[chronojump] Force sensor: better repetitions cut

[Xavier de Blas <xaviblas src gnome org>]

commit 3235142568e409ca30cd8d693593f9c637581e12
Author: Xavier de Blas <xaviblas gmail com>
Date:   Mon Feb 17 12:16:18 2020 +0100

    Force sensor: better repetitions cut

 src/forceSensorDynamics.cs | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)
---
diff --git a/src/forceSensorDynamics.cs b/src/forceSensorDynamics.cs
index 72fd99f3..0bfdbed0 100644
--- a/src/forceSensorDynamics.cs
+++ b/src/forceSensorDynamics.cs
@@ -195,21 +195,25 @@ public abstract class ForceSensorDynamics
        {
                // 1) remove low force at beginning ot end of the repetition
                double maxAbs = 0;
-               foreach(double y in yList)
-                       if (Math.Abs(y) > maxAbs)
-                               maxAbs = Math.Abs(y);
 
-               //create List with absolute values
+               //List with absolute values
                List<double> yListAbs = new List<double>();
+
+               //List with absolute values reversed to find end of rep
+               List<double> yListAbsRev = new List<double>();
+
                for(int i = 0; i < yList.Count ; i ++)
-                       yListAbs.Add(yList[i]);
+               {
+                       double abs = Math.Abs(yList[i]);
+                       yListAbs.Add(abs);
+                       if (abs > maxAbs)
+                               maxAbs = abs;
+               }
 
                sampleStart = findLocalExtreme(yListAbs, sampleStart, sampleEnd, maxAbs);
 
-               //create List with absolute values reversed to find end of rep
-               List<double> yListAbsRev = new List<double>();
                for(int i = yListAbs.Count -1; i >= 0 ; i --)
-                       yListAbsRev.Add(yList[i]);
+                       yListAbsRev.Add(yListAbs[i]);
 
                sampleEnd = yList.Count - findLocalExtreme(yListAbsRev,
                                yList.Count - sampleEnd, yList.Count - sampleStart, maxAbs);
@@ -248,8 +252,8 @@ public abstract class ForceSensorDynamics
                                yList.Count, sampleStart, sampleEnd, maxAbs));
 
                int i = sampleStart;
-               //threshold for "non-force" segment at 5% of max
-               while(Math.Abs(yList[i]) < .05 * maxAbs && i < sampleEnd)
+               //threshold for "non-force" segment at 2.5% of max
+               while(Math.Abs(yList[i]) < .025 * maxAbs && i < sampleEnd)
                        i ++;
 
                //find the lowest value at 70% end of the "non-force" segment