1 files changed, 81 insertions, 0 deletions
diff --git a/ao-tools/lib/cc-integrate.c b/ao-tools/lib/cc-integrate.c
new file mode 100644
index 00000000..ba50761b
--- /dev/null
+++ b/ao-tools/lib/cc-integrate.c
@@ -0,0 +1,81 @@
+/*
+ * 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;
+}