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RooFoamGenerator.h
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1 /*****************************************************************************
2  * Project: RooFit *
3  * Package: RooFitCore *
4  * File: $Id$
5  * Authors: *
6  * WV, Wouter Verkerke, UC Santa Barbara, verkerke@slac.stanford.edu *
7  * DK, David Kirkby, UC Irvine, dkirkby@uci.edu *
8  * *
9  * Copyright (c) 2000-2005, Regents of the University of California *
10  * and Stanford University. All rights reserved. *
11  * *
12  * Redistribution and use in source and binary forms, *
13  * with or without modification, are permitted according to the terms *
14  * listed in LICENSE (http://roofit.sourceforge.net/license.txt) *
15  *****************************************************************************/
16 #ifndef ROO_FOAM_GENERATOR
17 #define ROO_FOAM_GENERATOR
18 
19 #include "RooAbsNumGenerator.h"
20 #include "RooPrintable.h"
21 #include "RooArgSet.h"
22 
23 class RooAbsReal;
24 class RooRealVar;
25 class RooDataSet;
26 
27 class TFoam ;
28 class RooTFoamBinding ;
29 class RooNumGenFactory ;
30 
32 public:
33  RooFoamGenerator() : _binding(0), _tfoam(0), _xmin(0), _range(0), _vec(0) {} ;
34  RooFoamGenerator(const RooAbsReal &func, const RooArgSet &genVars, const RooNumGenConfig& config, Bool_t verbose=kFALSE, const RooAbsReal* maxFuncVal=0);
35  RooAbsNumGenerator* clone(const RooAbsReal& func, const RooArgSet& genVars, const RooArgSet& /*condVars*/,
36  const RooNumGenConfig& config, Bool_t verbose=kFALSE, const RooAbsReal* maxFuncVal=0) const {
37  return new RooFoamGenerator(func,genVars,config,verbose,maxFuncVal) ;
38  }
39  virtual ~RooFoamGenerator();
40 
41  const RooArgSet *generateEvent(UInt_t remaining, Double_t& resampleRatio);
42 
43  TFoam& engine() { return *_tfoam; }
44 
45  virtual Bool_t canSampleConditional() const { return kFALSE ; }
46  virtual Bool_t canSampleCategories() const { return kFALSE ; }
47 
48 protected:
49 
50  friend class RooNumGenFactory ;
51  static void registerSampler(RooNumGenFactory& fact) ;
52 
53  RooTFoamBinding* _binding ; // Binding of RooAbsReal to TFoam function interface
54  TFoam* _tfoam ; // Instance of TFOAM generator
55  Double_t* _xmin ; // Lower bound of observables to be generated ;
56  Double_t* _range ; // Range of observables to be generated ;
57  Double_t* _vec ; // Transfer array for FOAM output
58 
59 
60  ClassDef(RooFoamGenerator,0) // Context for generating a dataset from a PDF using the TFoam class
61 };
62 
63 #endif
RooAbsNumGenerator * clone(const RooAbsReal &func, const RooArgSet &genVars, const RooArgSet &, const RooNumGenConfig &config, Bool_t verbose=kFALSE, const RooAbsReal *maxFuncVal=0) const
virtual Bool_t canSampleCategories() const
RooArgSet is a container object that can hold multiple RooAbsArg objects.
Definition: RooArgSet.h:28
const RooArgSet * generateEvent(UInt_t remaining, Double_t &resampleRatio)
are we actually generating anything? (the cache always contains at least our function value) ...
RooTFoamBinding * _binding
virtual Bool_t canSampleConditional() const
Class RooFoamGenerator is a generic toy monte carlo generator that implement the TFOAM sampling techn...
virtual ~RooFoamGenerator()
Destructor.
#define ClassDef(name, id)
Definition: Rtypes.h:322
RooRealVar represents a variable that can be changed from the outside.
Definition: RooRealVar.h:35
unsigned int UInt_t
Definition: RtypesCore.h:44
Class RooAbsNumGenerator is the abstract base class for MC event generator implementations like RooAc...
static void registerSampler(RooNumGenFactory &fact)
Register RooIntegrator1D, is parameters and capabilities with RooNumIntFactory.
RooDataSet is a container class to hold unbinned data.
Definition: RooDataSet.h:33
const Bool_t kFALSE
Definition: RtypesCore.h:90
RooAbsReal is the common abstract base class for objects that represent a real value and implements f...
Definition: RooAbsReal.h:60
Lightweight interface adaptor that binds a RooAbsPdf to TFOAM.
RooNumGenConfig holds the configuration parameters of the various numeric integrators used by RooReal...
RooNumGenFactory is a factory to instantiate numeric integrators from a given function binding and a ...
TFoam is the main class of the multi-dimensional general purpose Monte Carlo event generator (integra...
Definition: TFoam.h:21