HUSUSYRoot < CMS

---+ How to use Root:

<br /> <a href="http://root.cern.ch/">%RED%http://root.cern.ch/%ENDCOLOR%</a><br /> <br /> "How to" page:<br /> <a href="http://root.cern.ch/drupal/content/howtos">http://root.cern.ch/drupal/content/howtos</a><br /> User's guide:<br /> <a href="http://root.cern.ch/drupal/content/users-guide">http://root.cern.ch/drupal/content/users-guide</a><br /> Reference guide:<br /> <a href="http://root.cern.ch/drupal/content/reference-guide">http://root.cern.ch/drupal/content/reference-guide</a>

---+++ Run it:

_root -l_
---++++++ Open a file:

_TFile *_file0 = TFile::Open("..... .root")_
---++++++ File browser:
 _TBrowser_ < name > 
---++++++ List the directories:

<em>.ls<br /></em> <em>< directory name >.cd()</em>
---++++++ Print the tree:

<em>< ntuplename >.Print()</em>
---++++++ Scan the tree:

<em>< ntuplename >.Scan("< name of a Branch >.< name of a leaf >")</em>

---++++++ Make a new histogram:

_TH1F * = new TH1F("name","",#ofXaxis,#ofYaxis,#ofBins);_
---++++++ Make a new canvas:

_TCanvas *c1=new TCanvas ("name","",1);_

---++++++ Draw a histogram:

_name of the tree in the file.Draw("name of a Branch.name of a leaf")_

2D histogram:<br /> _name of the tree in the file.Draw("name of a Branch1.name of a leaf1:name of a Branch2.name of a leaf2")_

histogram with cut criteria:<br />_name of the tree in the file.Draw("name of a Branch1.name of a leaf1,name of a Branch2.name of a leaf2 cut criteria")_

draw two histogram in one canvas:<br />< _name of the tree in the file>.Draw("<name of a Branch1>.<name of a leaf1>")_

<name of the tree in the file>.Draw("<name of a Branch2>.<name of a leaf2> _","","SAME")_ <br /> e.g.:<br /> _tree.Draw("pelectron_1.tight:_ _pelectron_1.loose_ _","pelectron_1.tight>-1")_
---++++++ Open an AOD file in root:
---++++++ 

_gSystem->Load("libFWCoreFWLite");<br />AutoLibraryLoader::enable();<br /> TFile *_file0 = TFile::Open("rfio:/castor/cern.ch/user/........ .root") <br /> TBrowser b_
---++++++ TChain:

Chain.C:<br /> _#include_

_void Chain(){<br /> TChain tree("stopAnaMod/tree");<br /> tree.AddFile("stopAnaNtuple_noselection_Chowder_00.root");<br /> tree.Draw("event");<br /> }_
---++++++ Save a histogram to .eps:

TCanvas *=new TCanvas ("<name>","",1);

<name of the tree in the file>.Draw("<name of a Branch>.<name of a leaf>")

_c1->SaveAs("<name>.eps");_
---++++++ Usage of MakeClass:

-- Main.AnitaKapusi - 29 Jun 2009

This topic: CMS > WebHome > NewPhysics > SusySearch > HUSUSYRoot
Topic revision: r2 - 2009-06-29 - AnitaKapusi

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