(r3) HUSUSYRoot < CMS

CMS Web>NewPhysics>SusySearch>HUSUSYRoot (revision 3) (raw view)~~EditAttach~~

---+ 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:
 <em>TBrowser < name ></em> 
---++++++ List the directories:

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

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

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

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

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

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

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

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

histogram with cut criteria:<br /><em>< 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>") </em>

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

<em> < name of the tree in the file >.Draw("< name of a Branch2 >.< name of a leaf2 > </em> _","","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 *c1=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

Topic revision: r3 - 2009-06-29 - AnitaKapusi

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