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2 * Project: RooFit *
3 * Package: RooFitModels
4 *
5 * authors: Stefan A. Schmitz, Gregory Schott
6 * implementation of the Gamma distribution (class structure derived
7 * from the class RooGaussian by Wouter Verkerke and David Kirkby)
8 *
9 * Redistribution and use in source and binary forms, *
10 * with or without modification, are permitted according to the terms *
11 * listed in LICENSE (http://roofit.sourceforge.net/license.txt) *
12 *****************************************************************************/
14#ifndef ROO_GAMMA
15#define ROO_GAMMA
17#include "RooAbsPdf.h"
18#include "RooRealProxy.h"
20class RooGamma : public RooAbsPdf {
22 RooGamma() {} ;
23 RooGamma(const char *name, const char *title,
24 RooAbsReal& _x, RooAbsReal& _gamma, RooAbsReal& _beta, RooAbsReal& _mu);
25 RooGamma(const RooGamma& other, const char* name=nullptr) ;
26 TObject* clone(const char* newname) const override { return new RooGamma(*this,newname); }
28 Int_t getAnalyticalIntegral(RooArgSet& allVars, RooArgSet& analVars, const char* rangeName=nullptr) const override ;
29 double analyticalIntegral(Int_t code, const char* rangeName=nullptr) const override ;
31 Int_t getGenerator(const RooArgSet& directVars, RooArgSet &generateVars, bool staticInitOK=true) const override;
32 void generateEvent(Int_t code) override;
34 void translate(RooFit::Detail::CodeSquashContext &ctx) const override;
35 std::string
36 buildCallToAnalyticIntegral(Int_t code, const char *rangeName, RooFit::Detail::CodeSquashContext &ctx) const override;
45 double evaluate() const override ;
46 void computeBatch(double* output, size_t nEvents, RooFit::Detail::DataMap const&) const override;
47 inline bool canComputeBatchWithCuda() const override { return true; }
51 ClassDefOverride(RooGamma,1) // Gaussian PDF
#define ClassDefOverride(name, id)
Definition Rtypes.h:341
char name[80]
Definition TGX11.cxx:110
Abstract interface for all probability density functions.
Definition RooAbsPdf.h:40
Abstract base class for objects that represent a real value and implements functionality common to al...
Definition RooAbsReal.h:59
RooArgSet is a container object that can hold multiple RooAbsArg objects.
Definition RooArgSet.h:55
A class to maintain the context for squashing of RooFit models into code.
Implementation of the Gamma PDF for RooFit/RooStats.
Definition RooGamma.h:20
std::string buildCallToAnalyticIntegral(Int_t code, const char *rangeName, RooFit::Detail::CodeSquashContext &ctx) const override
This function defines the analytical integral translation for the class.
Definition RooGamma.cxx:122
RooRealProxy beta
Definition RooGamma.h:42
Int_t getGenerator(const RooArgSet &directVars, RooArgSet &generateVars, bool staticInitOK=true) const override
Load generatedVars with the subset of directVars that we can generate events for, and return a code t...
Definition RooGamma.cxx:166
TObject * clone(const char *newname) const override
Definition RooGamma.h:26
Definition RooGamma.h:22
double analyticalIntegral(Int_t code, const char *rangeName=nullptr) const override
Implements the actual analytical integral(s) advertised by getAnalyticalIntegral.
Definition RooGamma.cxx:113
double evaluate() const override
Evaluate this PDF / function / constant. Needs to be overridden by all derived classes.
Definition RooGamma.cxx:83
RooRealProxy x
Definition RooGamma.h:40
void translate(RooFit::Detail::CodeSquashContext &ctx) const override
This function defines a translation for each RooAbsReal based object that can be used to express the ...
Definition RooGamma.cxx:90
void generateEvent(Int_t code) override
algorithm adapted from code example in: Marsaglia, G.
Definition RooGamma.cxx:182
RooRealProxy gamma
Definition RooGamma.h:41
RooRealProxy mu
Definition RooGamma.h:43
void computeBatch(double *output, size_t nEvents, RooFit::Detail::DataMap const &) const override
Compute multiple values of Gamma PDF.
Definition RooGamma.cxx:97
bool canComputeBatchWithCuda() const override
Definition RooGamma.h:47
Int_t getAnalyticalIntegral(RooArgSet &allVars, RooArgSet &analVars, const char *rangeName=nullptr) const override
Interface function getAnalyticalIntergral advertises the analytical integrals that are supported.
Definition RooGamma.cxx:105
Mother of all ROOT objects.
Definition TObject.h:41
static void output()