check_hist_entries.cxx

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#include <iostream>
#include <fstream>
#include <iomanip>
#include <cstring>
#include <string>
#include <vector>
#include <TFile.h>
#include <TTree.h>
#include <TString.h>
#include <TH1F.h>
#include <TKey.h>
 
using namespace std;
 
int main(int argc, char *argv[]){
  if(argc<3){
    cout << "please append a root file name and threshod numbers" << endl;
    cout << "Ex. check_hist_ent.exe test.root 1000" << endl;
    return 1;
  }
 
  TString str_root_file(argv[1]);
  TFile f(str_root_file);
  TList *l = f.GetListOfKeys();
  double m_min(99999), m_max(0), m_total(0), m_ave(0), m_size(0);
  Int_t m_temp;
  Int_t m_thres;
  TH1F *h(0);
  sscanf(argv[2], "%d", &m_thres);
  TIter next(l);
  TKey *obj(0);
  while ((obj = (TKey*)next())){
    TString str_temp(obj->GetClassName());
    if(str_temp.Contains("TTree")) continue;
    m_size += 1;
    h = (TH1F*)f.Get(obj->GetName());
    m_temp = h->GetEntries();
    m_total += m_temp;
    if(m_temp<m_min) m_min = m_temp;
    if(m_temp>m_max) m_max = m_temp;
    if(m_temp<m_thres) cout << h->GetName() << " has entries " << m_temp << " less than threshod" << endl;
  }
  m_ave = m_total/m_size;
  cout << "min: " << m_min << "  max: " << m_max << "  ave: " << m_ave << " size: " << m_size << endl;
  return 0;
}