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RooLegendre.h
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1 /*****************************************************************************
2  * Project: RooFit *
3  * Package: RooFitModels *
4  * File: $Id$
5  * Authors: *
6  * GR, Gerhard Raven, Nikhef & VU, Gerhard.Raven@nikhef.nl
7  * *
8  * Copyright (c) 2010, Nikhef & VU. All rights reserved.
9  * *
10  * Redistribution and use in source and binary forms, *
11  * with or without modification, are permitted according to the terms *
12  * listed in LICENSE (http://roofit.sourceforge.net/license.txt) *
13  *****************************************************************************/
14 #ifndef ROO_LEGENDRE
15 #define ROO_LEGENDRE
16 
17 #include "RooAbsReal.h"
18 #include "RooRealProxy.h"
19 
20 class RooLegendre : public RooAbsReal {
21 public:
22  RooLegendre() ;
23  // an (associated) Legendre polynomial, P_l^m(x)
24  // note: P_l(x) == P_l^0(x)
25  RooLegendre(const char *name, const char *title, RooAbsReal& ctheta, int l, int m=0);
26  // product of two associated Legendre polynomials, P_l1^m1(ctheta) * P_l2^m2(ctheta)
27  RooLegendre(const char *name, const char *title, RooAbsReal& ctheta, int l1, int m1, int l2, int m2);
28 
29  RooLegendre(const RooLegendre& other, const char* name = 0);
30  virtual TObject* clone(const char* newname) const { return new RooLegendre(*this, newname); }
31  inline virtual ~RooLegendre() { }
32 
33  virtual Int_t getAnalyticalIntegral(RooArgSet& allVars, RooArgSet& analVars, const char* rangeName=0) const ;
34  virtual Double_t analyticalIntegral(Int_t code, const char* rangeName=0) const ;
35 
36  virtual Int_t getMaxVal( const RooArgSet& vars) const;
37  virtual Double_t maxVal( Int_t code) const;
38 
39 protected: // allow RooSpHarmonic access...
41  int _l1,_m1;
42  int _l2,_m2;
43 
44  Double_t evaluate() const;
45 
46  ClassDef(RooLegendre,1) // Legendre polynomial
47 };
48 
49 #endif
virtual Int_t getAnalyticalIntegral(RooArgSet &allVars, RooArgSet &analVars, const char *rangeName=0) const
Interface function getAnalyticalIntergral advertises the analytical integrals that are supported...
virtual Int_t getMaxVal(const RooArgSet &vars) const
Advertise capability to determine maximum value of function for given set of observables.
RooRealProxy _ctheta
Definition: RooLegendre.h:40
int Int_t
Definition: RtypesCore.h:41
virtual Double_t analyticalIntegral(Int_t code, const char *rangeName=0) const
this was verified to match mathematica for l1 in [0,2], m1 in [0,l1], l2 in [l1,4], m2 in [0,l2]
virtual TObject * clone(const char *newname) const
Definition: RooLegendre.h:30
virtual Double_t maxVal(Int_t code) const
Return maximum value for set of observables identified by code assigned in getMaxVal.
#define ClassDef(name, id)
Definition: Rtypes.h:254
TLine l1(2.5, 4.5, 15.5, 4.5)
virtual ~RooLegendre()
Definition: RooLegendre.h:31
TPaveLabel title(3, 27.1, 15, 28.7,"ROOT Environment and Tools")
TMarker * m
Definition: textangle.C:8
TLine * l
Definition: textangle.C:4
double Double_t
Definition: RtypesCore.h:55
RooAbsReal is the common abstract base class for objects that represent a real value and implements f...
Definition: RooAbsReal.h:53
#define name(a, b)
Definition: linkTestLib0.cpp:5
Mother of all ROOT objects.
Definition: TObject.h:58
Double_t evaluate() const
TODO: check that 0<=m_i<=l_i; on the other hand, assoc_legendre already does that ;-) Note: P_0^0 = 1...
Definition: RooLegendre.cxx:94
RooRealProxy is the concrete proxy for RooAbsReal objects A RooRealProxy is the general mechanism to ...
Definition: RooRealProxy.h:23