This documents an unmaintained version of NetworkX. Please upgrade to a maintained version and see the current NetworkX documentation.


ego_graph(G, n, radius=1, center=True, undirected=False, distance=None)[source]

Returns induced subgraph of neighbors centered at node n within a given radius.

Parameters :

G : graph

A NetworkX Graph or DiGraph

n : node

A single node

radius : number, optional

Include all neighbors of distance<=radius from n.

center : bool, optional

If False, do not include center node in graph

undirected : bool, optional

If True use both in- and out-neighbors of directed graphs.

distance : key, optional

Use specified edge data key as distance. For example, setting distance=’weight’ will use the edge weight to measure the distance from the node n.


For directed graphs D this produces the “out” neighborhood or successors. If you want the neighborhood of predecessors first reverse the graph with D.reverse(). If you want both directions use the keyword argument undirected=True.

Node, edge, and graph attributes are copied to the returned subgraph.