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"""
Ego graph.
"""
# Copyright (C) 2010 by
# Aric Hagberg <hagberg@lanl.gov>
# Dan Schult <dschult@colgate.edu>
# Pieter Swart <swart@lanl.gov>
# All rights reserved.
# BSD license.
__author__ = """\n""".join(['Drew Conway <drew.conway@nyu.edu>',
'Aric Hagberg <hagberg@lanl.gov>'])
__all__ = ['ego_graph']
def ego_graph(G,n,center=True):
"""Returns induced subgraph of neighbors centered at node n.
Parameters
----------
G : graph
A NetworkX Graph or DiGraph
n : node
A single node
center : bool, optional
If False, do not include center node in graph
"""
nodes=set([n]) # add center node
nodes.update(G.neighbors(n)) # extend with neighbors
H=G.subgraph(nodes)
if not center:
H.remove_node(n)
return H
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