periphery

periphery(G, e=None, usebounds=False, weight=None)

Returns the periphery of the graph G.

The periphery is the set of nodes with eccentricity equal to the diameter.

Parameters:

GNetworkX graph

A graph

eeccentricity dictionary, optional

A precomputed dictionary of eccentricities.

weightstring, function, or None

If this is a string, then edge weights will be accessed via the edge attribute with this key (that is, the weight of the edge joining u to v will be G.edges[u, v][weight]). If no such edge attribute exists, the weight of the edge is assumed to be one.

If this is a function, the weight of an edge is the value returned by the function. The function must accept exactly three positional arguments: the two endpoints of an edge and the dictionary of edge attributes for that edge. The function must return a number.

If this is None, every edge has weight/distance/cost 1.

Weights stored as floating point values can lead to small round-off errors in distances. Use integer weights to avoid this.

Weights should be positive, since they are distances.

Returns:

plist

List of nodes in periphery

See also

barycenter

center

Examples

>>> G = nx.Graph([(1, 2), (1, 3), (1, 4), (3, 4), (3, 5), (4, 5)])
>>> nx.periphery(G)
[2, 5]