From 3f43124d8f5642c8d41e0a5169a43ca3d94d03c6 Mon Sep 17 00:00:00 2001
From: Stefan van der Walt <stefan@sun.ac.za>
Date: Fri, 19 Feb 2010 10:14:22 +0200
Subject: [PATCH] resolve: ordering: Mention that inverse of permutation matrix
 is transpose.

---
 supreme/resolve/ordering.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/supreme/resolve/ordering.py b/supreme/resolve/ordering.py
index 76eef16..f5022df 100644
--- a/supreme/resolve/ordering.py
+++ b/supreme/resolve/ordering.py
@@ -21,6 +21,11 @@ def special_form(A):
     P : sparse matrix
         Permutation matrix such that PA is in special form.
 
+    Notes
+    -----
+    The permutation matrix is orthogonal, and as such its
+    inverse is simply ``P.T``.
+
     """
     if not sparse.issparse(A):
         A = sparse.csr_matrix(A)