Wrong value for Vertex degree

Key: SANDBOX337
URL: https://issues.apache.org/jira/browse/SANDBOX337
Project: Commons Sandbox
Issue Type: Bug
Components: Graph
Reporter: Marco Speranza
Priority: Minor
Hi folk, I'm doing a tests case for the class BaseMutableGraph, in order to upgrade our testcase
suite. I think that our implementation of vertex degree is wrong.
according with http://en.wikipedia.org/wiki/Glossary_of_graph_theory#Adjacency_and_degree
"The degree, or valency, dG(v) of a vertex v in a graph G is the number of edges incident
to v, with loops being counted twice. A vertex of degree 0 is an isolated vertex. A vertex
of degree 1 is a leaf. In the labelled simple graph example, vertices 1 and 3 have a degree
of 2, vertices 2, 4 and 5 have a degree of 3, and vertex 6 has a degree of 1. If E is finite,
then the total sum of vertex degrees is equal to twice the number of edges."
so for a complete graph with 5 nodes, each vertex has a degree of 4. Instead our implementation
returns 8.
IMHO this is wrong. WDYT?
Have a nice week end

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