simple_stat.h

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#ifndef TrackingTools_DetLayers_simple_stat_h
#define TrackingTools_DetLayers_simple_stat_h

#include <algorithm>
#include <numeric>
#include <cmath>

template <class CONT>
double stat_mean(const CONT& cont) {
  double sum = accumulate(cont.begin(), cont.end(), 0.);
  return sum / cont.size();
}

template <class CONT>
double stat_RMS(const CONT& cont) {
  typename CONT::const_iterator i;

  int N = cont.size();
  if (N > 1) {
    double sum = 0., sum2 = 0.;
    for (i = cont.begin(); i != cont.end(); i++) {
      sum += *i;
      sum2 += (*i) * (*i);
    }
    return sqrt(std::max(0., (sum2 - sum * sum / N) / (N - 1)));
  } else
    return 0.;
}

#endif  // TrackingTools_DetLayers_simple_stat_h