61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* rs.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: jhalford <jack@crans.org> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2017/10/07 17:57:54 by jhalford #+# #+# */
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/* Updated: 2017/10/07 18:19:47 by jhalford ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "libft.h"
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#include <math.h>
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double sqrt(double x);
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void rs_init(t_rs *rs)
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{
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bzero(rs, sizeof(t_rs));
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rs->count = 0;
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rs->min = DBL_MAX;
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rs->max = -DBL_MAX;
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}
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void rs_push(t_rs *rs, double n)
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{
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double delta;
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rs->count++;
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n < rs->min ? rs->min = n : (0);
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n > rs->max ? rs->max = n : (0);
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if (rs->count == 1)
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{
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rs->avg = n;
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rs->m = 0;
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}
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else
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{
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delta = n - rs->avg;
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rs->avg += delta / rs->count;
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rs->m += delta * (n - rs->avg);
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}
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}
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void rs_final(t_rs *rs)
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{
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if (rs->count == 0)
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{
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rs->min = 0;
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rs->max = 0;
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}
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if (rs->count < 2)
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{
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rs->var = 0;
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rs->stdev = 0;
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return ;
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}
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rs->var = rs->m / (rs->count - 1);
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rs->stdev = sqrt(rs->var);
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}
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