Statistics.hpp

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#ifndef AI_TOOLBOX_STATISTICS_HEADER_FILE
#define AI_TOOLBOX_STATISTICS_HEADER_FILE
 
#include <vector>
#include <iosfwd>
 
namespace AIToolbox {
    class Statistics {
        public:
            //                        mean,  cum mean,  std,  cum std
            using Result = std::tuple<double, double, double, double>;
            using Results = std::vector<Result>;
 
            Statistics(size_t timesteps);
 
            void record(double value, size_t timestep);
 
            Results process() const;
 
        private:
            //                       Count,    sum,    sum squared, squared sum
            using Point = std::tuple<unsigned, double, double,      double>;
 
            std::vector<Point> data_;
            size_t prevTimestep_;  
            double currentCumulativeValue_; 
    };
 
    std::ostream& operator<<(std::ostream& os, const Statistics & rh);
}
 
#endif