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example_correlation.cc
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example_correlation.cc
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#include <iostream>
#include "events.h"
#include "coverage.h"
#include "angdist.h"
#include "maptools.h"
#include "correlation.h"
#include "simuevents.h"
#include "common.h"
// ROOT
#include "TCanvas.h"
#include "TRint.h"
#include "TROOT.h"
#include "TStyle.h"
#ifdef gcc323
char* operator+( std::streampos&, char* );
#endif
using namespace std;
void Usage(string myName)
{
cout << endl;
cout << " Synopsis : " << endl;
cout << myName << " <events file> <simu flag>" << endl << endl;
cout << " Description :" << endl;
cout << myName << " computes the 2-points correlation function. The <simu flag> must be set to 0 if one wants "
<< "to compute the 2-points correlation function of the events stored in <events file> and set to 1 if "
<< "one wants to use simulated events. In the latter case <events file> will be ignored. The "
<< "<events file> must contain the following fields :" << endl;
DumpFields();
cout << endl;
exit(0);
}
int main(int argc, char* argv[])
{
////////////////////////////////////////////////////////////////////////////
// //
// To start (initialization) //
// //
////////////////////////////////////////////////////////////////////////////
// Command line
if(argc != 3) Usage(argv[0]);
string eventFile = argv[1];
int isSimu = atoi(argv[2]);
if( !CheckFile(eventFile) ) {cerr << "File: " << eventFile << " not found" << endl; exit(0);}
// ROOT
int fargc = 1;
string extension;
TRint* rint = new TRint("2pt Correlation", &fargc, argv);
extension = ".png";
gROOT->SetStyle("Plain");
gStyle->SetTitleFont(30,"TITLE");
////////////////////////////////////////////////////////////////////////////
// //
// Events (file or simulation) //
// //
////////////////////////////////////////////////////////////////////////////
unsigned int nSide = 64;
double latSite = kConstantsTK::AugerSouthLatitude;
double lonSite = kConstantsTK::AugerSouthLongitude;
double thetaMax = 60.;
unsigned int nVal = 5000;
vector<double> thVal(nVal), pthVal(nVal);
for(unsigned int i = 0; i < nVal; i++)
{
thVal[i] = i*180./(nVal-1);
pthVal[i] = sin(thVal[i]*DTOR)*cos(thVal[i]*DTOR);
if (thVal[i] > thetaMax) pthVal[i] = 0;
}
vector<TEvent> events;
if(isSimu == 1)
{
THealpixMap mapSimu(nSide);
mapSimu = 1; // Isotropic case
unsigned int nb = 69;
events = SimulateEvents(mapSimu, nb, thVal, pthVal, latSite, lonSite);
cout << events.size() << " events simulated" << endl;
}
else
{
cout << "Reading events file " << eventFile << endl;
events = GetEvents(eventFile);
if( !events.size() ) {cout << "Program Failed: No events read. Exiting." << endl; exit(0);}
}
////////////////////////////////////////////////////////////////////////////
// //
// Analysis //
// //
////////////////////////////////////////////////////////////////////////////
/* Three way to compute the coverage correlation function :
+ using coverage map (events or analytic) and then the relation existing
between C(l) and C(theta)
+ using simulation to generate events
+ one can just scrambled the arrival times of the events to get new
samples of events
*/
#define simulation
/*
#define cMapAnalytic
#define scrambling
#define simulation
*/
unsigned int dAlpha = 1;
double alphaCut = 60.;
double dispersion = 0.9;
#ifdef simulation
// Using Simulation
TCorrelation correlation(events, dAlpha, alphaCut);
correlation.SetExtension(extension);
cout << "Events Correlation Function Computation" << endl;
correlation.ComputeEventsCorrelation();
cout << "Coverage Correlation Function Computation using simulation" << endl;
unsigned int nSimu = 250;
THealpixMap map(nSide);
map = 1;
correlation.ComputeCoverageCorrelationSimu(lonSite, latSite, map, nSimu, dispersion, thVal, pthVal);
vector<double> alpha, Np, errLow, errHigh;
correlation.GetCoverageCorrelation(alpha,Np,errLow,errHigh);
for(unsigned int i = 0; i < Np.size(); i++)
cout << "Angle: " << alpha[i] << " Expected Np: " << Np[i] << " Error: " << errLow[i] << "/" << errHigh[i] << endl;
#endif
#ifdef scrambling
// Using Monte Carlo
TCorrelation correlation(events, dAlpha, alphaCut);
correlation.SetExtension(extension);
cout << "Events Correlation Function Computation" << endl;
correlation.ComputeEventsCorrelation();
cout << "Coverage Correlation Function Computation using scrambled data Set" << endl;
unsigned int nMC = 10;
string binningType = "EVENTS";
string scramblingType = "UTC+JD";
correlation.ComputeCoverageCorrelationMC(lonSite, latSite, nMC, dispersion, binningType, scramblingType, thetaMax);
vector<double> alpha, Np, errLow, errHigh;
correlation.GetCoverageCorrelation(alpha,Np,errLow,errHigh);
for(unsigned int i = 0; i < Np.size(); i++)
cout << "Angle: " << alpha[i] << " Expected Np: " << Np[i] << " Error: " << errLow[i] << "/" << errHigh[i] << endl;
#endif
#ifdef cMapAnalytic
// Using Coverage Map (Analytic)
TCoverage coverage(nSide);
coverage.SetCoordSystem('G');
coverage.fMap = GetAnalyticalCoverage(nSide, thetaMax, kConstantsTK::AugerSouthLatitude);
THealpixMap covMap = coverage.GetMap();
covMap *= 1./covMap.Max(); // Normalization: maximum equal to 1
// Events and coverage correlation function
TCorrelation correlation(events, dAlpha, alphaCut);
correlation.SetExtension(extension);
cout << "Events Correlation Function Computation" << endl;
correlation.ComputeEventsCorrelation();
cout << "Coverage Correlation Function Computation using the coverage map" << endl;
correlation.ComputeCoverageCorrelationMap(covMap);
vector<double> alpha, Np, errLow, errHigh;
correlation.GetCoverageCorrelation(alpha,Np,errLow,errHigh);
for(unsigned int i = 0; i < Np.size(); i++)
cout << "Angle: " << alpha[i] << " Expected Np: " << Np[i] << " Error: " << errLow[i] << "/" << errHigh[i] << endl;
#endif
// 2 pts correlation function
correlation.DrawEvents();
correlation.DrawCov();
correlation.DrawBoth();
cout << "Program Finished Normally" << endl;
rint->Run(kTRUE);
}