#15665: Error with edges in empty immutable graph
----------------------------+----------------------------
Reporter: tscrim | Owner: tscrim
Type: defect | Status: new
Priority: major | Milestone: sage-6.1
Component: graph theory | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
----------------------------+----------------------------
Using the default backend, it works:
{{{
sage: Graph().edges()
[]
}}}
but making the graph immutable does not:
{{{
sage: Graph(immutable=True).edges()
---------------------------------------------------------------------------
ValueError Traceback (most recent call
last)
<ipython-input-10-140959f52625> in <module>()
----> 1 Graph(immutable=True).edges()
/home/travis/sage/local/lib/python2.7/site-
packages/sage/graphs/generic_graph.pyc in edges(self, labels, sort, key)
9397 if not(sort) and key:
9398 raise ValueError('sort keyword is False, yet a key
function is given')
-> 9399 L = list(self.edge_iterator(labels=labels))
9400 if sort:
9401 L.sort(key=key)
/home/travis/sage/local/lib/python2.7/site-
packages/sage/graphs/base/static_sparse_backend.so in iterator_edges
(sage/graphs/base/static_sparse_backend.c:7820)()
/home/travis/sage/local/lib/python2.7/site-packages/sage/misc/bitset.so in
sage.misc.bitset.FrozenBitset.__init__ (sage/misc/bitset.c:5548)()
ValueError: Bitsets must not be empty
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/15665>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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