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annotate stat.c @ 245:b1dc2ba9a315

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Revise dedrift automatic slope update disable logic
author Daniele Nicolodi <daniele@grinta.net>
date Thu, 26 Feb 2015 23:11:01 +0100
parents be87c8e78266
children
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1 #include <ansi_c.h>
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2 #include "stat.h"
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3
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4 void stat_zero(struct stat *s)
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5 {
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6 s->samples = 0;
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7 s->mean = 0.0;
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8 s->slope = 0.0;
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9 s->previous = 0.0;
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10 }
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13 void stat_accumulate(struct stat *s, double value)
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14 {
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15 s->samples += 1;
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16 if (s->samples > 1)
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17 s->slope = (s->slope * (s->samples - 2) + 6 * (value - s->mean) / s->samples) / (s->samples + 1);
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18 s->mean = ((s->samples - 1) * s->mean + value) / s->samples;
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19 s->previous = value;
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20 }
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22
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23 void rollmean_zero(struct rollmean *s)
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24 {
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25 s->nobs = 0;
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26 s->mean = 0.0;
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27 s->acc = 0.0;
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28 memset(s->prev, 0, sizeof(s->prev));
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29 }
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32 void rollmean_accumulate(struct rollmean *s, double value)
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33 {
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34 s->acc = s->acc + value - s->prev[s->nobs % _ROLLMEAN_WLEN];
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35 s->prev[s->nobs % _ROLLMEAN_WLEN] = value;
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36 s->nobs++;
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37 if (s->nobs < _ROLLMEAN_WLEN)
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38 s->mean = s->acc / s->nobs;
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39 else
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40 s->mean = s->acc / _ROLLMEAN_WLEN;
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41 }