#ifndef ROO_MC_INTEGRATOR
#define ROO_MC_INTEGRATOR
#include "RooAbsIntegrator.h"
#include "RooGrid.h"
#include "RooNumIntConfig.h"
#include "TStopwatch.h"
class RooMCIntegrator : public RooAbsIntegrator {
public:
enum SamplingMode { Importance, ImportanceOnly, Stratified };
enum GeneratorType { QuasiRandom, PseudoRandom };
RooMCIntegrator() ;
RooMCIntegrator(const RooAbsFunc& function, SamplingMode mode= Importance,
GeneratorType genType= QuasiRandom, Bool_t verbose= kFALSE);
RooMCIntegrator(const RooAbsFunc& function, const RooNumIntConfig& config);
virtual RooAbsIntegrator* clone(const RooAbsFunc& function, const RooNumIntConfig& config) const ;
virtual ~RooMCIntegrator();
virtual Bool_t checkLimits() const;
virtual Double_t integral(const Double_t* yvec=0);
enum Stage { AllStages, ReuseGrid, RefineGrid };
Double_t vegas(Stage stage, UInt_t calls, UInt_t iterations, Double_t *absError= 0);
Double_t getAlpha() const { return _alpha; }
void setAlpha(Double_t alpha) { _alpha= alpha; }
GeneratorType getGenType() const { return _genType; }
void setGenType(GeneratorType type) { _genType= type; }
const RooGrid &grid() const { return _grid; }
virtual Bool_t canIntegrate1D() const { return kTRUE ; }
virtual Bool_t canIntegrate2D() const { return kTRUE ; }
virtual Bool_t canIntegrateND() const { return kTRUE ; }
virtual Bool_t canIntegrateOpenEnded() const { return kFALSE ; }
protected:
friend class RooNumIntFactory ;
static void registerIntegrator(RooNumIntFactory& fact) ;
mutable RooGrid _grid;
Bool_t _verbose;
Double_t _alpha;
Int_t _mode;
GeneratorType _genType;
Int_t _nRefineIter ;
Int_t _nRefinePerDim ;
Int_t _nIntegratePerDim ;
TStopwatch _timer;
Double_t _jac,_wtd_int_sum,_sum_wgts,_chi_sum,_chisq,_result,_sigma;
UInt_t _it_start,_it_num,_samples,_calls_per_box;
ClassDef(RooMCIntegrator,0)
};
#endif
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