# HG changeset patch
# User Nathann Cohen
# Date 1327499848 -3600
# Node ID dd2fbcac6842ed3108b6e07d1aad5a552b4e5000
# Parent 326e715d2cfe4a3fb31752776802894248bb20d2
trac #11754 -- A warning int he rankwidth code
diff --git a/sage/graphs/graph.py b/sage/graphs/graph.py
--- a/sage/graphs/graph.py
+++ b/sage/graphs/graph.py
@@ -2969,7 +2969,7 @@
INPUT:
- ``verbose`` (boolean) -- whether to display progress information while
- computing the decomposition.
+ computing the decomposition.
OUTPUT:
diff --git a/sage/graphs/graph_decompositions/rankwidth.pyx b/sage/graphs/graph_decompositions/rankwidth.pyx
--- a/sage/graphs/graph_decompositions/rankwidth.pyx
+++ b/sage/graphs/graph_decompositions/rankwidth.pyx
@@ -1,5 +1,5 @@
r"""
-Rank Decompositions of graphs.
+Rank Decompositions of graphs
This modules wraps a C code from Philipp Klaus Krause computing a an optimal
rank-decomposition [RWKlause]_.
@@ -68,7 +68,12 @@
.. WARNING::
- The current implementation cannot handle graphs of `\geq 32` vertices.
+ * The current implementation cannot handle graphs of `\geq 32` vertices.
+
+ * A bug that has been reported upstream make the code crash immediately on
+ instances of size `30`. If you experience this kind of bug please report
+ it to us, what we need is some information on the hardware you run to know
+ where it comes from !
EXAMPLE::