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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
20class RooLegendre : public RooAbsReal {
21public:
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
39protected: // allow RooSpHarmonic access...
41 int _l1,_m1;
42 int _l2,_m2;
43
44 Double_t evaluate() const;
45 RooSpan<double> evaluateBatch(std::size_t begin, std::size_t batchSize) const;
46
47 ClassDef(RooLegendre,1) // Legendre polynomial
48};
49
50#endif
int Int_t
Definition: RtypesCore.h:43
double Double_t
Definition: RtypesCore.h:57
#define ClassDef(name, id)
Definition: Rtypes.h:322
char name[80]
Definition: TGX11.cxx:109
RooAbsReal is the common abstract base class for objects that represent a real value and implements f...
Definition: RooAbsReal.h:60
RooArgSet is a container object that can hold multiple RooAbsArg objects.
Definition: RooArgSet.h:28
Compute the associated Legendre polynomials using ROOT::Math::assoc_legendre().
Definition: RooLegendre.h:20
RooSpan< double > evaluateBatch(std::size_t begin, std::size_t batchSize) const
Evaluate function for a batch of input data points.
virtual Int_t getAnalyticalIntegral(RooArgSet &allVars, RooArgSet &analVars, const char *rangeName=0) const
Interface function getAnalyticalIntergral advertises the analytical integrals that are supported.
Double_t evaluate() const
Note: P_0^0 = 1, so P_l^m = P_l^m P_0^0.
virtual ~RooLegendre()
Definition: RooLegendre.h:31
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],...
virtual Double_t maxVal(Int_t code) const
Return maximum value for set of observables identified by code assigned in getMaxVal.
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
virtual TObject * clone(const char *newname) const
Definition: RooLegendre.h:30
A simple container to hold a batch of data values.
Definition: RooSpan.h:32
Mother of all ROOT objects.
Definition: TObject.h:37
static constexpr double m2
auto * m
Definition: textangle.C:8
auto * l
Definition: textangle.C:4