# HG changeset patch
# User Jeff Hammel <k0scist@gmail.com>
# Date 1513547077 28800
# Node ID 990a27e125f2eb6876dceca92915e996880b7213
# Parent  3c7927f59b05ad3e6610e60994e8aa3e1b9d31e9
add distance norm function

diff -r 3c7927f59b05 -r 990a27e125f2 tvii/distance.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tvii/distance.py	Sun Dec 17 13:44:37 2017 -0800
@@ -0,0 +1,8 @@
+"""
+distance functions; really the `N` norm
+"""
+
+def distance(x, y, N=2):
+    assert len(x) == len(y)
+    return sum([(_x - _y)**N
+                for _x, _y in zip(x, y)])**(1./N)