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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: operator expressions and expression-based basic p.d.f.s in the workspace factory
5/// syntax
6///
7/// \macro_output
8/// \macro_code
9/// \author 04/2009 - Wouter Verkerke
10
11#include "RooRealVar.h"
12#include "RooDataSet.h"
13#include "RooGaussian.h"
14#include "RooConstVar.h"
15#include "RooChebychev.h"
16#include "RooAddPdf.h"
17#include "RooWorkspace.h"
18#include "RooPlot.h"
19#include "TCanvas.h"
20#include "TAxis.h"
21using namespace RooFit;
22
23void rf512_wsfactory_oper()
24{
25 RooWorkspace *w = new RooWorkspace("w");
26
27 // You can define typedefs for even shorter construction semantics
28 w->factory("$Typedef(Gaussian,Gaus)");
29 w->factory("$Typedef(Chebychev,Cheby)");
30
31 // O p e r a t o r p . d . f . e x a m p l e s
32 // ------------------------------------------------
33
34 // PDF addition is done with SUM (coef1*pdf1,pdf2)
35 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}) )");
36
37 // Extended PDF addition is done with SUM (yield1*pdf1,yield2*pdf2)
38 w->factory("SUM::extsummodel( Nsig[0,1000]*gx, Nbkg[0,1000]*ch )");
39
40 // PDF multiplication is done with PROD ( pdf1, pdf2 )
41 w->factory("PROD::gxz( gx, Gaussian::gz(z[-10,10],0,1) )");
42
43 // Conditional p.d.f multiplication is done with PROD ( pdf1|obs, pdf2 )
44 w->factory("Gaussian::gy( y[-10,10], x, 1.0 )");
45 w->factory("PROD::gxycond( gy|x, gx )");
46
47 // Convolution (numeric/ fft) is done with NCONV/FCONV (obs,pdf1,pdf2)
48 w->factory("FCONV::lxg( x, Gaussian::g(x,mg[0],1), Landau::lc(x,0,1) )");
49
50 // Simultaneous p.d.f.s are constructed with SIMUL( index, state1=pdf1, state2=pdf2,...)
51 w->factory("SIMUL::smodel( c[A=0,B=1], A=Gaussian::gs(x,m,s[1]), B=Landau::ls(x,0,1) )");
52
53 // O p e r a t o r f u n c t i o n e x a m p l e s
54 // ---------------------------------------------------
55
56 // Function multiplication is done with prod (func1, func2,...)
57 w->factory("prod::uv(u[10],v[10])");
58
59 // Function addition is done with sum(func1,func2)
60 w->factory("sum::uv2(u,v)");
61
62 // 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 .
63 // ---------------------------------------------------------------------------------------------------
64
65 // Create a RooGenericPdf interpreted p.d.f. You can use single quotes to pass the expression string argument
66 w->factory("EXPR::G('x*x+1',x)");
67
68 // Create a custom compiled p.d.f similar to the above interpreted p.d.f.
69 // The code required to make this p.d.f. is automatically embedded in the workspace
70 w->factory("CEXPR::GC('x*x+a',{x,a[1]})");
71
72 // Compiled and interpreted functions (rather than p.d.f.s) can be made with the lower case
73 // 'expr' and 'cexpr' types
74
75 // Print workspace contents
76 w->Print();
77
78 // Make workspace visible on command line
79 gDirectory->Add(w);
80}
#define gDirectory
Definition: TDirectory.h:218
The RooWorkspace is a persistable container for RooFit projects.
Definition: RooWorkspace.h:43
void Print(Option_t *opts=0) const
Print contents of the workspace.
RooFactoryWSTool & factory()
Return instance to factory tool.
Template specialisation used in RooAbsArg: