ROOT_528-00b_version: include/RooGamma.h Source File

00001 /*****************************************************************************
00002  * Project: RooFit                                                           *
00003  * Package: RooFitModels
00004  *
00005  * authors: Stefan A. Schmitz, Gregory Schott
00006  * implementation of the Gamma distribution (class structure derived 
00007  * from the class RooGaussian by Wouter Verkerke and David Kirkby)  
00008  *
00009  * Redistribution and use in source and binary forms,                        *
00010  * with or without modification, are permitted according to the terms        *
00011  * listed in LICENSE (http://roofit.sourceforge.net/license.txt)             *
00012  *****************************************************************************/
00013 
00014 #ifndef ROO_GAMMA
00015 #define ROO_GAMMA
00016 
00017 #include "RooAbsPdf.h"
00018 #include "RooRealProxy.h"
00019 
00020 class RooRealVar;
00021 
00022 class RooGamma : public RooAbsPdf {
00023 public:
00024   RooGamma() {} ;
00025   RooGamma(const char *name, const char *title,
00026               RooAbsReal& _x, RooAbsReal& _gamma, RooAbsReal& _beta, RooAbsReal& _mu);
00027   RooGamma(const RooGamma& other, const char* name=0) ;
00028   virtual TObject* clone(const char* newname) const { return new RooGamma(*this,newname); }
00029   inline virtual ~RooGamma() { }
00030 
00031   Int_t getAnalyticalIntegral(RooArgSet& allVars, RooArgSet& analVars, const char* rangeName=0) const ;
00032   Double_t analyticalIntegral(Int_t code, const char* rangeName=0) const ;
00033 
00034   Int_t getGenerator(const RooArgSet& directVars, RooArgSet &generateVars, Bool_t staticInitOK=kTRUE) const;
00035   void generateEvent(Int_t code);
00036 
00037 protected:
00038 
00039   RooRealProxy x ;
00040   RooRealProxy gamma ;
00041   RooRealProxy beta ;
00042   RooRealProxy mu ;
00043   
00044   Double_t evaluate() const ;
00045 
00046 private:
00047 
00048   ClassDef(RooGamma,1) // Gaussian PDF
00049 };
00050 
00051 #endif