running_stats.hh

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/*
 *  Copyright (C) 2009 Austin Robot Technology, Jack O'Quin
 *
 *  License: Modified BSD Software License Agreement
 */

#ifndef RUNNING_STATS_HH
#define RUNNING_STATS_HH

#include <cmath>

class RunningStats {
public:
  RunningStats()
  {
    reset();
  }

  // Add a new sample to the series.
  void inline addSample(double new_value)
  {
    ++N_;
    sum_ += new_value;
    sum2_ += new_value * new_value;
  }

  // Reset the sample data.
  void reset(void)
  {
    N_ = 0;
    sum_ = 0.0;
    sum2_ = 0.0;
  }

  // Return the sample mean.
  double inline getMean(void)
  {
    return (sum_ / N_);
  }

  // Return the sample variance using Bessel's correction.
  double inline getVariance(void)
  {
    double mean = getMean();
    if (N_ > 1)
      return (sum2_/(N_-1) - ((double)N_/(N_-1))*mean*mean);
    else
      return 0.0;
  }

  // Return the sample standard deviation using Bessel's correction.
  double inline getStandardDeviation(void)
  {
    return sqrt(getVariance());
  }

private:
  int    N_;                            // number of samples seen
  double sum_;                          // sum of samples seen
  double sum2_;                         // sum of squares of samples seen
};

#endif // RUNNING_STATS_HH

---

velodyne_common
Author(s): Jack O'Quin, Patrick Beeson, Michael Quinlan, Yaxin Liu
autogenerated on Fri Jan 11 10:05:54 2013