JGeane.cc

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#include <string>
#include <iostream>
 
#include "TROOT.h"
#include "TFile.h"
#include "TH1D.h"
#include "TH2D.h"
 
#include "JPhysics/JGeane.hh"
 
#include "Jeep/JParser.hh"
#include "Jeep/JMessage.hh"
 
 
/**
 * \file
 *
 * Example program to histogram muon energy loss.
 * \author mdejong
 */
int main(int argc, char* argv[])
{
  using namespace std;
  using namespace JPP;
 
  string  outputFile;
  int     debug;
 
  try {
 
    JParser<> zap("Example program to histogram muon energy loss.");
 
    zap['o'] = make_field(outputFile) = "geane.root";
    zap['d'] = make_field(debug)      = 2;
 
    zap(argc, argv);
  }
  catch(const exception &error) {
    FATAL(error.what() << endl);
  }
 
 
  TFile out(outputFile.c_str(), "recreate");
 
  TH1D h1("h1", NULL, 900, -1.0, +8.0);
  TH2D h2("h2", NULL,  90, -1.0, +8.0, 100, 0.0, 5.0);
  TH2D h3("h3", NULL, 130, -1.0, +12.0, 90, -1.0, +8.0);
 
  for(int ix = 1; ix <= h1.GetNbinsX(); ++ix) {
 
    const double x = h1.GetBinCenter(ix);
    const double E = pow(10.0, x);
    
    h1.SetBinContent(ix, gWater(E));
  }
 
  for(int ix = 1; ix <= h2.GetXaxis()->GetNbins(); ++ix) {
    for(int iy = 1; iy <= h2.GetYaxis()->GetNbins(); ++iy) {
 
      const double x = h2.GetXaxis()->GetBinCenter(ix);
      const double y = h2.GetYaxis()->GetBinCenter(iy);
 
      const double E  = pow(10.0, x);
      const double dx = pow(10.0, y);
    
      h2.SetBinContent(ix, iy, gWater(E, dx));
    }
  }
 
  const double precision = 1.0e-3;
 
  for(int ix = 1; ix <= h3.GetXaxis()->GetNbins(); ++ix) {
    for(int iy = 1; iy <= ix; ++iy) {
 
      const double x = h3.GetXaxis()->GetBinCenter(ix);
      const double y = h3.GetYaxis()->GetBinCenter(iy);
 
      const double E1 = pow(10.0, x);
      const double E2 = pow(10.0, y);
 
      double Rmin = 0.0;
      double Rmax = gWater(E1);
 
      if (E2 < E1 && Rmax > Rmin) {
 
        double R = 0.0;
 
        for ( ; ; ) {
 
          R = 0.5 * (Rmax + Rmin);
 
          const double E = gWater(E1, R);
 
          if (fabs(E - E2) <=  precision) {
            break;
          }
 
          if (E > E2)
            Rmin = R;
          else
            Rmax = R;
        }
    
        h3.SetBinContent(ix, iy, R);
      }
    }
  }
 
  out.Write();
  out.Close();
}