#8395: degree() reports the degree of a self-loop vertex as contributing 1 to
total degree
----------------------------+-----------------------------------------------
Reporter: mvngu | Owner: rlm
Type: defect | Status: new
Priority: minor | Milestone: sage-4.3.4
Component: graph theory | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
----------------------------+-----------------------------------------------
From [http://groups.google.com/group/sage-
devel/browse_thread/thread/42110dbb598d11d2 sage-devel]:
{{{
[mv...@sage mvngu]$ sage
----------------------------------------------------------------------
| Sage Version 4.3.3, Release Date: 2010-02-21 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
sage: G = Graph({1:[1]}); G
Looped graph on 1 vertex
sage: sum(G.degree())
1
sage: G.size()
0
sage: G = Graph({1:[1]}, loops=True); G
Looped graph on 1 vertex
sage: sum(G.degree())
1
sage: G.size()
0
sage: G = Graph({1:[1]}, loops=True, multiedges=True); G
Looped multi-graph on 1 vertex
sage: sum(G.degree())
1
sage: G.size()
0
The size of G is 1 because there is one edge, i.e. the single
self-loop. As shown by the above session, Sage reports the size of G
as 0. I believe this is a bug.
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8395>
Sage <http://www.sagemath.org>
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