JTestChi2_Bin.hh

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#ifndef __JTESTCHI2_BIN__
#define __JTESTCHI2_BIN__

#include <istream>
#include <ostream>
#include "JCompareHistograms/JTest_t.hh"
#include "JCompareHistograms/JTestChi2_t.hh"

/**
 * \author rgruiz
 */

/**
 * Implementation of a bin-by-bin Chi2 test for 2D histograms.\n
 * This class is derived from the abstract class JTest_t(). For a general description of the implementation of this and other tests derived from JTest_t(), see its documentation.\n
 * The test is run by the method JChi2TestBin_2D(). 
 */
class JTestChi2_Bin: 
  public JTest_t,
  public JTestChi2_t
{ 
public:  
  /**
   * Default constructor.
   */
  JTestChi2_Bin(){}
  
  /**
   * Read test parameters from input.
   *
   * \param  in            input stream
   * \return               input stream
   */
  std::istream& read(std::istream& in) override{ 
    return in >> outliersThreshold >> chi2Threshold;
  };

  /**
   * Write test result to output.
   *
   * \param  out           output stream
   * \param  delimiter     field delimiter
   * \param  onlyFailures  If true, write only failures.
   * \return               output stream
   */
  std::ostream& write(std::ostream& out, std::string delimiter = " ", bool onlyFailures = false) const override{
    for (std::vector<JTestResult>::const_iterator r = results.begin() ; r != results.end() ; ++r) {
      if (onlyFailures){
        if (!r->passed)
          out << std::scientific << std::setprecision(2) << (r->passed ? JPP::GREEN : JPP::RED) << r->print(delimiter) << std::endl;
      }else{
        out << std::scientific << std::setprecision(2) << (r->passed ? JPP::GREEN : JPP::RED) << r->print(delimiter) << std::endl;
      }
    }
    return out;
  };

  /**
   * Tests the statistical compatibility of two ROOT 2D histograms
   * 
   * \param o1 First histogram
   * \param o2 Second histogram
   *
   * \return Test result
   */
  void test(TObject* o1, TObject* o2) override{    

    using namespace std;
    
    if (!(dynamic_cast<TH2*>(o1) == NULL) && !(dynamic_cast<TH2*>(o2) == NULL)) {
                  
      TH2D* h1 = dynamic_cast<TH2D*>(o1);
      TH2D* h2 = dynamic_cast<TH2D*>(o2);
      
      JTestResult r = JChi2TestBin_2D(h1, h2, outliersThreshold, chi2Threshold, name, parameter);
      results.push_back(r);
    }
  };
  
  /**
   * Writes the test result to root file
   * \param f A ROOT file 
   * \param path Path in root file.
   * \param onlyFailures  If true, write only failures.
   */
  virtual void save(TFile* f , std::string path, bool onlyFailures = false) override{
    
    using namespace std;
    
    for (vector<JTestResult>::const_iterator r = results.begin() ; r != results.end() ; ++r){
      
      if (onlyFailures){
        if (!r->passed){
          if (f -> GetDirectory(path.c_str())==0) f->mkdir(path.c_str());
          f->cd(path.c_str());
          r->obj->Write();
        }
      }else{
        if (f -> GetDirectory(path.c_str())==0) f->mkdir(path.c_str());
        f->cd(path.c_str());
        r->obj->Write();
      }
    }      
  }

  /**
   * Clear results
   */
  void clear() override{
    results.clear();
  }
  
  /**
   * Get test name.
   */
  std::string getName() override{
    return name;
  }

  /**
   * Get parameter name.
   */
  std::string getParameter() override{
    return parameter;
  }

private:
  double chi2Threshold;                        //!< threshold p-value to decide if test is passed for a bin.
  double outliersThreshold;                    //!< number of bins allowed to fail the test.
  const std::string name = "Chi2_Bin";         //!< test name.
  const std::string parameter = "Outliers[%]"; //!< parameter name.
}; 
  
#endif