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/*
* Copyright © 2009 Keith Packard <keithp@keithp.com>
*
* This program 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; version 2 of the License.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "cc.h"
#include <stdlib.h>
struct cc_timedata *
cc_timedata_convert(struct cc_timedata *d, double (*f)(double v, double a), double a)
{
struct cc_timedata *r;
int n;
r = calloc (1, sizeof (struct cc_timedata));
r->num = d->num;
r->size = d->num;
r->data = calloc (r->size, sizeof (struct cc_timedataelt));
r->time_offset = d->time_offset;
for (n = 0; n < d->num; n++) {
r->data[n].time = d->data[n].time;
r->data[n].value = f(d->data[n].value, a);
}
return r;
}
struct cc_timedata *
cc_timedata_integrate(struct cc_timedata *d, double min_time, double max_time)
{
struct cc_timedata *i;
int n, m;
int start, stop;
cc_timedata_limits(d, min_time, max_time, &start, &stop);
i = calloc (1, sizeof (struct cc_timedata));
i->num = stop - start + 1;
i->size = i->num;
i->data = calloc (i->size, sizeof (struct cc_timedataelt));
i->time_offset = d->data[start].time;
for (n = 0; n < i->num; n++) {
m = n + start;
i->data[n].time = d->data[m].time;
if (n == 0) {
i->data[n].value = 0;
} else {
i->data[n].value = i->data[n-1].value +
(d->data[m].value + d->data[m-1].value) / 2 *
((d->data[m].time - d->data[m-1].time) / 100.0);
}
}
return i;
}
struct cc_perioddata *
cc_perioddata_differentiate(struct cc_perioddata *i)
{
struct cc_perioddata *d;
int n;
d = calloc (1, sizeof (struct cc_perioddata));
d->num = i->num;
d->start = i->start;
d->step = i->step;
d->data = calloc (d->num, sizeof(double));
for (n = 1; n < d->num; n++)
d->data[n] = (i->data[n] - i->data[n-1]) / (i->step / 100.0);
d->data[0] = d->data[1];
return d;
}
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