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RooImproperIntegrator1D.h
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1 /*****************************************************************************
2  * Project: RooFit *
3  * Package: RooFitCore *
4  * File: $Id: RooImproperIntegrator1D.h,v 1.12 2007/05/11 09:11:30 verkerke Exp $
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_IMPROPER_INTEGRATOR_1D
17 #define ROO_IMPROPER_INTEGRATOR_1D
18 
19 #include "RooAbsIntegrator.h"
20 #include "RooNumIntConfig.h"
21 
22 class RooInvTransform;
23 class RooIntegrator1D;
24 
25 class RooImproperIntegrator1D : public RooAbsIntegrator {
26 public:
27 
28  RooImproperIntegrator1D() ;
29  RooImproperIntegrator1D(const RooAbsFunc& function);
30  RooImproperIntegrator1D(const RooAbsFunc& function, const RooNumIntConfig& config);
31  RooImproperIntegrator1D(const RooAbsFunc& function, Double_t xmin, Double_t xmax, const RooNumIntConfig& config);
32  virtual RooAbsIntegrator* clone(const RooAbsFunc& function, const RooNumIntConfig& config) const ;
33  virtual ~RooImproperIntegrator1D();
34 
35  virtual Bool_t checkLimits() const;
36  using RooAbsIntegrator::setLimits ;
37  Bool_t setLimits(Double_t* xmin, Double_t* xmax);
38  virtual Bool_t setUseIntegrandLimits(Bool_t flag) {_useIntegrandLimits = flag ; return kTRUE ; }
39  virtual Double_t integral(const Double_t* yvec=0) ;
40 
41  virtual Bool_t canIntegrate1D() const { return kTRUE ; }
42  virtual Bool_t canIntegrate2D() const { return kFALSE ; }
43  virtual Bool_t canIntegrateND() const { return kFALSE ; }
44  virtual Bool_t canIntegrateOpenEnded() const { return kTRUE ; }
45 
46 protected:
47 
48  friend class RooNumIntFactory ;
49  static void registerIntegrator(RooNumIntFactory& fact) ;
50 
51  void initialize(const RooAbsFunc* function=0) ;
52 
53  enum LimitsCase { Invalid, ClosedBothEnds, OpenBothEnds, OpenBelowSpansZero, OpenBelow,
54  OpenAboveSpansZero, OpenAbove };
55  LimitsCase limitsCase() const;
56  LimitsCase _case; // Configuration of limits
57  mutable Double_t _xmin, _xmax; // Value of limits
58  Bool_t _useIntegrandLimits; // Use limits in function binding?
59 
60  RooAbsFunc* _origFunc ; // Original function binding
61  RooInvTransform *_function; // Binding with inverse of function
62  RooNumIntConfig _config ; // Configuration object
63  mutable RooIntegrator1D *_integrator1,*_integrator2,*_integrator3; // Piece integrators
64 
65  ClassDef(RooImproperIntegrator1D,0) // 1-dimensional improper integration engine
66 };
67 
68 #endif