From: Michael Orlitzky <michael@orlitzky.com>
Date: Wed, 5 Oct 2016 15:55:36 +0000 (-0400)
Subject: Add a norm function to the matrices module.
X-Git-Tag: 0.1.0~217
X-Git-Url: http://gitweb.michael.orlitzky.com/?a=commitdiff_plain;h=a874fc5af210e969c3191e74a4bf0b4301894df2;p=dunshire.git

Add a norm function to the matrices module.
---

diff --git a/matrices.py b/matrices.py
index 82944ee..60db346 100644
--- a/matrices.py
+++ b/matrices.py
@@ -1,4 +1,5 @@
 from cvxopt import matrix, spmatrix
+from math import sqrt
 
 def append_col(A,b):
     """
@@ -17,3 +18,9 @@ def identity(n):
     Return the ``n``-by-``n`` identity matrix.
     """
     return spmatrix(1,range(n),range(n))
+
+def norm(x):
+    """
+    Return the Euclidean norm of the given vector.
+    """
+    return sqrt(sum([z**2 for z in x]))