProposal() [2/2]

PdfProposal::PdfProposal ( RooAbsPdf & pdf )

By default, PdfProposal does NOT own the PDF that serves as the proposal density function.

Definition at line 88 of file PdfProposal.cxx.

◆ ~PdfProposal()

virtual RooStats::PdfProposal::~PdfProposal ( )

inlinevirtual

Definition at line 96 of file PdfProposal.h.

Member Function Documentation

◆ AddMapping()

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 200 of file PdfProposal.cxx.

◆ Equals()

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 100 of file PdfProposal.cxx.

◆ GetPdf()

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

inlinevirtual

Get the PDF is the proposal density function.

Definition at line 52 of file PdfProposal.h.

◆ GetProposalDensity()

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 180 of file PdfProposal.cxx.

◆ IsSymmetric()

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 170 of file PdfProposal.cxx.

◆ printMappings()

virtual void RooStats::PdfProposal::printMappings ( )

inlinevirtual

Definition at line 71 of file PdfProposal.h.

◆ Propose()

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

virtual

Populate xPrime with a new proposed point.

Implements RooStats::ProposalFunction.

Definition at line 119 of file PdfProposal.cxx.

◆ Reset()

virtual void RooStats::PdfProposal::Reset ( )

inlinevirtual

Definition at line 63 of file PdfProposal.h.

◆ SetCacheSize()

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 80 of file PdfProposal.h.

◆ SetOwnsPdf()

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 91 of file PdfProposal.h.

◆ SetPdf()

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

inlinevirtual

Set the PDF to be the proposal density function.

Definition at line 49 of file PdfProposal.h.

Member Data Documentation

◆ fCache

RooDataSet* RooStats::PdfProposal::fCache

protected

our position in the cached proposal data set

Definition at line 110 of file PdfProposal.h.

◆ fCachePosition

Int_t RooStats::PdfProposal::fCachePosition

protected

how many points to generate each time

Definition at line 109 of file PdfProposal.h.

◆ fCacheSize

Int_t RooStats::PdfProposal::fCacheSize

protected

the last point we were at

Definition at line 108 of file PdfProposal.h.

◆ fIt

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

protected

map of values in pdf to update

Definition at line 106 of file PdfProposal.h.

◆ fLastX

RooArgSet RooStats::PdfProposal::fLastX

protected

pdf iterator

Definition at line 107 of file PdfProposal.h.

◆ fMap

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

protected

the proposal density function

Definition at line 105 of file PdfProposal.h.

◆ fMaster

RooArgSet RooStats::PdfProposal::fMaster

protected

the cached proposal data set

Definition at line 111 of file PdfProposal.h.

◆ fOwnsPdf

Bool_t RooStats::PdfProposal::fOwnsPdf

protected

pointers to master variables needed for updates

Definition at line 112 of file PdfProposal.h.

◆ fPdf

RooAbsPdf* RooStats::PdfProposal::fPdf

protected

Definition at line 104 of file PdfProposal.h.

Libraries 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

◆ PdfProposal() [1/2]

◆ PdfProposal() [2/2]

◆ ~PdfProposal()

Member Function Documentation

◆ AddMapping()

◆ Equals()

◆ GetPdf()

◆ GetProposalDensity()

◆ IsSymmetric()

◆ printMappings()

◆ Propose()

◆ Reset()

◆ SetCacheSize()

◆ SetOwnsPdf()

◆ SetPdf()

Member Data Documentation

◆ fCache

◆ fCachePosition

◆ fCacheSize

◆ fIt

◆ fLastX

◆ fMap

◆ fMaster

◆ fOwnsPdf

◆ fPdf