...
Getting Started & Compile
Check out the code from SVN (require ATLAS privileges):
$cd ~/nfs
$svn co $SVNINST/Institutes/SLAC/JetWorkingGroup/LightJetAnalysis/trunk LightJetAnalysis
(1) Install FastJet (only if you're not running this at SLAC but on your laptop!)
Follow instructions here: http://fastjet.fr/quickstart.html
(2) Check out the code from GitHub
git clone https://github.com/SLACJetWorkingGroup/LightJetAnalysis.gitwhere SVNINST stands for something like svn+ssh://[username]@svn.cern.ch/reps/atlasinst
If you run this on your local machine (and not on atlint) you need to adjust the file setup.sh to point to your local installation of fastjet and root.
- Note: if you have the C++ boost library installed, you can set it up in the setup.sh file. This allows you set arguments in the command line.
$source setup.sh
$make
(3) Copy input test file:
scp <userid>@atlint03.slac.stanford.edu:/atlas/output/pnef/skimmed.20140609.17.13_ClustersAndTruth.PythJ1to3mc12aJETMET.jetmet2012.root .
(1 GB in size)
A larger sample is available at:
/atlas/output/pnef//20140609.17.13_ClustersAndTruth.PythJ1to3mc12aJETMET.jetmet2012.root
Running the code
run the executable:
$./runLightJetAnalysis.exe
if you compiled the code against the boost library, you can use
$./runLightJetAnalysis.exe --h
to see the available run options / arguments.
Changing the MakeClass
The files LightJetAnalysisBase.C and LightJetAnalysisBase.h are generated using the MakeClass() method of a TTree.
If the branches of the TTree of the input file is changed, these two files need to be regenerated. For this, do the following:
$root -l myfile.root
root [1] myTree->MakeClass("LightJetAnalysisBase");
The file LightJetAnalysisBase.h now contains the declaration of the branches of the TTree myTree .
One annoying feature of MakeClass is that the arraw size is taken from the first entry of the tree. For instance, you may find lines like this:
Float_t Jpt[17]; //[NJetsFilled]
which needs to be changed into
Float_t Jpt[NJetsFilled];