--- a/python/moving.py	Fri Apr 24 17:02:47 2015 +0200
+++ b/python/moving.py	Thu May 07 13:25:31 2015 +0200
@@ -1155,7 +1155,27 @@
             plot(list(self.getTimeInterval()), speeds)
 
     @staticmethod
+    def minMaxDistance(obj1, obj2):
+        '''Computes the min max distance used for feature grouping'''
+        commonTimeInterval = obj1.commonTimeInterval(obj2)
+        if not commonTimeInterval.empty():
+            minDistance = (obj1.getPositionAtInstant(commonTimeInterval.first)-obj2.getPositionAtInstant(commonTimeInterval.first)).norm2()
+            maxDistance = minDistance
+            for t in list(commonTimeInterval)[1:]:
+                d = (obj1.getPositionAtInstant(t)-obj2.getPositionAtInstant(t)).norm2()
+                if d<minDistance:
+                    minDistance = d
+                elif d>maxDistance:
+                    maxDistance = d
+            return int(commonTimeInterval.length()), minDistance, maxDistance
+        else:
+            return int(commonTimeInterval.length()), None, None
+
+    @staticmethod
     def distances(obj1, obj2, instant1, _instant2 = None):
+        '''Returns the distances between all features of the 2 objects 
+        at the same instant instant1
+        or at instant1 and instant2'''
         from scipy.spatial.distance import cdist
         if _instant2 is None:
             instant2 = instant1