X-Git-Url: https://git.gag.com/?p=fw%2Faltos;a=blobdiff_plain;f=altoslib%2FAltosTimeSeries.java;h=75225e1558d236ae45bdd34e72509fcce48905ab;hp=5cf46c9ab888038ca2dd937aafdbcb1d340b2839;hb=fab890328d4e1151932621a317226bc291b853da;hpb=43f8470dc66392dae4770882bfc6ad25b1d75436

diff --git a/altoslib/AltosTimeSeries.java b/altoslib/AltosTimeSeries.java
index 5cf46c9a..75225e15 100644
--- a/altoslib/AltosTimeSeries.java
+++ b/altoslib/AltosTimeSeries.java
@@ -12,7 +12,7 @@
  * General Public License for more details.
  */
 
-package org.altusmetrum.altoslib_11;
+package org.altusmetrum.altoslib_13;
 
 import java.util.*;
 
@@ -20,15 +20,30 @@ public class AltosTimeSeries implements Iterable<AltosTimeValue>, Comparable<Alt
 	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));
 	}
@@ -150,30 +165,51 @@ public class AltosTimeSeries implements Iterable<AltosTimeValue>, Comparable<Alt
 		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 = 0;
-		int count = 0;
+		double total_value = 0;
+		double total_time = 0;
+		AltosTimeValue prev = null;
 		for (AltosTimeValue tv : values) {
-			total += tv.value;
-			count++;
+			if (prev != null) {
+				total_value += (tv.value + prev.value) / 2 * (tv.time - prev.time);
+				total_time += (tv.time - prev.time);
+			}
+			prev = tv;
 		}
-		if (count == 0)
+		if (total_time == 0)
 			return AltosLib.MISSING;
-		return total / count;
+		return total_value / total_time;
 	}
 
 	public double average(double start_time, double end_time) {
-		double total = 0;
-		int count = 0;
+		double total_value = 0;
+		double total_time = 0;
+		AltosTimeValue prev = null;
 		for (AltosTimeValue tv : values) {
 			if (start_time <= tv.time && tv.time <= end_time) {
-				total += tv.value;
-				count++;
+				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 (count == 0)
+		if (total_time == 0)
 			return AltosLib.MISSING;
-		return total / count;
+		return total_value / total_time;
 	}
 
 	public AltosTimeSeries integrate(AltosTimeSeries integral) {
@@ -243,14 +279,35 @@ public class AltosTimeSeries implements Iterable<AltosTimeValue>, Comparable<Alt
 
 	}
 
-	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;
+	}
 
-		return Math.cos(ratio * Math.PI / 2);
+	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;
+	}
+
+	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;