rf404_categories.C File Reference

Detailed Description

Data and categories: working with RooCategory objects to describe discrete variables

 
 
␛[1mRooFit v3.60 -- Developed by Wouter Verkerke and David Kirkby␛[0m 
                Copyright (C) 2000-2013 NIKHEF, University of California & Stanford University
                All rights reserved, please read http://roofit.sourceforge.net/license.txt
 
RooCategory::tagCat = Lepton(idx = 0)
 
RooCategory::b0flav = B0(idx = -1)
 
Roo1DTable::b0flav = (B0=5058,B0bar=4942)
 
  Table b0flav : pData
  +-------+------+
  |    B0 | 5058 |
  | B0bar | 4942 |
  +-------+------+
 
Roo1DTable::tagCat = (Lepton=454,Kaon=450,NetTagger-1=432,NetTagger-2=429)
 
  Table tagCat : pData(x>8.23)
  +-------------+-----+
  |      Lepton | 454 |
  |        Kaon | 450 |
  | NetTagger-1 | 432 |
  | NetTagger-2 | 429 |
  +-------------+-----+
 
 
  Table (tagCat x b0flav) : pData
  +---------------------+------+
  |         {Lepton;B0} | 1302 |
  |           {Kaon;B0} | 1232 |
  |    {NetTagger-1;B0} | 1242 |
  |    {NetTagger-2;B0} | 1282 |
  |      {Lepton;B0bar} | 1192 |
  |        {Kaon;B0bar} | 1314 |
  | {NetTagger-1;B0bar} | 1208 |
  | {NetTagger-2;B0bar} | 1228 |
  +---------------------+------+
 
Number of events with B0 flavor is 5058
Fraction of events tagged with Lepton tag is 0.257224
 
  Table tagCat : pData
  +-------------+------+
  |      Lepton | 2494 |
  |        Kaon | 2546 |
  | NetTagger-1 |    0 |
  | NetTagger-2 |    0 |
  +-------------+------+
 

 
#include "RooRealVar.h"
#include "RooDataSet.h"
#include "RooPolynomial.h"
#include "RooCategory.h"
#include "Roo1DTable.h"
#include "RooGaussian.h"
#include "RooConstVar.h"
#include "TCanvas.h"
#include "TAxis.h"
#include "RooPlot.h"
using namespace RooFit;
 
void rf404_categories()
{
 
   // C o n s t r u c t    a   c a t e g o r y   w i t h   l a b e l s
   // ----------------------------------------------------------------
 
   // Define a category with labels only
   RooCategory tagCat("tagCat", "Tagging category");
   tagCat.defineType("Lepton");
   tagCat.defineType("Kaon");
   tagCat.defineType("NetTagger-1");
   tagCat.defineType("NetTagger-2");
   tagCat.Print();
 
   // C o n s t r u c t    a   c a t e g o r y   w i t h   l a b e l s   a n d   i n d e c e s
   // ----------------------------------------------------------------------------------------
 
   // Define a category with explicitly numbered states
   RooCategory b0flav("b0flav", "B0 flavour eigenstate");
   b0flav.defineType("B0", -1);
   b0flav.defineType("B0bar", 1);
   b0flav.Print();
 
   // G e n e r a t e   d u m m y   d a t a  f o r   t a b u l a t i o n   d e m o
   // ----------------------------------------------------------------------------
 
   // Generate a dummy dataset
   RooRealVar x("x", "x", 0, 10);
   RooDataSet *data = RooPolynomial("p", "p", x).generate(RooArgSet(x, b0flav, tagCat), 10000);
 
   // P r i n t   t a b l e s   o f   c a t e g o r y   c o n t e n t s   o f   d a t a s e t s
   // ------------------------------------------------------------------------------------------
 
   // Tables are equivalent of plots for categories
   Roo1DTable *btable = data->table(b0flav);
   btable->Print();
   btable->Print("v");
 
   // Create table for subset of events matching cut expression
   Roo1DTable *ttable = data->table(tagCat, "x>8.23");
   ttable->Print();
   ttable->Print("v");
 
   // Create table for all (tagCat x b0flav) state combinations
   Roo1DTable *bttable = data->table(RooArgSet(tagCat, b0flav));
   bttable->Print("v");
 
   // Retrieve number of events from table
   // Number can be non-integer if source dataset has weighed events
   Double_t nb0 = btable->get("B0");
   cout << "Number of events with B0 flavor is " << nb0 << endl;
 
   // Retrieve fraction of events with "Lepton" tag
   Double_t fracLep = ttable->getFrac("Lepton");
   cout << "Fraction of events tagged with Lepton tag is " << fracLep << endl;
 
   // D e f i n i n g   r a n g e s   f o r   p l o t t i n g ,   f i t t i n g   o n   c a t e g o r i e s
   // ------------------------------------------------------------------------------------------------------
 
   // Define named range as comma separated list of labels
   tagCat.setRange("good", "Lepton,Kaon");
 
   // Or add state names one by one
   tagCat.addToRange("soso", "NetTagger-1");
   tagCat.addToRange("soso", "NetTagger-2");
 
   // Use category range in dataset reduction specification
   RooDataSet *goodData = (RooDataSet *)data->reduce(CutRange("good"));
   goodData->table(tagCat)->Print("v");
}

Author

07/2008 - Wouter Verkerke

Definition in file rf404_categories.C.