1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15 //_________________________________________________________________________
16 // A test analysis task to check the pt of tracks distribution in simulated data
19 //////////////////////////////////////////////////////////////////////////////
27 #include "AliAnalysisTaskPt.h"
31 //________________________________________________________________________
32 AliAnalysisTaskPt::AliAnalysisTaskPt(const char *name) :
33 AliAnalysisTask(name,""),
38 // Input slot #0 works with an Ntuple
39 DefineInput(0, TChain::Class());
40 // Output slot #0 writes into a TH1 container
41 DefineOutput(0, TObjArray::Class());
44 //________________________________________________________________________
45 void AliAnalysisTaskPt::Init(Option_t *)
47 // Initialisation of branch container and histograms
49 AliInfo(Form("*** Initialization of %s", GetName())) ;
52 fChain = dynamic_cast<TChain *>(GetInputData(0)) ;
54 AliError(Form("Input 0 for %s not found\n", GetName()));
59 // One should first check if the branch address was taken by some other task
60 char ** address = (char **)GetBranchAddress(0, "ESD") ;
62 fESD = (AliESD *)(*address) ;
64 fChain->SetBranchAddress("ESD", &fESD) ;
66 // The output objects will be written to
67 TDirectory * cdir = gDirectory ;
68 // Open a file for output #0
69 char outputName[1024] ;
70 sprintf(outputName, "%s.root", GetName() ) ;
71 OpenFile(0, outputName , "RECREATE") ;
77 fhPt = new TH1F("fhPt","This is the Pt distribution",15,0.1,3.1);
78 fhPt->SetStats(kTRUE);
79 fhPt->GetXaxis()->SetTitle("P_{T} [GeV]");
80 fhPt->GetYaxis()->SetTitle("#frac{dN}{dP_{T}}");
81 fhPt->GetXaxis()->SetTitleColor(1);
82 fhPt->SetMarkerStyle(kFullCircle);
84 // create output container
86 fOutputContainer = new TObjArray(1) ;
87 fOutputContainer->SetName(GetName()) ;
89 fOutputContainer->AddAt(fhPt, 0) ;
92 //________________________________________________________________________
93 void AliAnalysisTaskPt::Exec(Option_t *)
95 // Processing of one event
97 Long64_t entry = fChain->GetReadEntry() ;
100 AliError("fESD is not connected to the input!") ;
104 if ( !((entry-1)%100) )
105 AliInfo(Form("%s ----> Processing event # %lld", (dynamic_cast<TChain *>(fChain))->GetFile()->GetName(), entry)) ;
107 //************************ Pt tracks *************************************
109 for(Int_t iTracks = 0; iTracks < fESD->GetNumberOfTracks(); iTracks++) {
110 AliESDtrack * ESDTrack = fESD->GetTrack(iTracks);
111 Double_t momentum[3];
112 ESDTrack->GetPxPyPz(momentum);
113 Double_t Pt = sqrt(pow(momentum[0],2) + pow(momentum[1],2));
117 PostData(0, fOutputContainer);
120 //________________________________________________________________________
121 void AliAnalysisTaskPt::Terminate(Option_t *)
123 // Processing when the event loop is ended
125 TCanvas *c1 = new TCanvas("c1","Pt",10,10,310,310);
126 c1->SetFillColor(10);
127 c1->SetHighLightColor(10);
129 c1->cd(1)->SetLeftMargin(0.15);
130 c1->cd(1)->SetBottomMargin(0.15);
131 c1->cd(1)->SetLogy();
134 c1->Print("TracksPt.eps");
137 sprintf(line, ".!tar -zcvf %s.tar.gz *.eps", GetName()) ;
138 gROOT->ProcessLine(line);
139 sprintf(line, ".!rm -fR *.eps");
140 gROOT->ProcessLine(line);
142 AliInfo(Form("!!! All the eps files are in %s.tar.gz !!! \n", GetName())) ;