run_jet_finder.cc File Reference

#include "fastjet/PseudoJet.hh"
#include "fastjet/ClusterSequence.hh"
#include <iostream>
#include <sstream>
#include <vector>
#include <cstdio>

Include dependency graph for run_jet_finder.cc:

Go to the source code of this file.

Functions
void	print_jets (const fastjet::ClusterSequence &clust_seq, const vector< fastjet::PseudoJet > &jets)
	a function that pretty prints a list of jets
void	run_jet_finder (const vector< fastjet::PseudoJet > &input_particles, const fastjet::JetDefinition &jet_def)
	subroutine that runs fastjet (on input particles from cin) using an arbitrary jet definition supplied as an argument
void	read_input_particles (istream &input, vector< fastjet::PseudoJet > &input_particles)
	a function that reads particles from the supplied istream

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Function Documentation

void print_jets	(	const fastjet::ClusterSequence &	clust_seq,
		const vector< fastjet::PseudoJet > &	jets
	)

a function that pretty prints a list of jets

Definition at line 93 of file run_jet_finder.cc.

References fastjet::d0::inline_maths::phi(), and sorted_by_pt().

                                                        {

  // sort jets into increasing pt
  vector<fastjet::PseudoJet> sorted_jets = sorted_by_pt(jets);  

  // label the columns
  printf("%5s %15s %15s %15s %15s\n","jet #", "rapidity", 
         "phi", "pt", "n constituents");
  
  // print out the details for each jet
  for (unsigned int i = 0; i < sorted_jets.size(); i++) {
    int n_constituents = clust_seq.constituents(sorted_jets[i]).size();
    printf("%5u %15.8f %15.8f %15.8f %8u\n",
           i, sorted_jets[i].rap(), sorted_jets[i].phi(),
           sorted_jets[i].perp(), n_constituents);
  }

}

void read_input_particles	(	istream &	input,
		vector< fastjet::PseudoJet > &	input_particles
	)

a function that reads particles from the supplied istream

Definition at line 74 of file run_jet_finder.cc.

Referenced by main().

                                                                     {

  // read in input particles
  double px, py , pz, E;
  string line;
  while (getline(input, line)) {
    if (line.substr(0,1) == "#") {continue;}
    istringstream linestream(line);
    linestream >> 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)); 
  }
  
}

void run_jet_finder	(	const vector< fastjet::PseudoJet > &	input_particles,
		const fastjet::JetDefinition &	jet_def
	)

subroutine that runs fastjet (on input particles from cin) using an arbitrary jet definition supplied as an argument

Definition at line 48 of file run_jet_finder.cc.

References print_jets().

Referenced by main().

                                                           {
  
  // run the jet clustering with the above jet definition
  fastjet::ClusterSequence clust_seq(input_particles, jet_def);

  // tell the user what was done
  cout << "Ran " << jet_def.description() << endl;

  // extract the inclusive jets with pt > 5 GeV
  double ptmin = 5.0;
  vector<fastjet::PseudoJet> inclusive_jets = clust_seq.inclusive_jets(ptmin);

  // print them out
  cout << "Printing inclusive jets with pt > "<< ptmin<<" GeV\n";
  cout << "---------------------------------------\n";
  print_jets(clust_seq, inclusive_jets);
  cout << endl;

  // print out unclustered stuff
  cout << clust_seq.unclustered_particles().size() << " particles unclustered" << endl << endl;
}