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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_perioddata *
cc_period_make(struct cc_timedata *td, double start_time, double stop_time)
{
int len = stop_time - start_time + 1;
struct cc_perioddata *pd;
int i;
double prev_time;
double next_time;
double interval;
pd = calloc(1, sizeof (struct cc_perioddata));
pd->start = start_time;
pd->step = 1;
pd->num = len;
pd->data = calloc(len, sizeof(double));
prev_time = start_time;
for (i = 0; i < td->num; i++) {
if (start_time <= td->data[i].time && td->data[i].time <= stop_time) {
int pos = td->data[i].time - start_time;
if (i < td->num - 1 && td->data[i+1].time < stop_time)
next_time = (td->data[i].time + td->data[i+1].time) / 2.0;
else
next_time = stop_time;
interval = next_time - prev_time;
pd->data[pos] = td->data[i].value * interval;
prev_time = next_time;
}
}
return pd;
}
struct cc_perioddata *
cc_period_low_pass(struct cc_perioddata *raw, double omega_pass, double omega_stop, double error)
{
struct cc_perioddata *filtered;
filtered = calloc (1, sizeof (struct cc_perioddata));
filtered->start = raw->start;
filtered->step = raw->step;
filtered->num = raw->num;
filtered->data = cc_low_pass(raw->data, raw->num, omega_pass, omega_stop, error);
return filtered;
}
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