-
Notifications
You must be signed in to change notification settings - Fork 68
/
runningavg.c
55 lines (46 loc) · 1.47 KB
/
runningavg.c
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
/*
* Copyright 2017 Tom Wimmenhove<[email protected]>
*
* This file is part of Subarufobrob
*
* Subarufobrob is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Subarufobrob is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Subarufobrob. If not, see <http://www.gnu.org/licenses/>.
*/
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include "runningavg.h"
void runningAvgInit(runningAvgContext* ctx, int len)
{
ctx->history = malloc(len * sizeof(double));
memset(ctx->history, 0, len * sizeof(double));
ctx->len = len;
ctx->pos = 0;
ctx->total = 0.0;
}
void runningAvgDone(runningAvgContext* ctx)
{
free(ctx->history);
}
double runningAvg(runningAvgContext* ctx, double sample)
{
ctx->total -= ctx->history[ctx->pos];
ctx->history[ctx->pos] = sample;
ctx->total += sample;
ctx->pos++;
if (ctx->pos >= ctx->len)
{
ctx->pos = 0;
}
return ctx->total / (double) ctx->len;;
}