klieret/use_basf2_installation.md

## use_basf2_installation.md

      
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              use_basf2_installation.md
            
          
    Use basf2 installation:

Set up basf2
cd /cvmfs/belle.cern.ch/ubuntu1604/
source tools/setup_belle2
cd releases/build-2017-10-16/
setuprel

Rerun those commands every time you start working agai!
Check that everything is working:
basf2 --info

Now copy the tutorial files to your home directory:
cd 
cp -r /cvmfs/belle.cern.ch/ubuntu1604/releases/build-2017-10-16/analysis/examples/tutorials/ .

Now run the first tutorial:
cd tutorials
python3 B2A101-Y4SEventGeneration.py

Inspecting root files

Open root:
root

This gives you a C++ console. You can start some "File browser" by typing
new TBrowser

navigate to the output files "*.root" that you just generated by running the tutorial and open them. More information about TBrowser here: https://root.cern.ch/meet-ttree
You can for example go to MCParticles/.... m_masses and see that for the first example there are exactly 5 peeks corresponding to the 5 particles that were generated (Why 5 particles? Check the corresponding pythia .dec file which you loaded in the python script).