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03-plugin.cc
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//----------------------------------------------------------------------
/// \file
/// \page Example03 03 - using plugins
///
/// fastjet plugins example program:
/// we illustrate the plugin usage
/// here, we use the SISCone plugin though different choices are possible
/// see the output of 'fastjet-config --list-plugins' for more details
///
/// Note that when using plugins, the code needs to be linked against
/// the libfastjetplugins library (with the default monolithic
/// build. For non-monolithic build, individual libraries have to be
/// used for each plugin).
/// This is ensured in practice by calling
/// fastjet-config --libs --plugins
///
/// run it with : ./03-plugin < data/single-event.dat
///
/// Source code: 03-plugin.cc
//----------------------------------------------------------------------
//STARTHEADER
// $Id$
//
// Copyright (c) 2005-2018, Matteo Cacciari, Gavin P. Salam and Gregory Soyez
//
//----------------------------------------------------------------------
// This file is part of FastJet.
//
// FastJet is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// The algorithms that underlie FastJet have required considerable
// development and are described in hep-ph/0512210. If you use
// FastJet as part of work towards a scientific publication, please
// include a citation to the FastJet paper.
//
// FastJet is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with FastJet. If not, see <http://www.gnu.org/licenses/>.
//----------------------------------------------------------------------
//ENDHEADER
#include "fastjet/ClusterSequence.hh"
#include <iostream> // needed for io
#include <cstdio> // needed for io
// include the SISCone plugin header if enabled
#include "fastjet/config.h"
#ifdef FASTJET_ENABLE_PLUGIN_SISCONE
#include "fastjet/SISConePlugin.hh"
#else
#warning "SISCone plugin not enabled. Skipping the example"
#endif // FASTJET_ENABLE_PLUGIN_SISCONE
using namespace std;
int main(){
#ifdef FASTJET_ENABLE_PLUGIN_SISCONE
// read in input particles
//----------------------------------------------------------
vector<fastjet::PseudoJet> input_particles;
double px, py , pz, E;
while (cin >> px >> py >> pz >> E) {
// create a fastjet::PseudoJet with these components and put it onto
// back of the input_particles vector
input_particles.push_back(fastjet::PseudoJet(px,py,pz,E));
}
// create a jet definition fron a plugin.
// It basically requires declaring a JetDefinition from a pointer to
// the plugin
//
// we will use the SISCone plugin here. Its (mandatory) parameters
// are a cone radius and an overlap threshold, plus other optional
// parameters
//
// for other plugin, see individual documentations for a description
// of their parameters
//
// the list of available plugins for a given build of FastJet can be
// obtained using
// fastjet-config --list-plugins
// from the command line.
//----------------------------------------------------------
double cone_radius = 0.7;
double overlap_threshold = 0.75;
fastjet::SISConePlugin siscone(cone_radius, overlap_threshold);
fastjet::JetDefinition jet_def(& siscone);
// run the jet clustering with the above jet definition
//----------------------------------------------------------
fastjet::ClusterSequence clust_seq(input_particles, jet_def);
// get the resulting jets ordered in pt
//----------------------------------------------------------
double ptmin = 5.0;
vector<fastjet::PseudoJet> inclusive_jets = sorted_by_pt(clust_seq.inclusive_jets(ptmin));
// tell the user what was done
// - the description of the algorithm used
// - extract the inclusive jets with pt > 5 GeV
// show the output as
// {index, rap, phi, pt}
//----------------------------------------------------------
cout << "Ran " << jet_def.description() << endl;
// label the columns
printf("%5s %15s %15s %15s\n","jet #", "rapidity", "phi", "pt");
// print out the details for each jet
for (unsigned int i = 0; i < inclusive_jets.size(); i++) {
printf("%5u %15.8f %15.8f %15.8f\n",
i, inclusive_jets[i].rap(), inclusive_jets[i].phi(),
inclusive_jets[i].perp());
}
#endif
return 0;
}
main
int main()
an example program showing how to use fastjet
Definition 01-basic.cc:50
fastjet::ClusterSequence
deals with clustering
Definition ClusterSequence.hh:63
fastjet::JetDefinition
class that is intended to hold a full definition of the jet clusterer
Definition JetDefinition.hh:250
fastjet::PseudoJet
Class to contain pseudojets, including minimal information of use to jet-clustering routines.
Definition PseudoJet.hh:68
fastjet::SISConePlugin
Implementation of the SISCone algorithm (plugin for fastjet v2.1 upwards).
Definition SISConePlugin.hh:72
fastjet::sorted_by_pt
vector< PseudoJet > sorted_by_pt(const vector< PseudoJet > &jets)
return a vector of jets sorted into decreasing kt2
Definition PseudoJet.cc:882