From 513077aa25c049eaee0b614fb3cca70888d6a140 Mon Sep 17 00:00:00 2001
From: Fred Pauchet <fred@grimbox.be>
Date: Tue, 28 Feb 2017 21:22:35 +0100
Subject: [PATCH] add a method to compute the differences between two measures.

---
 heima/sherlock/models.py | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/heima/sherlock/models.py b/heima/sherlock/models.py
index 0d31e3d..e19c06d 100644
--- a/heima/sherlock/models.py
+++ b/heima/sherlock/models.py
@@ -21,10 +21,21 @@ class Gauge(models.Model):
 
 
 class DiffMeasure(object):
+    """Takes two measures and compute the differences between them.
+
+    Attribues:
+        increase (decimal): the increase between the lowest value and the highest.
+        timedelta (timespan): the elapsed time between the two values.
+    """
     def __init__(self, measure_1, measure_2):
         self.increase = abs(measure_1.diff(measure_2))
         self.timedelta = abs(measure_1.moment - measure_2.moment)
 
+    def daily_average_increase(self):
+        """Returns the daily average increase, based on the two initial measures.
+        """
+        return self.increase / self.timedelta.days
+
 
 def diff_from_measures(measure1, measure2):
     """Generate the diff between the two measures.