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rf206_treevistools.C
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1 /// \file
2 /// \ingroup tutorial_roofit
3 /// \notebook -nodraw
4 /// Addition and convolution: tools for visualization of RooAbsArg expression trees
5 ///
6 /// \macro_output
7 /// \macro_code
8 ///
9 /// \date July 2008
10 /// \author Wouter Verkerke
11 
12 #include "RooRealVar.h"
13 #include "RooDataSet.h"
14 #include "RooGaussian.h"
15 #include "RooChebychev.h"
16 #include "RooAddPdf.h"
17 #include "RooExponential.h"
18 #include "TCanvas.h"
19 #include "TAxis.h"
20 #include "RooPlot.h"
21 using namespace RooFit;
22 
23 void rf206_treevistools()
24 {
25  // S e t u p c o m p o s i t e p d f
26  // --------------------------------------
27 
28  // Declare observable x
29  RooRealVar x("x", "x", 0, 10);
30 
31  // Create two Gaussian PDFs g1(x,mean1,sigma) anf g2(x,mean2,sigma) and their parameters
32  RooRealVar mean("mean", "mean of gaussians", 5);
33  RooRealVar sigma1("sigma1", "width of gaussians", 0.5);
34  RooRealVar sigma2("sigma2", "width of gaussians", 1);
35  RooGaussian sig1("sig1", "Signal component 1", x, mean, sigma1);
36  RooGaussian sig2("sig2", "Signal component 2", x, mean, sigma2);
37 
38  // Sum the signal components into a composite signal pdf
39  RooRealVar sig1frac("sig1frac", "fraction of component 1 in signal", 0.8, 0., 1.);
40  RooAddPdf sig("sig", "Signal", RooArgList(sig1, sig2), sig1frac);
41 
42  // Build Chebychev polynomial pdf
43  RooRealVar a0("a0", "a0", 0.5, 0., 1.);
44  RooRealVar a1("a1", "a1", 0.2, 0., 1.);
45  RooChebychev bkg1("bkg1", "Background 1", x, RooArgSet(a0, a1));
46 
47  // Build expontential pdf
48  RooRealVar alpha("alpha", "alpha", -1);
49  RooExponential bkg2("bkg2", "Background 2", x, alpha);
50 
51  // Sum the background components into a composite background pdf
52  RooRealVar bkg1frac("bkg1frac", "fraction of component 1 in background", 0.2, 0., 1.);
53  RooAddPdf bkg("bkg", "Signal", RooArgList(bkg1, bkg2), bkg1frac);
54 
55  // Sum the composite signal and background
56  RooRealVar bkgfrac("bkgfrac", "fraction of background", 0.5, 0., 1.);
57  RooAddPdf model("model", "g1+g2+a", RooArgList(bkg, sig), bkgfrac);
58 
59  // P r i n t c o m p o s i t e t r e e i n A S C I I
60  // -----------------------------------------------------------
61 
62  // Print tree to stdout
63  model.Print("t");
64 
65  // Print tree to file
66  model.printCompactTree("", "rf206_asciitree.txt");
67 
68  // D r a w c o m p o s i t e t r e e g r a p h i c a l l y
69  // -------------------------------------------------------------
70 
71  // Print GraphViz DOT file with representation of tree
72  model.graphVizTree("rf206_model.dot");
73 
74  // Make graphic output file with one of the GraphViz tools
75  // (freely available from www.graphviz.org)
76  //
77  // 'Top-to-bottom graph'
78  // unix> dot -Tgif -o rf207_model_dot.gif rf207_model.dot
79  //
80  // 'Spring-model graph'
81  // unix> fdp -Tgif -o rf207_model_fdp.gif rf207_model.dot
82 }
RooChebychev.h
RooAddPdf
RooAddPdf is an efficient implementation of a sum of PDFs of the form.
Definition: RooAddPdf.h:32
RooChebychev
Chebychev polynomial p.d.f.
Definition: RooChebychev.h:25
RooArgList
RooArgList is a container object that can hold multiple RooAbsArg objects.
Definition: RooArgList.h:21
RooGaussian.h
x
Double_t x[n]
Definition: legend1.C:17
RooGaussian
Plain Gaussian p.d.f.
Definition: RooGaussian.h:25
RooAddPdf.h
TCanvas.h
RooDataSet.h
rf206_treevistools
Definition: rf206_treevistools.py:1
RooFit
The namespace RooFit contains mostly switches that change the behaviour of functions of PDFs (or othe...
Definition: RooCFunction1Binding.h:29
RooPlot.h
RooRealVar.h
RooExponential.h
TAxis.h
make_cnn_model.model
model
Definition: make_cnn_model.py:6
RooRealVar
RooRealVar represents a variable that can be changed from the outside.
Definition: RooRealVar.h:37
RooExponential
Exponential PDF.
Definition: RooExponential.h:25
RooArgSet
RooArgSet is a container object that can hold multiple RooAbsArg objects.
Definition: RooArgSet.h:29