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#include "measurement.h"
double add_to_avg(double mx, double x, count_t n) {
return mx * (n / (n + 1.0)) + x / (n + 1.0);
}
void meas_update(meas_t *m, double x) {
count_t n = m->n;
m->x = add_to_avg(m->x, x, n);
m->x2 = add_to_avg(m->x2, pow(x, 2), n);
m->m2 = add_to_avg(m->m2, pow(x - m->x, 2), n);
m->m4 = add_to_avg(m->m4, pow(x - m->x, 4), n);
/*
if (n > 1) {
double s2 = n / (n - 1.) * (m->x2 - pow(m->x, 2));
m->dx = sqrt(s2 / n);
m->c = s2;
m->dc = sqrt((m->m4 - (n - 3.)/(n - 1.) * pow(m->m2, 2)) / n);
}
*/
(m->n)++;
}
double meas_dx(const meas_t *m) {
return sqrt(1. / (m->n - 1.) * (m->x2 - pow(m->x, 2)));
}
double meas_c(const meas_t *m) {
return m->n / (m->n - 1.) * (m->x2 - pow(m->x, 2));
}
double meas_dc(const meas_t *m) {
return sqrt((m->m4 - (m->n - 3.)/(m->n - 1.) * pow(m->m2, 2)) / m->n);
}
void update_autocorr(autocorr_t *OO, double O) {
OO->O = add_to_avg(OO->O, O, OO->n);
OO->O2 = add_to_avg(OO->O2, pow(O, 2), OO->n);
dll_t *Otmp = OO->Op;
dll_t *Osave;
count_t t = 0;
while (Otmp != NULL) {
OO->OO[t] = add_to_avg(OO->OO[t], O * (Otmp->x), OO->n - t - 1);
t++;
if (t == OO->W - 1) {
Osave = Otmp;
}
Otmp = Otmp->next;
}
if (t == OO->W) {
if (OO->W == 1) {
free(OO->Op);
OO->Op = NULL;
} else {
free(Osave->next);
Osave->next = NULL;
}
}
stack_push_d(&(OO->Op), O);
OO->n++;
}
double rho(const autocorr_t *o, count_t i) {
return (o->OO[i] - pow(o->O, 2)) / (o->O2 - pow(o->O, 2));
}
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