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 **************************************************************************/
18 //_________________________________________________________________________
19 // A test analysis task to check the pt of tracks distribution in simulated data
22 //////////////////////////////////////////////////////////////////////////////
31 #include "AliAnalysisTaskPt.h"
35 //________________________________________________________________________
36 AliAnalysisTaskPt::AliAnalysisTaskPt(const char *name) :
37 AliAnalysisTask(name,""),
42 // Input slot #0 works with an Ntuple
43 DefineInput(0, TChain::Class());
44 // Output slot #0 writes into a TH1 container
45 DefineOutput(0, TObjArray::Class());
48 //________________________________________________________________________
49 void AliAnalysisTaskPt::Init(Option_t *)
51 // Initialisation of branch container and histograms
53 AliInfo(Form("*** Initialization of %s", GetName())) ;
56 fChain = dynamic_cast<TChain *>(GetInputData(0)) ;
58 AliError(Form("Input 0 for %s not found\n", GetName()));
63 // One should first check if the branch address was taken by some other task
64 char ** address = (char **)GetBranchAddress(0, "ESD") ;
66 fESD = (AliESD *)(*address) ;
68 fChain->SetBranchAddress("ESD", &fESD) ;
70 // The output objects will be written to
71 TDirectory * cdir = gDirectory ;
72 // Open a file for output #0
73 char outputName[1024] ;
74 sprintf(outputName, "%s.root", GetName() ) ;
75 OpenFile(0, outputName , "RECREATE") ;
81 fhPt = new TH1F("fhPt","This is the Pt distribution",15,0.1,3.1);
82 fhPt->SetStats(kTRUE);
83 fhPt->GetXaxis()->SetTitle("P_{T} [GeV]");
84 fhPt->GetYaxis()->SetTitle("#frac{dN}{dP_{T}}");
85 fhPt->GetXaxis()->SetTitleColor(1);
86 fhPt->SetMarkerStyle(kFullCircle);
88 // create output container
90 fOutputContainer = new TObjArray(1) ;
91 fOutputContainer->SetName(GetName()) ;
93 fOutputContainer->AddAt(fhPt, 0) ;
96 //________________________________________________________________________
97 void AliAnalysisTaskPt::Exec(Option_t *)
99 // Processing of one event
101 Long64_t entry = fChain->GetReadEntry() ;
104 AliError("fESD is not connected to the input!") ;
108 if ( !((entry-1)%100) )
109 AliInfo(Form("%s ----> Processing event # %lld", (dynamic_cast<TChain *>(fChain))->GetFile()->GetName(), entry)) ;
111 //************************ Pt tracks *************************************
113 for(Int_t iTracks = 0; iTracks < fESD->GetNumberOfTracks(); iTracks++) {
114 AliESDtrack * ESDTrack = fESD->GetTrack(iTracks);
115 Double_t momentum[3];
116 ESDTrack->GetPxPyPz(momentum);
117 Double_t Pt = sqrt(pow(momentum[0],2) + pow(momentum[1],2));
121 PostData(0, fOutputContainer);
124 //________________________________________________________________________
125 void AliAnalysisTaskPt::Terminate(Option_t *)
127 // Processing when the event loop is ended
129 TCanvas *c1 = new TCanvas("c1","Pt",10,10,310,310);
130 c1->SetFillColor(10);
131 c1->SetHighLightColor(10);
133 c1->cd(1)->SetLeftMargin(0.15);
134 c1->cd(1)->SetBottomMargin(0.15);
135 c1->cd(1)->SetLogy();
138 c1->Print("TracksPt.eps");
141 sprintf(line, ".!tar -zcvf %s.tar.gz *.eps", GetName()) ;
142 gROOT->ProcessLine(line);
143 sprintf(line, ".!rm -fR *.eps");
144 gROOT->ProcessLine(line);
146 AliInfo(Form("!!! All the eps files are in %s.tar.gz !!! \n", GetName())) ;