#13254: compute fundamental groups of simplicial complexes
--------------------------------------+-------------------------------------
Reporter: jhpalmieri | Owner: jhpalmieri
Type: enhancement | Status: needs_review
Priority: minor | Milestone: sage-5.7
Component: algebraic topology | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers: mmarco
Authors: John Palmieri | Merged in:
Dependencies: #12339 | Stopgaps:
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Comment (by mmarco):
Looks good to me. By checking this i discovered something the shouldn't
happen, but it has nothing to do with this ticket:
{{{
sage: F=simplicial_complexes.Sphere(0)
sage: F.connected_component()
---------------------------------------------------------------------------
LookupError Traceback (most recent call
last)
<ipython-input-48-5cd541b6e495> in <module>()
----> 1 F.connected_component()
/home/mmarco/sage-5.7.beta3/local/lib/python2.7/site-
packages/sage/homology/simplicial_complex.pyc in connected_component(self,
simplex)
2911 else:
2912 v = simplex[0]
-> 2913 vertices =
self.graph().connected_component_containing_vertex(v)
2914 facets = [f for f in self.facets() if
f.is_face(Simplex(vertices))]
2915 return SimplicialComplex(facets)
/home/mmarco/sage-5.7.beta3/local/lib/python2.7/site-
packages/sage/graphs/generic_graph.pyc in
connected_component_containing_vertex(self, vertex)
3894 """
3895 try:
-> 3896 c = list(self._backend.depth_first_search(vertex,
ignore_direction=True))
3897 except AttributeError:
3898 c = list(self.depth_first_search(vertex,
ignore_direction=True))
/home/mmarco/sage-5.7.beta3/local/lib/python2.7/site-
packages/sage/graphs/base/c_graph.so in
sage.graphs.base.c_graph.CGraphBackend.depth_first_search
(sage/graphs/base/c_graph.c:17312)()
/home/mmarco/sage-5.7.beta3/local/lib/python2.7/site-
packages/sage/graphs/base/c_graph.so in
sage.graphs.base.c_graph.Search_iterator.__init__
(sage/graphs/base/c_graph.c:19227)()
LookupError: Vertex (0) is not a vertex of the graph.
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13254#comment:7>
Sage <http://www.sagemath.org>
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