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Reference Guide
rf512_wsfactory_oper.C
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1 /// \file
2 /// \ingroup tutorial_roofit
3 /// \notebook -nodraw
4 /// 'ORGANIZATION AND SIMULTANEOUS FITS' RooFit tutorial macro #512
5 ///
6 /// Illustration of operator expressions and expression-based
7 /// basic p.d.f.s in the workspace factory syntax
8 ///
9 /// \macro_output
10 /// \macro_code
11 /// \author 04/2009 - Wouter Verkerke
12 
13 
14 #include "RooRealVar.h"
15 #include "RooDataSet.h"
16 #include "RooGaussian.h"
17 #include "RooConstVar.h"
18 #include "RooChebychev.h"
19 #include "RooAddPdf.h"
20 #include "RooWorkspace.h"
21 #include "RooPlot.h"
22 #include "TCanvas.h"
23 #include "TAxis.h"
24 using namespace RooFit ;
25 
26 
27 void rf512_wsfactory_oper()
28 {
29  RooWorkspace* w = new RooWorkspace("w") ;
30 
31  // You can define typedefs for even shorter construction semantics
32  w->factory("$Typedef(Gaussian,Gaus)") ;
33  w->factory("$Typedef(Chebychev,Cheby)") ;
34 
35 
36  // O p e r a t o r p . d . f . e x a m p l e s
37  // ------------------------------------------------
38 
39  // PDF addition is done with SUM (coef1*pdf1,pdf2)
40  w->factory("SUM::summodel( f[0,1]*Gaussian::gx(x[-10,10],m[0],1.0), Chebychev::ch(x,{0.1,0.2,-0.3}) )") ;
41 
42 
43  // Extended PDF addition is done with SUM (yield1*pdf1,yield2*pdf2)
44  w->factory("SUM::extsummodel( Nsig[0,1000]*gx, Nbkg[0,1000]*ch )") ;
45 
46 
47  // PDF multiplication is done with PROD ( pdf1, pdf2 )
48  w->factory("PROD::gxz( gx, Gaussian::gz(z[-10,10],0,1) )") ;
49 
50 
51  // Conditional p.d.f multiplication is done with PROD ( pdf1|obs, pdf2 )
52  w->factory("Gaussian::gy( y[-10,10], x, 1.0 )") ;
53  w->factory("PROD::gxycond( gy|x, gx )") ;
54 
55 
56  // Convolution (numeric/ fft) is done with NCONV/FCONV (obs,pdf1,pdf2)
57  w->factory("FCONV::lxg( x, Gaussian::g(x,mg[0],1), Landau::lc(x,0,1) )") ;
58 
59 
60  // Simultaneous p.d.f.s are constructed with SIMUL( index, state1=pdf1, state2=pdf2,...)
61  w->factory("SIMUL::smodel( c[A=0,B=1], A=Gaussian::gs(x,m,s[1]), B=Landau::ls(x,0,1) )") ;
62 
63 
64 
65 
66  // O p e r a t o r f u n c t i o n e x a m p l e s
67  // ---------------------------------------------------
68 
69  // Function multiplication is done with prod (func1, func2,...)
70  w->factory("prod::uv(u[10],v[10])") ;
71 
72 
73  // Function addition is done with sum(func1,func2)
74  w->factory("sum::uv2(u,v)") ;
75 
76 
77 
78  // I n t e r p r e t e d a n d c o m p i l e d e x p r e s s i o n b a s e d p . d . f . s .
79  // ---------------------------------------------------------------------------------------------------
80 
81  // Create a RooGenericPdf interpreted p.d.f. You can use single quotes to pass the expression string argument
82  w->factory("EXPR::G('x*x+1',x)") ;
83 
84  // Create a custom compiled p.d.f similar to the above interpreted p.d.f.
85  // The code required to make this p.d.f. is automatically embedded in the workspace
86  w->factory("CEXPR::GC('x*x+a',{x,a[1]})") ;
87 
88 
89  // Compiled and interpreted functions (rather than p.d.f.s) can be made with the lower case
90  // 'expr' and 'cexpr' types
91 
92  // Print workspace contents
93  w->Print() ;
94 
95  // Make workspace visible on command line
96  gDirectory->Add(w) ;
97 }
98 
99 
RooFactoryWSTool & factory()
Return instance to factory tool.
#define gDirectory
Definition: TDirectory.h:221
void Print(Option_t *opts=0) const
Print contents of the workspace.
The RooWorkspace is a persistable container for RooFit projects.
Definition: RooWorkspace.h:42