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/* SPDX-License-Identifier: BSD-3-Clause */
/*
* Copyright © 2010, Zed A. Shaw.
* Copyright © 2020 rsiddharth <s@ricketyspace.net>
*/
#ifndef stats_h
#define stats_h
#include <math.h>
#include <stdlib.h>
#include <bstrlib.h>
#include <dbg.h>
typedef struct Stats {
double sum;
double sumsq;
unsigned long n;
double min;
double max;
} Stats;
Stats *Stats_recreate(double sum, double sumsq, unsigned long n,
double min, double max);
Stats *Stats_create();
void Stats_sample(Stats *st, double s);
char *Stats_dump(Stats *st);
char *Stats_stringify(Stats *st);
Stats *Stats_unstringify(char *st_str);
static inline double Stats_mean(Stats *st)
{
return st->sum / st->n;
}
static inline double Stats_stddev(Stats *st)
{
return sqrt((st->sumsq - (st->sum * st->sum / st->n)) /
(st->n - 1));
}
#endif
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