node_boundary(G, nbunch1, nbunch2=None)¶
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.
- 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.
nlist – List of nodes.
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.