+int
+cc_timedata_max_mag(struct cc_timedata *d, double min_time, double max_time)
+{
+ int i;
+ double max;
+ int max_i = -1;
+ int set = 0;
+
+ if (d->num == 0)
+ return -1;
+ for (i = 0; i < d->num; i++)
+ if (min_time <= d->data[i].time && d->data[i].time <= max_time)
+ if (!set || fabs(d->data[i].value) > max) {
+ max_i = i;
+ max = fabs(d->data[i].value);
+ set = 1;
+ }
+ return max_i;
+}
+
+double
+cc_timedata_average(struct cc_timedata *td, double start_time, double stop_time)
+{
+ int i;
+ double prev_time;
+ double next_time;
+ double interval;
+ double sum = 0.0;
+ double period = 0.0;
+
+ prev_time = start_time;
+ for (i = 0; i < td->num; i++) {
+ if (start_time <= td->data[i].time && td->data[i].time <= stop_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;
+ sum += td->data[i].value * interval;
+ period += interval;
+ prev_time = next_time;
+ }
+ }
+ return sum / period;
+}
+
+int
+cc_perioddata_limits(struct cc_perioddata *d, double min_time, double max_time, int *start, int *stop)
+{
+ double start_d, stop_d;
+
+ if (d->num == 0)
+ return 0;
+ start_d = ceil((min_time - d->start) / d->step);
+ if (start_d < 0)
+ start_d = 0;
+ stop_d = floor((max_time - d->start) / d->step);
+ if (stop_d >= d->num)
+ stop_d = d->num - 1;
+ if (stop_d < start_d)
+ return 0;
+ *start = (int) start_d;
+ *stop = (int) stop_d;
+ return 1;
+}
+