Opened 11 years ago
Last modified 7 years ago
#9807 new defect
merge_vertices behavior in a graph with loops
Reported by: | tobiasljohnson | Owned by: | jason, ncohen, rlm |
---|---|---|---|
Priority: | minor | Milestone: | sage-6.4 |
Component: | graph theory | Keywords: | merge_vertices, loops |
Cc: | brunellus | Merged in: | |
Authors: | Reviewers: | ||
Report Upstream: | N/A | Work issues: | |
Branch: | Commit: | ||
Dependencies: | Stopgaps: |
Description
Suppose G is a graph with loops permitted containing the edge (0, 1). I would expect that G.merge_vertices([0, 1]) would create a loop (0, 0), but it doesn't:
sage: G = Graph(loops = True) sage: G.add_edge(0, 1) sage: G.merge_vertices([0, 1]) sage: G.edges() []
I think either we should change this, or we should write explicitly in the documentation that merge_vertices doesn't create self-loops even when G allows them.
Change History (6)
comment:1 Changed 10 years ago by
- Cc brunellus added
comment:2 Changed 10 years ago by
comment:3 Changed 8 years ago by
- Milestone changed from sage-5.11 to sage-5.12
comment:4 Changed 8 years ago by
- Milestone changed from sage-6.1 to sage-6.2
comment:5 Changed 7 years ago by
- Milestone changed from sage-6.2 to sage-6.3
comment:6 Changed 7 years ago by
- Milestone changed from sage-6.3 to sage-6.4
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See #7304.