Distance
========

>>> import networkx as NX
>>> from networkx.operators import convert_node_labels_to_integers as cnlti
>>> G=cnlti(NX.grid_2d_graph(4,4),first_label=1,ordering="sorted")

    .. image:: paths_G.png


Eccentricity, diameter, etc.
----------------------------

>>> NX.eccentricity(G,1)
6
>>> e=NX.eccentricity(G,with_labels=True)
>>> e[1]
6
>>> NX.diameter(G)
6
>>> NX.radius(G)
4
>>> NX.periphery(G)
[1, 4, 13, 16]
>>> NX.center(G)
[6, 7, 10, 11]

>>> G=NX.Graph()
>>> G.add_edge(1,2)
>>> G.add_edge(3,4)
>>> NX.diameter(G)
Traceback (most recent call last):
...
NetworkXError: Graph not connected: infinite path length
>>> NX.radius(G)
Traceback (most recent call last):
...
NetworkXError: Graph not connected: infinite path length
>>> NX.eccentricity(G)
Traceback (most recent call last):
...
NetworkXError: Graph not connected: infinite path length