node_boundary¶

node_boundary(G, nbunch1, nbunch2=None)[source]¶

Return the node boundary.

The node boundary is all nodes in the edge boundary of a given set of nodes that are in the set.

Parameters:	G (graph) – A networkx graph nbunch1 (list, container) – Interior node set nbunch2 (list, container) – Exterior node set. If None then it is set to all of the nodes in G not in nbunch1.
Returns:	nlist – List of nodes.
Return type:	list

Notes

Nodes in nbunch1 and nbunch2 that are not in G are ignored.

nbunch1 and nbunch2 are usually meant to be disjoint, but in the interest of speed and generality, that is not required here.