Hi,
I created a small world graph using:
igraph_watts_strogatz_game(&graph, 1, 20, 4, 0.3);
but when I inspected the neighbors of node with pnode=1 by
igraph_neighbors(&graph, &neis, 1, IGRAPH_ALL);
...
for (int i=0;i<igraph_vector_size(&neis);++i)
cout << VECTOR(neis)[i] << ' ';
I got the output
3 5 5 9 11 16 17 18.
Why are there two 5's? I remember that duplicate edges are forbidden in
the paper by Watts and Strogatz.
Wu Degang
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