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annotate stat.c @ 141:e1dec4f11831

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Plot user interface tweaks
author Daniele Nicolodi <daniele.nicolodi@obspm.fr>
date Wed, 22 Jan 2014 14:45:22 +0100
parents e04123ab79ef
children be87c8e78266
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139
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Daniele Nicolodi <daniele.nicolodi@obspm.fr>
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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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12
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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
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17 if (s->samples > 1)
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18 s->slope = (s->slope * (s->samples - 2) + 6 * (value - s->mean) / s->samples) / (s->samples + 1);
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19
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20 s->mean = ((s->samples - 1) * s->mean + value) / s->samples;
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21
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22 s->previous = value;
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23 }
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25
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26 void rollmean_zero(struct rollmean *s)
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27 {
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28 s->nobs = 0;
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29 s->mean = 0.0;
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30 s->acc = 0.0;
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31 memset(s->prev, 0, sizeof(s->prev));
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32 }
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35 void rollmean_accumulate(struct rollmean *s, double value)
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36 {
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37 s->acc = s->acc + value - s->prev[s->nobs % _ROLLMEAN_WLEN];
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38 s->prev[s->nobs % _ROLLMEAN_WLEN] = value;
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39 s->nobs++;
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40 if (s->nobs < _ROLLMEAN_WLEN)
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41 s->mean = s->acc / s->nobs;
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42 else
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43 s->mean = s->acc / _ROLLMEAN_WLEN;
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44 }