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1 /*****************************************************************************
2 * Project: RooFit *
3 * *
4 * Simple Poisson PDF
5 * author: Kyle Cranmer <cranmer@cern.ch>
6 * *
7 *****************************************************************************/
10#define ROOPOISSON
12#include "RooAbsPdf.h"
13#include "RooRealProxy.h"
14#include "RooCategoryProxy.h"
15#include "RooAbsReal.h"
16#include "RooAbsCategory.h"
17#include "RooTrace.h"
19class RooPoisson : public RooAbsPdf {
22 RooPoisson(const char *name, const char *title, RooAbsReal& _x, RooAbsReal& _mean, Bool_t noRounding=kFALSE);
23 RooPoisson(const RooPoisson& other, const char* name=0) ;
24 virtual TObject* clone(const char* newname) const override { return new RooPoisson(*this,newname); }
25 inline virtual ~RooPoisson() { }
27 Int_t getAnalyticalIntegral(RooArgSet& allVars, RooArgSet& analVars, const char* rangeName=0) const override;
28 Double_t analyticalIntegral(Int_t code, const char* rangeName=0) const override;
30 Int_t getGenerator(const RooArgSet& directVars, RooArgSet &generateVars, Bool_t staticInitOK=kTRUE) const override;
31 void generateEvent(Int_t code) override;
33 /// Switch off/on rounding of `x` to the nearest integer.
34 void setNoRounding(bool flag = kTRUE) {_noRounding = flag;}
35 /// Switch on or off protection against negative means.
36 void protectNegativeMean(bool flag = kTRUE) {_protectNegative = flag;}
45 Double_t evaluate() const override;
46 RooSpan<double> evaluateSpan(RooBatchCompute::RunContext& evalData, const RooArgSet* normSet) const override;
48 ClassDefOverride(RooPoisson,3) // A Poisson PDF
int Int_t
Definition: RtypesCore.h:45
const Bool_t kFALSE
Definition: RtypesCore.h:101
bool Bool_t
Definition: RtypesCore.h:63
double Double_t
Definition: RtypesCore.h:59
const Bool_t kTRUE
Definition: RtypesCore.h:100
#define ClassDefOverride(name, id)
Definition: Rtypes.h:329
char name[80]
Definition: TGX11.cxx:110
RooAbsReal is the common abstract base class for objects that represent a real value and implements f...
Definition: RooAbsReal.h:61
RooArgSet is a container object that can hold multiple RooAbsArg objects.
Definition: RooArgSet.h:35
Poisson pdf.
Definition: RooPoisson.h:19
RooRealProxy x
Definition: RooPoisson.h:40
Int_t getAnalyticalIntegral(RooArgSet &allVars, RooArgSet &analVars, const char *rangeName=0) const override
Interface function getAnalyticalIntergral advertises the analytical integrals that are supported.
Definition: RooPoisson.cxx:73
virtual ~RooPoisson()
Definition: RooPoisson.h:25
void protectNegativeMean(bool flag=kTRUE)
Switch on or off protection against negative means.
Definition: RooPoisson.h:36
Bool_t _protectNegative
Definition: RooPoisson.h:43
RooSpan< double > evaluateSpan(RooBatchCompute::RunContext &evalData, const RooArgSet *normSet) const override
Compute multiple values of the Poisson distribution.
Definition: RooPoisson.cxx:67
void generateEvent(Int_t code) override
Implement internal generator using TRandom::Poisson.
Definition: RooPoisson.cxx:153
Int_t getGenerator(const RooArgSet &directVars, RooArgSet &generateVars, Bool_t staticInitOK=kTRUE) const override
Advertise internal generator in x.
Definition: RooPoisson.cxx:144
Double_t analyticalIntegral(Int_t code, const char *rangeName=0) const override
Implements the actual analytical integral(s) advertised by getAnalyticalIntegral.
Definition: RooPoisson.cxx:82
virtual TObject * clone(const char *newname) const override
Definition: RooPoisson.h:24
Double_t evaluate() const override
Implementation in terms of the TMath::Poisson() function.
Definition: RooPoisson.cxx:54
Bool_t _noRounding
Definition: RooPoisson.h:42
RooRealProxy mean
Definition: RooPoisson.h:41
void setNoRounding(bool flag=kTRUE)
Switch off/on rounding of x to the nearest integer.
Definition: RooPoisson.h:34
A simple container to hold a batch of data values.
Definition: RooSpan.h:34
Mother of all ROOT objects.
Definition: TObject.h:37
This struct enables passing computation data around between elements of a computation graph.
Definition: RunContext.h:31