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#pragma once
#ifndef STATS_H
#define STATS_H
#include <math.h>
struct stats_running {
unsigned n;
double S;
double m;
};
#define STATS_RUNNING_INIT {0, NAN, NAN}
void stats_running_reset(struct stats_running *s);
void stats_running_push(struct stats_running *s, double value);
static inline
unsigned stats_running_N(struct stats_running const *s)
{
return s ? s->n : 0;
}
static inline
double stats_running_mean(struct stats_running const *s)
{
return s && (0 < s->n) ? s->m : NAN;
}
static inline
double stats_running_variance(struct stats_running const *s)
{
return s && (1 < s->n) ? s->S/s->n : NAN;
}
#endif/*STATS_H*/
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