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--- snowmass2013:analyse_d3 [2013/05/30 18:53]
127.0.0.1 external edit
+++ snowmass2013:analyse_d3 [2014/04/24 01:51]
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-[[snowmass2013:montecarlo| <<back]]
-=== How to analyze Delphes3 ROOT files ===
-This example shows how to run a program over all files in a certain directory, fill histograms (pT and jet mass) and
-save histograms in an output ROOT file.
-Look at the workbook of Delphes3 [[https://cp3.irmp.ucl.ac.be/projects/delphes/wiki/WorkBook| Delphes3 workbook]].
-To get started, install Delphes. You  should see the library "libDelphes.so".  The you can browser the ROOT tree as:
-<code C>
-gSystem->Load("libDelphes");
-TFile::Open("delphes_output.root");
-Delphes->Draw("Electron.PT");
-TBrowser browser;
-</code>
-=== Advanced  Delphes3 example  ===
-This assumes that Delphes3 is already installed. You have the directory "Delphes3" with the shared file "libDelphes.so" inside.
-Get the analysis file: {{:snowmass2013:antup.tgz|}}
-<code>
-tar -zvxf antup.tgz
-cd antup
-</code>
-So you will see 2 directories:
-<code>
-delphes3
-antup
-</code>
-Now go to the directory "antup"  and link the existing  Delphes3 installation:
-<code>
-ln -s  ../Delphes3  delphes
-</code>
-In my case, it will look as:
-<code>
-analysis.h
-A_RUN_TEST
-data.in
-delphes -> ../Delphes3/
-main.cxx
-Make_input
-out
-</code>
-Check that you see the shared Delphes3 file
-<code>
-ls -l delphes/*so
-</code>
-You should see "delphes/libDelphes.so"
-The main file which fills histograms is "main.cxx". It fills some jet variables and save histograms in the ROOT file in "/out" directory.
-To run the code, run "./A_RUN_TEST" which loops over the existing ROOT files.
-But before you do this, you will need to set "DATA_DIR" variable inside "A_RUN_TEST" to navigate to the directory with your "ROOT" files.
- --- //[[[email protected]|Sergei Chekanov]] 2013/03/13 10:23//

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