* General Public License for more details.
*/
-package org.altusmetrum.altoslib_11;
+package org.altusmetrum.altoslib_13;
import java.util.*;
-public class AltosTimeSeries implements Iterable<AltosTimeValue> {
+public class AltosTimeSeries implements Iterable<AltosTimeValue>, Comparable<AltosTimeSeries> {
public String label;
public AltosUnits units;
ArrayList<AltosTimeValue> values;
+ boolean data_changed;
+
+ public int compareTo(AltosTimeSeries other) {
+ return label.compareTo(other.label);
+ }
public void add(AltosTimeValue tv) {
+ data_changed = true;
values.add(tv);
}
+ public void erase_values() {
+ data_changed = true;
+ this.values = new ArrayList<AltosTimeValue>();
+ }
+
+ public void clear_changed() {
+ data_changed = false;
+ }
+
+// public boolean changed() {
+// return data_changed;
+// }
+
public void add(double time, double value) {
add(new AltosTimeValue(time, value));
}
if (v0.time == v1.time)
return (v0.value + v1.value) / 2;
- return (v0.value * (v1.time - t) + v1.value * (t - v0.time)) / v1.time - v0.time;
+ return (v0.value * (v1.time - t) + v1.value * (t - v0.time)) / (v1.time - v0.time);
}
private int after_index(double time) {
/* Compute a value for an arbitrary time */
public double value(double time) {
int after = after_index(time);
- if (after == 0)
- return values.get(0).value;
- if (after == values.size())
- return values.get(after - 1).value;
+ double ret;
- return lerp(values.get(after-1), values.get(after), time);
+ if (after == 0)
+ ret = values.get(0).value;
+ else if (after == values.size())
+ ret = values.get(after - 1).value;
+ else {
+ AltosTimeValue b = values.get(after-1);
+ AltosTimeValue a = values.get(after);
+ ret = lerp(b, a, time);
+ }
+ return ret;
}
/* Find the value just before an arbitrary time */
return values.get(after).value;
}
+ public double time_of(double value) {
+ double last = AltosLib.MISSING;
+ for (AltosTimeValue v : values) {
+ if (v.value >= value)
+ return v.time;
+ last = v.time;
+ }
+ return last;
+ }
+
public int size() {
return values.size();
}
return values.iterator();
}
- public double max() {
- double max = AltosLib.MISSING;
+ public AltosTimeValue max() {
+ AltosTimeValue max = null;
+ for (AltosTimeValue tv : values)
+ if (max == null || tv.value > max.value)
+ max = tv;
+ return max;
+ }
+
+ public AltosTimeValue max(double start_time, double end_time) {
+ AltosTimeValue max = null;
for (AltosTimeValue tv : values) {
- if (max == AltosLib.MISSING || tv.value > max)
- max = tv.value;
+ if (start_time <= tv.time && tv.time <= end_time)
+ if (max == null || tv.value > max.value)
+ max = tv;
}
return max;
}
- public double min() {
- double min = AltosLib.MISSING;
+ public AltosTimeValue min() {
+ AltosTimeValue min = null;
+ for (AltosTimeValue tv : values) {
+ if (min == null || tv.value < min.value)
+ min = tv;
+ }
+ return min;
+ }
+
+ public AltosTimeValue min(double start_time, double end_time) {
+ AltosTimeValue min = null;
for (AltosTimeValue tv : values) {
- if (min == AltosLib.MISSING || tv.value < min)
- min = tv.value;
+ if (start_time <= tv.time && tv.time <= end_time)
+ if (min == null || tv.value < min.value)
+ min = tv;
}
return min;
}
+ public AltosTimeValue first() {
+ if (values.size() > 0)
+ return values.get(0);
+ return null;
+ }
+
+ public AltosTimeValue last() {
+ if (values.size() > 0)
+ return values.get(values.size() - 1);
+ return null;
+ }
+
+ public double average() {
+ double total_value = 0;
+ double total_time = 0;
+ AltosTimeValue prev = null;
+ for (AltosTimeValue tv : values) {
+ if (prev != null) {
+ total_value += (tv.value + prev.value) / 2 * (tv.time - prev.time);
+ total_time += (tv.time - prev.time);
+ }
+ prev = tv;
+ }
+ if (total_time == 0)
+ return AltosLib.MISSING;
+ return total_value / total_time;
+ }
+
+ public double average(double start_time, double end_time) {
+ double total_value = 0;
+ double total_time = 0;
+ AltosTimeValue prev = null;
+ for (AltosTimeValue tv : values) {
+ if (start_time <= tv.time && tv.time <= end_time) {
+ if (prev != null) {
+ total_value += (tv.value + prev.value) / 2 * (tv.time - start_time);
+ total_time += (tv.time - start_time);
+ }
+ start_time = tv.time;
+ }
+ prev = tv;
+ }
+ if (total_time == 0)
+ return AltosLib.MISSING;
+ return total_value / total_time;
+ }
+
public AltosTimeSeries integrate(AltosTimeSeries integral) {
double value = 0.0;
double pvalue = 0.0;
}
pvalue = v.value;
time = v.time;
-// System.out.printf("%g %g %g\n", time, v.value, value);
integral.add(time, value);
}
}
- private double filter_coeff(double dist, double width) {
- double ratio = dist / (width / 2);
+ private static double i0(double x) {
+ double ds = 1, d = 0, s = 0;
+
+ do {
+ d += 2;
+ ds = ds * (x * x) / (d * d);
+ s += ds;
+ } while (ds - 0.2e-8 * s > 0);
+ return s;
+ }
+
+ private static double kaiser(double n, double m, double beta) {
+ double alpha = m / 2;
+ double t = (n - alpha) / alpha;
+
+ if (t > 1 || t < -1)
+ t = 1;
+ double k = i0 (beta * Math.sqrt (1 - t*t)) / i0(beta);
+ return k;
+ }
- return Math.cos(ratio * Math.PI / 2);
+ private double filter_coeff(double dist, double width) {
+ return kaiser(dist + width/2.0, width, 2 * Math.PI);
}
public AltosTimeSeries filter(AltosTimeSeries f, double width) {
+
double half_width = width/2;
+ int half_point = values.size() / 2;
for (int i = 0; i < values.size(); i++) {
double center_time = values.get(i).time;
double left_time = center_time - half_width;
double j_right = j == right ? right_time : values.get(j+1).time;
double interval = (j_right - j_left) / 2.0;
double coeff = filter_coeff(j_time - center_time, width) * interval;
+ double value = values.get(j).value;
+ double partial = value * coeff;
total_coeff += coeff;
- total_value += coeff * values.get(j).value;
+ total_value += partial;
}
}
if (total_coeff != 0.0)
projects / fw / altos / blobdiff