JQuantiles2D.cc

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#include <string>
#include <iostream>
#include <iomanip>
#include <vector>
#include <cmath>
 
#include "TROOT.h"
#include "TFile.h"
#include "TObject.h"
#include "TKey.h"
#include "TH2.h"
#include "TH1D.h"
#include "TString.h"
#include "TRegexp.h"
 
#include "JGizmo/JRootObjectID.hh"
#include "JGizmo/JGizmoToolkit.hh"
 
#include "Jeep/JParser.hh"
#include "Jeep/JMessage.hh"
 
  
/**
 * \file
 *
 * Auxiliary program to extract quantiles from 2D histogram.\n
 * The option <tt>-f</tt> corresponds to <tt><file name>:<object name></tt>.\n
 * The quantiles are computed for the y-axis.\n
 * The computation of the quantiles includes under and overflows.
 * \author mdejong
 */
int main(int argc, char **argv)
{
  using namespace std;
  using namespace JPP;
 
  vector<JRootObjectID>   inputFile;
  string                  outputFile;
  vector<double>          Q;
  bool                    reverse;
  int                     debug;
 
  try {
 
    JParser<> zap("Auxiliary program to extract quantiles from 2D histogram.");
    
    zap['f'] = make_field(inputFile);
    zap['o'] = make_field(outputFile) = "quantiles.root";
    zap['Q'] = make_field(Q);
    zap['R'] = make_field(reverse);
    zap['d'] = make_field(debug)      = 0;
     
    zap(argc, argv);
  }
  catch(const exception &error) {
    FATAL(error.what() << endl);
  }
 
 
  if (Q.empty()) {
    FATAL("No quantiles." << endl);
  }
 
  TFile out(outputFile.c_str(), "recreate");
 
 
  for (vector<JRootObjectID>::const_iterator input = inputFile.begin(); input != inputFile.end(); ++input) {
 
    DEBUG("Input: " << *input << endl);
 
    TDirectory* dir = getDirectory(*input);
 
    if (dir == NULL) {
      ERROR("File: " << input->getFullFilename() << " not opened." << endl);
      continue;
    }
 
    const TRegexp regexp(input->getObjectName());
 
    TIter iter(dir->GetListOfKeys());
 
    for (TKey* key; (key = (TKey*) iter.Next()) != NULL; ) {
 
      const TString tag(key->GetName());
 
      DEBUG("Key: " << tag << " match = " << tag.Contains(regexp) << endl);
        
      // option match
 
      if (tag.Contains(regexp) && isTObject(key)) {
 
        TObject* object = key->ReadObj();
 
        try {
 
          TH2& h2 = dynamic_cast<TH2&>(*object);
 
          vector<TH1D*> h1(Q.size(), NULL);
 
          for (size_t i = 0; i != Q.size(); ++i) {
 
            ostringstream os;
 
            os << h2.GetName();
            os << i << "[" << setw(3) << (int) (100.0 * Q[i]) << "%]";
 
            DEBUG("Creating 1D histogram: " << os.str() << endl);
 
            TAxis* axis = h2.GetXaxis();
 
            if (axis->IsVariableBinSize())
              h1[i] = new TH1D(os.str().c_str(), NULL, axis->GetNbins(), axis->GetXbins()->GetArray());
            else
              h1[i] = new TH1D(os.str().c_str(), NULL, axis->GetNbins(), axis->GetXmin(), axis->GetXmax());
          }
 
 
          for (Int_t ix = 1; ix <= h2.GetXaxis()->GetNbins(); ++ix) {
 
            Double_t W = 0.0;
 
            for (Int_t iy = 0; iy <= h2.GetYaxis()->GetNbins() + 1; ++iy) {
              W += h2.GetBinContent(ix,iy);
            }
 
            if (W != 0.0) {
 
              Double_t w = 0.0;
                
              if (!reverse) {
 
                for (int iy = 0, k = 0; iy <= h2.GetYaxis()->GetNbins() + 1; ++iy) {
                  
                  w += h2.GetBinContent(ix,iy);
                  
                  for ( ; k != (int) h1.size() && w >= Q[k]*W; ++k) {
                    h1[k]->SetBinContent(ix, h2.GetYaxis()->GetBinCenter(iy));
                  }
                }
 
              } else {
 
                for (int iy = h2.GetYaxis()->GetNbins() + 1, k = 0; iy >= 0; --iy) {
                  
                  w += h2.GetBinContent(ix,iy);
                  
                  for ( ; k != (int) h1.size() && w >= Q[k]*W; ++k) {
                    h1[k]->SetBinContent(ix, h2.GetYaxis()->GetBinCenter(iy));
                  }
                }
              }
            }
          }
 
          out.cd();
 
          for (vector<TH1D*>::iterator i = h1.begin(); i != h1.end(); ++i) {
            (*i)->Write();
          }
        }           
        catch(exception&) {
          ERROR("Not available for other objects than 2D histograms." << endl);
        }
      }
    }
  }
 
  out.Write();
  out.Close();
}