1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
#include <math.h>
#include <stats.h>
#include <stdlib.h>
#include <dbg.h>
Stats *Stats_recreate(double sum, double sumsq, unsigned long n,
double min, double max)
{
Stats *st = malloc(sizeof(Stats));
check_mem(st);
st->sum = sum;
st->sumsq = sumsq;
st->n = n;
st->min = min;
st->max = max;
return st;
error:
return NULL;
}
Stats *Stats_create()
{
return Stats_recreate(0.0, 0.0, 0L, 0.0, 0.0);
}
void Stats_sample(Stats *st, double s)
{
st->sum += s;
st->sumsq += s * s;
if (st->n == 0) {
st->min = s;
st->max = s;
} else {
if (st->min > s)
st->min = s;
if (st->max < s)
st->max = s;
}
st->n += 1;
}
char *Stats_dump(Stats *st)
{
size_t char_sz = sizeof(char);
size_t dstr_len = 280 * char_sz;
// allocate space for dump string.
char *dstr = calloc(dstr_len, char_sz);
check_mem(dstr);
// dump into dump str.
int rc = snprintf(dstr, dstr_len,
"sum: %f, sumsq: %f, n: %ld, "
"min: %f, max: %f, mean: %f, stddev: %f",
st->sum, st->sumsq, st->n, st->min, st->max,
Stats_mean(st), Stats_stddev(st));
check(rc > 0, "stats dump failed");
return dstr;
error:
return NULL;
}
|
