accumulator.h

#ifndef ACCUMULATOR__H
#define ACCUMULATOR__H

#include <math.h> // for sqrt


class Accumulator
{
private :
  double sum;
  double sum2;
  int count;

public :
  Accumulator() : sum(0), sum2(0), count(0) {};
  void AddVal(const double &Val) { sum+= Val; sum2+=Val*Val; count++;}
  int Count() const {return count;}
  double Average() const { return sum/count;}
  double Rms() const 
  {
    if (count == 0 || count == 1) return 0;
    return sqrt((sum2 - sum*sum/double(count))/double(count-1));
  }
};


#endif /*  ACCULULATOR__H */