Difference: HUSUSYRoot (3 vs. 4)

Revision 42009-06-30 - AnitaKapusi

Line: 1 to 1
 
META TOPICPARENT name="SusySearch"

How to use Root:


http://root.cern.ch/

"How to" page:
http://root.cern.ch/drupal/content/howtos
User's guide:
http://root.cern.ch/drupal/content/users-guide
Reference guide:
http://root.cern.ch/drupal/content/reference-guide

Changed:
<
<

Run it:

>
>

Run the Root:

root -l
 
Deleted:
<
<
root -l
 
Open a file:

TFile *_file0 = TFile::Open("..... .root")

File browser:
TBrowser < name >
List the directories:

.ls
< directory name >.cd()

Print the tree:

< ntuplename >.Print()

Scan the tree:

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

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:
Changed:
<
<
< name of the tree in the file >.Draw("< name of a Branch >.< name of a leaf >") 2D histogram:
< name of the tree in the file >. Draw("< name of a Branch1 >.< name of a leaf1 >:< name of a Branch2 >.< name of a leaf2 >")
>
>
< name of the tree in the file >.Draw("< name of a Branch >.< name of a leaf >")
 
Changed:
<
<
histogram with cut criteria:
< 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>")
>
>
2D histogram:
 
Changed:
<
<
draw two histogram in one canvas:
< 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 Branch1 >.< name of a leaf1 >:< name of a Branch2 >.< name of a leaf2 >")

histogram with cut criteria:

< 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:

< 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")
e.g.:
tree.Draw("pelectron_1.tight: pelectron_1.loose ","pelectron_1.tight>-1")
Open an AOD file in root:

gSystem->Load("libFWCoreFWLite");
AutoLibraryLoader::enable();
TFile *_file0 = TFile::Open("rfio:/castor/cern.ch/user/........ .root")
TBrowser b

TChain:

Chain.C:
#include

void Chain(){
TChain tree("stopAnaMod/tree");
tree.AddFile("stopAnaNtuple_noselection_Chowder_00.root");
tree.Draw("event");
}

Save a histogram to .eps:

TCanvas *c1=new TCanvas ("","",1);

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

c1->SaveAs("< name >.eps");

Usage of MakeClass :

-- AnitaKapusi - 29 Jun 2009

 
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