Opened 7 months ago
Closed 7 months ago
#28451 closed defect (fixed)
eulerian_circuit broken for the graph with vertices but no edges
Reported by: | tmonteil | Owned by: | |
---|---|---|---|
Priority: | major | Milestone: | sage-8.9 |
Component: | graph theory | Keywords: | |
Cc: | Merged in: | ||
Authors: | Hendrik Schrezenmaier | Reviewers: | Thierry Monteil |
Report Upstream: | N/A | Work issues: | |
Branch: | bad58c6 (Commits) | Commit: | bad58c6d83ecacb9964cf47cac99290b4842dff4 |
Dependencies: | Stopgaps: |
Description (last modified by )
As deduced from this ask question:
sage: G = Graph() sage: G.add_vertex(0) sage: G Graph on 1 vertex sage: G.eulerian_circuit() --------------------------------------------------------------------------- StopIteration Traceback (most recent call last) <ipython-input-5-0c288f8b38d6> in <module>() ----> 1 G.eulerian_circuit() /opt/sagemath/sage-source/local/lib/python2.7/site-packages/sage/graphs/generic_graph.pyc in eulerian_circuit(self, return_vertices, labels, path) 4001 edges.append(e if labels else (e[0], e[1])) 4002 else: -> 4003 next_edge = next(g_edge_iter(v)) 4004 4005 if next_edge[0] == v: # in the undirected case we want to StopIteration:
See also:
sage: G = Graph() sage: G.add_vertices(range(10)) sage: G.eulerian_circuit() --------------------------------------------------------------------------- StopIteration Traceback (most recent call last) <ipython-input-27-0c288f8b38d6> in <module>() ----> 1 G.eulerian_circuit() /opt/sagemath/sage-source/local/lib/python2.7/site-packages/sage/graphs/generic_graph.pyc in eulerian_circuit(self, return_vertices, labels, path) 4001 edges.append(e if labels else (e[0], e[1])) 4002 else: -> 4003 next_edge = next(g_edge_iter(v)) 4004 4005 if next_edge[0] == v: # in the undirected case we want to StopIteration:
Change History (5)
comment:1 Changed 7 months ago by
- Description modified (diff)
- Summary changed from eulerian_circuit broken for the graph with a single vertex to eulerian_circuit broken for the graph with vertices but no edges
comment:2 Changed 7 months ago by
- Branch set to u/gh-hensc/eulerian_circuit_broken_for_the_graph_with_vertices_but_no_edges
comment:3 Changed 7 months ago by
- Commit set to bad58c6d83ecacb9964cf47cac99290b4842dff4
- Status changed from new to needs_review
- Type changed from enhancement to defect
comment:4 Changed 7 months ago by
- Reviewers set to Thierry Monteil
- Status changed from needs_review to positive_review
LGTM.
comment:5 Changed 7 months ago by
- Branch changed from u/gh-hensc/eulerian_circuit_broken_for_the_graph_with_vertices_but_no_edges to bad58c6d83ecacb9964cf47cac99290b4842dff4
- Resolution set to fixed
- Status changed from positive_review to closed
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New commits:
fixed bug and added doctest