From 597398a34bb7a275ba8160e08690f356072be985 Mon Sep 17 00:00:00 2001
From: Wirawan Purwanto <wirawan0@gmail.com>
Date: Thu, 29 May 2014 13:55:05 -0400
Subject: [PATCH] * Added missing function (rms).

---
 math/stats/array_stats.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/math/stats/array_stats.py b/math/stats/array_stats.py
index 6057eb1..f87c239 100644
--- a/math/stats/array_stats.py
+++ b/math/stats/array_stats.py
@@ -33,6 +33,10 @@ PRINCIPLES
   statement.
 """
 
+def rms(m):
+  return numpy.sqrt(numpy.sum(m**2) / m.size)
+
+
 def report_diff_stat(M1, M2, out=sys.stdout):
   # Original function name: statdiff
   """Studies the difference of two arrays (or matrices).