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Reference Guide
RooStats::PdfProposal Class Reference

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 36 of file PdfProposal.h.

Public Member Functions

 PdfProposal ()
 By default, PdfProposal does NOT own the PDF that serves as the proposal density function. More...
 
 PdfProposal (RooAbsPdf &pdf)
 By default, PdfProposal does NOT own the PDF that serves as the proposal density function. More...
 
virtual ~PdfProposal ()
 
virtual void AddMapping (RooRealVar &proposalParam, RooAbsReal &update)
 specify a mapping between a parameter of the proposal function and a parameter of interest. More...
 
virtual const RooAbsPdfGetPdf () const
 Get the PDF is the proposal density function. More...
 
virtual Double_t GetProposalDensity (RooArgSet &x1, RooArgSet &x2)
 Return the probability of proposing the point x1 given the starting point x2. 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 void printMappings ()
 
virtual void Propose (RooArgSet &xPrime, RooArgSet &x)
 Populate xPrime with a new proposed point. More...
 
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. 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 void SetPdf (RooAbsPdf &pdf)
 Set the PDF to be the proposal density function. More...
 
- 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 constructor. More...
 
 TObject (const TObject &object)
 TObject copy ctor. More...
 
virtual ~TObject ()
 TObject destructor. 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...
 
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...
 
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. More...
 
virtual const char * ClassName () const
 Returns name of class to which the object belongs. More...
 
virtual void Clear (Option_t *="")
 
virtual TObjectClone (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 TObjectDrawClone (Option_t *option="") const
 Draw a clone of this object in the current selected pad for instance with: gROOT->SetSelectedPad(gPad). More...
 
virtual void Dump () const
 Dump contents of object on stdout. More...
 
virtual void Error (const char *method, const char *msgfmt,...) const
 Issue error message. 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 void Fatal (const char *method, const char *msgfmt,...) const
 Issue fatal error message. More...
 
virtual TObjectFindObject (const char *name) const
 Must be redefined in derived classes. More...
 
virtual TObjectFindObject (const TObject *obj) const
 Must be redefined in derived classes. More...
 
virtual Option_tGetDrawOption () const
 Get option used by the graphics system to draw this object. More...
 
virtual const char * GetIconName () const
 Returns mime type name of object. More...
 
virtual const char * GetName () const
 Returns name of object. More...
 
virtual char * GetObjectInfo (Int_t px, Int_t py) const
 Returns string containing info about the object at position (px,py). More...
 
virtual Option_tGetOption () const
 
virtual const char * GetTitle () const
 Returns title of object. More...
 
virtual UInt_t GetUniqueID () const
 Return the unique object id. 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...
 
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. More...
 
virtual void Info (const char *method, const char *msgfmt,...) const
 Issue info message. 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...
 
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). More...
 
virtual Bool_t IsFolder () const
 Returns kTRUE in case object contains browsable objects (like containers or lists of other objects). More...
 
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. 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...
 
virtual Bool_t Notify ()
 This method must be overridden to handle object notification. More...
 
void Obsolete (const char *method, const char *asOfVers, const char *removedFromVers) const
 Use this method to declare a method obsolete. More...
 
void operator delete (void *ptr)
 Operator delete. More...
 
void operator delete[] (void *ptr)
 Operator delete []. More...
 
voidoperator new (size_t sz)
 
voidoperator new (size_t sz, void *vp)
 
voidoperator new[] (size_t sz)
 
voidoperator new[] (size_t sz, void *vp)
 
TObjectoperator= (const TObject &rhs)
 TObject assignment operator. 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...
 
void ResetBit (UInt_t f)
 
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...
 
void SetBit (UInt_t f)
 
void SetBit (UInt_t f, Bool_t set)
 Set or unset the user status bits as specified in f. 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 SysError (const char *method, const char *msgfmt,...) const
 Issue system error message. More...
 
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. More...
 
virtual void Warning (const char *method, const char *msgfmt,...) const
 Issue warning message. 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...
 

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

Protected Attributes

RooDataSetfCache
 our position in the cached proposal data set More...
 
Int_t fCachePosition
 how many points to generate each time More...
 
Int_t fCacheSize
 the last point we were at More...
 
std::map< RooRealVar *, RooAbsReal * >::iterator fIt
 map of values in pdf to update More...
 
RooArgSet fLastX
 pdf iterator More...
 
std::map< RooRealVar *, RooAbsReal * > fMap
 the proposal density function More...
 
RooArgSet fMaster
 the cached proposal data set More...
 
Bool_t fOwnsPdf
 pointers to master variables needed for updates More...
 
RooAbsPdffPdf
 

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. More...
 
static Bool_t GetObjectStat ()
 Get status of object stat flag. More...
 
static void SetDtorOnly (void *obj)
 Set destructor only 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() [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 108 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 64 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 83 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 75 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 92 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 103 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 61 of file PdfProposal.h.

Member Data Documentation

◆ fCache

RooDataSet* RooStats::PdfProposal::fCache
protected

our position in the cached proposal data set

Definition at line 122 of file PdfProposal.h.

◆ fCachePosition

Int_t RooStats::PdfProposal::fCachePosition
protected

how many points to generate each time

Definition at line 121 of file PdfProposal.h.

◆ fCacheSize

Int_t RooStats::PdfProposal::fCacheSize
protected

the last point we were at

Definition at line 120 of file PdfProposal.h.

◆ fIt

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

map of values in pdf to update

Definition at line 118 of file PdfProposal.h.

◆ fLastX

RooArgSet RooStats::PdfProposal::fLastX
protected

pdf iterator

Definition at line 119 of file PdfProposal.h.

◆ fMap

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

the proposal density function

Definition at line 117 of file PdfProposal.h.

◆ fMaster

RooArgSet RooStats::PdfProposal::fMaster
protected

the cached proposal data set

Definition at line 123 of file PdfProposal.h.

◆ fOwnsPdf

Bool_t RooStats::PdfProposal::fOwnsPdf
protected

pointers to master variables needed for updates

Definition at line 124 of file PdfProposal.h.

◆ fPdf

RooAbsPdf* RooStats::PdfProposal::fPdf
protected

Definition at line 116 of file PdfProposal.h.

Libraries for RooStats::PdfProposal:
[legend]

The documentation for this class was generated from the following files:
RooGaussian
Definition: RooGaussian.h:25
RooStats::PdfProposal::PdfProposal
PdfProposal()
By default, PdfProposal does NOT own the PDF that serves as the proposal density function.
Definition: PdfProposal.cxx:75
sigma
const Double_t sigma
Definition: h1analysisProxy.h:11
RooRealVar
Definition: RooRealVar.h:36