python - iGraph: selecting vertices connected to -


suppose have following graph:

g = ig.graph([(0,1), (0,2), (2,3), (3,4), (4,2), (2,5), (5,0), (6,3), (5,6)], directed=false) g.vs["name"] = ["alice", "bob", "claire", "dennis", "esther", "frank", "george"]

and wish see bob connected to. bob connected 1 person alice. if try find edge :

g.es.select(_source=1) >>> <igraph.edgeseq @ 0x7f15ece78050>

i above response. how infer vertex index above. or if isn't possible, how find vertices connected bob?

this seems work. keyword arguments consist of property, e.g _source , _target, , operator e.g eq (=). , seems need check both source , target of edges (even it's undirected graph), after filtering edges, can use list comprehension loop through edges , extract source or target:

connected_from_bob = [edge.target edge in g.es.select(_source_eq=1)] connected_to_bob = [edge.source edge in g.es.select(_target_eq=1)]  connected_from_bob # []  connected_to_bob # [0]

then vertices connected bob union of 2 lists:

connected_with_bob = connected_from_bob + connected_to_bob

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