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rf206_treevistools.C File Reference

## Detailed Description

Addition and convolution: tools for visualization of RooAbsArg expression trees

#include "RooRealVar.h"
#include "RooDataSet.h"
#include "RooGaussian.h"
#include "RooChebychev.h"
#include "RooExponential.h"
#include "TCanvas.h"
#include "TAxis.h"
#include "RooPlot.h"
using namespace RooFit;
{
// S e t u p c o m p o s i t e p d f
// --------------------------------------
// Declare observable x
RooRealVar x("x", "x", 0, 10);
// Create two Gaussian PDFs g1(x,mean1,sigma) anf g2(x,mean2,sigma) and their parameters
RooRealVar mean("mean", "mean of gaussians", 5);
RooRealVar sigma1("sigma1", "width of gaussians", 0.5);
RooRealVar sigma2("sigma2", "width of gaussians", 1);
RooGaussian sig1("sig1", "Signal component 1", x, mean, sigma1);
RooGaussian sig2("sig2", "Signal component 2", x, mean, sigma2);
// Sum the signal components into a composite signal pdf
RooRealVar sig1frac("sig1frac", "fraction of component 1 in signal", 0.8, 0., 1.);
RooAddPdf sig("sig", "Signal", RooArgList(sig1, sig2), sig1frac);
// Build Chebychev polynomial pdf
RooRealVar a0("a0", "a0", 0.5, 0., 1.);
RooRealVar a1("a1", "a1", 0.2, 0., 1.);
RooChebychev bkg1("bkg1", "Background 1", x, RooArgSet(a0, a1));
// Build expontential pdf
RooRealVar alpha("alpha", "alpha", -1);
RooExponential bkg2("bkg2", "Background 2", x, alpha);
// Sum the background components into a composite background pdf
RooRealVar bkg1frac("bkg1frac", "fraction of component 1 in background", 0.2, 0., 1.);
RooAddPdf bkg("bkg", "Signal", RooArgList(bkg1, bkg2), bkg1frac);
// Sum the composite signal and background
RooRealVar bkgfrac("bkgfrac", "fraction of background", 0.5, 0., 1.);
RooAddPdf model("model", "g1+g2+a", RooArgList(bkg, sig), bkgfrac);
// 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
// -----------------------------------------------------------
// Print tree to stdout
model.Print("t");
// Print tree to file
model.printCompactTree("", "rf206_asciitree.txt");
// 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
// -------------------------------------------------------------
// Print GraphViz DOT file with representation of tree
model.graphVizTree("rf206_model.dot");
// Make graphic output file with one of the GraphViz tools
// (freely available from www.graphviz.org)
//
// 'Top-to-bottom graph'
// unix> dot -Tgif -o rf207_model_dot.gif rf207_model.dot
//
// 'Spring-model graph'
// unix> fdp -Tgif -o rf207_model_fdp.gif rf207_model.dot
}
Efficient implementation of a sum of PDFs of the form.
RooArgList is a container object that can hold multiple RooAbsArg objects.
Definition RooArgList.h:22
RooArgSet is a container object that can hold multiple RooAbsArg objects.
Definition RooArgSet.h:55
Chebychev polynomial p.d.f.
Exponential PDF.
Plain Gaussian p.d.f.
Definition RooGaussian.h:24
Variable that can be changed from the outside.
Definition RooRealVar.h:37
Double_t x[n]
Definition legend1.C:17
The namespace RooFit contains mostly switches that change the behaviour of functions of PDFs (or othe...
Definition JSONIO.h:26
[#0] WARNING:InputArguments -- The parameter 'sigma1' with range [-inf, inf] of the RooGaussian 'sig1' exceeds the safe range of (0, inf). Advise to limit its range.
[#0] WARNING:InputArguments -- The parameter 'sigma2' with range [-inf, inf] of the RooGaussian 'sig2' exceeds the safe range of (0, inf). Advise to limit its range.
0x7fffda518688/V- RooChebychev::bkg1 = 0.8 [Auto,Dirty]
0x7fffda51b710/V- RooRealVar::x = 5
0x7fffda519c68/V- RooRealVar::a0 = 0.5
0x7fffda51a050/V- RooRealVar::a1 = 0.2
0x7fffda51a820/V- RooRealVar::bkg1frac = 0.2
0x7fffda518bb8/V- RooExponential::bkg2 = 0.00673795 [Auto,Dirty]
0x7fffda51b710/V- RooRealVar::x = 5
0x7fffda51a438/V- RooRealVar::alpha = -1
0x7fffda51baf8/V- RooRealVar::bkgfrac = 0.5