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RooSegmentedIntegrator1D.h
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1 /*****************************************************************************
2  * Project: RooFit *
3  * Package: RooFitCore *
4  * File: $Id: RooSegmentedIntegrator1D.h,v 1.7 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_SEGMENTED_INTEGRATOR_1D
17 #define ROO_SEGMENTED_INTEGRATOR_1D
18 
19 #include "RooAbsIntegrator.h"
20 #include "RooIntegrator1D.h"
21 #include "RooNumIntConfig.h"
22 
23 class RooSegmentedIntegrator1D : public RooAbsIntegrator {
24 public:
25 
26  // Constructors, assignment etc
27  RooSegmentedIntegrator1D() ;
28  RooSegmentedIntegrator1D(const RooAbsFunc& function, const RooNumIntConfig& config) ;
29  RooSegmentedIntegrator1D(const RooAbsFunc& function, Double_t xmin, Double_t xmax, const RooNumIntConfig& config) ;
30 
31  virtual RooAbsIntegrator* clone(const RooAbsFunc& function, const RooNumIntConfig& config) const ;
32  virtual ~RooSegmentedIntegrator1D();
33 
34  virtual Bool_t checkLimits() const;
35  virtual Double_t integral(const Double_t *yvec=0) ;
36 
37  using RooAbsIntegrator::setLimits ;
38  Bool_t setLimits(Double_t *xmin, Double_t *xmax);
39  virtual Bool_t setUseIntegrandLimits(Bool_t flag) { _useIntegrandLimits = flag ; return kTRUE ; }
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 kFALSE ; }
45 
46 protected:
47 
48  friend class RooNumIntFactory ;
49  static void registerIntegrator(RooNumIntFactory& fact) ;
50 
51  mutable Double_t _xmin ;
52  mutable Double_t _xmax ;
53  mutable Double_t _range ;
54  Bool_t _valid ;
55  Int_t _nseg ; // Number of segments
56  Bool_t _useIntegrandLimits ;
57 
58  RooNumIntConfig _config ;
59  RooIntegrator1D** _array ; // Array of segment integrators
60 
61  Bool_t initialize();
62 
63  ClassDef(RooSegmentedIntegrator1D,0) // 1-dimensional piece-wise numerical integration engine
64 };
65 
66 #endif