Zero division bug

resources/elasticsearch-oculus-plugin/com/etsy/oculus/tsscorers/DTWScript.java

@@ -63,10 +63,15 @@ public ArrayList scaleArrayList(ArrayList a, Double scalepoints){
       ArrayList scaled = new ArrayList();
       Double min_value = (Double) Collections.min(a);
       Double max_value = (Double) Collections.max(a);
-
-      for (int i = 0; i < a.size(); i++) {
-          scaled.add(((scalepoints/(max_value-min_value)) * ((Double) a.get(i)-min_value)));
-      };
-      return scaled;
+
+      if (min_value == max_value) {
+          for (int i = 0; i < a.size(); i++)
+              scaled.add(1.0);
+       } else {
+          for (int i = 0; i < a.size(); i++)
+              scaled.add(((scalepoints / (max_value - min_value)) * ((Double) a.get(i) - min_value)));
+       }
+
+       return scaled;
     }
-}
+}