X-Git-Url: http://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=mjo%2Fcone%2Fdoubly_nonnegative.py;h=1fb350cb46559a55b982ee3de15678e02d5a04de;hb=b760d6ffe2554def684bf1118fff22072b8cf781;hp=9dcae61856e6e9d5bda7f689cadf905de27290ac;hpb=fe9ce8d587b741f3094af4a6c98c7b41811318af;p=sage.d.git

diff --git a/mjo/cone/doubly_nonnegative.py b/mjo/cone/doubly_nonnegative.py
index 9dcae61..1fb350c 100644
--- a/mjo/cone/doubly_nonnegative.py
+++ b/mjo/cone/doubly_nonnegative.py
@@ -530,7 +530,7 @@ def random_extreme_doubly_nonnegative(V, accept_zero=True, rank=None):
 
     """
 
-    if not is_admissible_extreme_rank(rank, V.dimension()):
+    if rank is not None and not is_admissible_extreme_rank(rank, V.dimension()):
         msg = 'Rank %d not possible in dimension %d.'
         raise ValueError(msg % (rank, V.dimension()))