sort of working

rowers/utils.py

@@ -378,3 +378,23 @@ def isprorower(r):
 
     return result
                                                                                      
+# Exponentially weighted moving average
+# Used for data smoothing of the jagged data obtained by Strava
+# See bitbucket issue 72
+def ewmovingaverage(interval,window_size):
+    # Experimental code using Exponential Weighted moving average
+
+    try:
+        intervaldf = pd.DataFrame({'v':interval})
+        idf_ewma1 = intervaldf.ewm(span=window_size)
+        idf_ewma2 = intervaldf[::-1].ewm(span=window_size)
+        
+        i_ewma1 = idf_ewma1.mean().ix[:,'v']
+        i_ewma2 = idf_ewma2.mean().ix[:,'v']
+
+        interval2 = np.vstack((i_ewma1,i_ewma2[::-1]))
+        interval2 = np.mean( interval2, axis=0) # average
+    except ValueError:
+        interval2 = interval
+
+    return interval2