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 "RooAddPdf.h"
#include "RooExponential.h"
#include "TCanvas.h"
#include "TAxis.h"
#include "RooPlot.h"
using namespace RooFit;
 
void rf206_treevistools()
{
   // 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
}

 
[#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.
0x7ffec5e81f50 RooAddPdf::model = 0.582695/1 [Auto,Clean] 
  0x7ffec5e81060/V- RooAddPdf::bkg = 0.16539/1 [Auto,Clean] 
    0x7ffec5e7e6f8/V- RooChebychev::bkg1 = 0.8 [Auto,Dirty] 
      0x7ffec5e81780/V- RooRealVar::x = 5
      0x7ffec5e7fcd8/V- RooRealVar::a0 = 0.5
      0x7ffec5e800c0/V- RooRealVar::a1 = 0.2
    0x7ffec5e80890/V- RooRealVar::bkg1frac = 0.2
    0x7ffec5e7ec28/V- RooExponential::bkg2 = 0.00673795 [Auto,Dirty] 
      0x7ffec5e81780/V- RooRealVar::x = 5
      0x7ffec5e804a8/V- RooRealVar::alpha = -1
  0x7ffec5e81b68/V- RooRealVar::bkgfrac = 0.5
  0x7ffec5e7d528/V- RooAddPdf::sig = 1/1 [Auto,Clean] 
    0x7ffec5e7dc48/V- RooGaussian::sig1 = 1 [Auto,Dirty] 
      0x7ffec5e81780/V- RooRealVar::x = 5
      0x7ffec5e80c78/V- RooRealVar::mean = 5
      0x7ffec5e7f120/V- RooRealVar::sigma1 = 0.5
    0x7ffec5e7f8f0/V- RooRealVar::sig1frac = 0.8
    0x7ffec5e7e1a0/V- RooGaussian::sig2 = 1 [Auto,Dirty] 
      0x7ffec5e81780/V- RooRealVar::x = 5
      0x7ffec5e80c78/V- RooRealVar::mean = 5
      0x7ffec5e7f508/V- RooRealVar::sigma2 = 1

Date

July 2008

Author

Wouter Verkerke

Definition in file rf206_treevistools.C.