rf206_treevistools.C File Reference

Detailed Description

'ADDITION AND CONVOLUTION' RooFit tutorial macro #206

Tools for visualization of RooAbsArg expression trees

Processing /builddir/build/BUILD/root-6.10.08/tutorials/roofit/rf206_treevistools.C...

RooFit v3.60 -- Developed by Wouter Verkerke and David Kirkby 
                Copyright (C) 2000-2013 NIKHEF, University of California & Stanford University
                All rights reserved, please read http://roofit.sourceforge.net/license.txt

0xbef2dfa0 RooAddPdf::model = 0.582695 [Auto,Dirty] 
  0xbef2e6d8/V- RooAddPdf::bkg = 0.16539 [Auto,Dirty] 
    0xbef2f3c8/V- RooChebychev::bkg1 = 0.8 [Auto,Dirty] 
      0xbef31218/V- RooRealVar::x = 5
      0xbef2f9c0/V- RooRealVar::a0 = 0.5
      0xbef2f728/V- RooRealVar::a1 = 0.2
    0xbef2eb78/V- RooRealVar::bkg1frac = 0.2
    0xbef2ee10/V- RooExponential::bkg2 = 0.00673795 [Auto,Dirty] 
      0xbef31218/V- RooRealVar::x = 5
      0xbef2f130/V- RooRealVar::alpha = -1
  0xbef2e440/V- RooRealVar::bkgfrac = 0.5
  0xbef2fc58/V- RooAddPdf::sig = 1 [Auto,Dirty] 
    0xbef306f0/V- RooGaussian::sig1 = 1 [Auto,Dirty] 
      0xbef31218/V- RooRealVar::x = 5
      0xbef30f80/V- RooRealVar::mean = 5
      0xbef30ce8/V- RooRealVar::sigma1 = 0.5
    0xbef300f8/V- RooRealVar::sig1frac = 0.8
    0xbef30390/V- RooGaussian::sig2 = 1 [Auto,Dirty] 
      0xbef31218/V- RooRealVar::x = 5
      0xbef30f80/V- RooRealVar::mean = 5
      0xbef30a50/V- RooRealVar::sigma2 = 1

#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 p.d.f.
   RooRealVar sig1frac("sig1frac","fraction of component 1 in signal",0.8,0.,1.) ;
   RooAddPdf sig("sig","Signal",RooArgList(sig1,sig2),sig1frac) ;

   // Build Chebychev polynomial p.d.f.  
   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 p.d.f.
   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

}

Author

07/2008 - Wouter Verkerke

Definition in file rf206_treevistools.C.