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pythonnetworkxgraphlab

Dato-Graphlab Check if Edge exists

I've just installed Graphlab and am trying to convert NetworkX code to Graphlab. I'm having trouble finding in the Graphlab documentation the NetworkX equivalent of G.has_edge(). If a similar function does not exist, how would one check if an Graphlab Edge already exists in the Graph?

Solution

  • The SGraph.get_edges method can be used to check if a particular edge exists. In my example below I create a "chain" graph where vertices with consecutive integers are connected by an edge.

    >>> import graphlab
>>> g = graphlab.SGraph().add_edges(
        [graphlab.Edge(i, i+1) for i in range(4)])

# Edge does exist.
>>> test1 = g.get_edges(src_ids=[0], dst_ids=[1])
>>> test1.num_rows()
1

# Edge does *not* exist.
>>> test2 = g.get_edges(src_ids=[0], dst_ids=[2])
>>> test2.num_rows()
0

    Here's the link to the API docs for get_edges: https://dato.com/products/create/docs/generated/graphlab.SGraph.get_edges.html