cone/doubly_nonnegative.py: use xrange in two places.

diff --git a/mjo/cone/doubly_nonnegative.py b/mjo/cone/doubly_nonnegative.py
index f0d2a62b6e9223d3ca5539dab9768e2b6d2367e9..92184d15c4133e33f04e877352787378ae3739df 100644 (file)
--- a/mjo/cone/doubly_nonnegative.py
+++ b/mjo/cone/doubly_nonnegative.py
@@ -369,8 +369,8 @@ def is_extreme_doubly_nonnegative(A):
     # whenever we come across an index pair `$(i,j)$` with
     # `$A_{ij} = 0$`.
     spanning_set = []
-    for j in range(0, A.ncols()):
-        for i in range(0,j):
+    for j in xrange(A.ncols()):
+        for i in xrange(j):
             if A[i,j] == 0:
                 M = A.matrix_space()
                 S = X.transpose() * (stdE(M,i,j) + stdE(M,j,i)) * X