Hmm. I could reproduce this. Looks like gt somehow ignores that out_degree is 0 and is counting it to be 3 (which is actually in-degree). Then the maximum number of links among neighbours would be at most 3C2 = 3 but actually 6 are present. So it simply takes the ration 6/3 = 2. Tiago would be able to say more about this though.

Best

Snehal

On Wed, Oct 19, 2016 at 9:47 PM, P-M <pmj27@cam.ac.uk> wrote:

Here is a more helpful visualisation with the vertices labelled:
<http://main-discussion-list-for-the-graph-tool-project.982480.n3.nabble.com/file/n4026785/clust.png>

So the issue lies with vertex 0 which has an outdegree of 0 and an indegree
of 3 but a clustering coefficient of 2.

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Snehal Madhukar Shekatkar
Pune
India