intersection

intersection(G, H)

Returns a new graph that contains only the nodes and the edges that exist in both G and H.

Parameters:

G,Hgraph

A NetworkX graph. G and H can have different node sets but must be both graphs or both multigraphs.

Returns:

GHA new graph with the same type as G.

Raises:

NetworkXError

If one is a MultiGraph and the other one is a graph.

Notes

Attributes from the graph, nodes, and edges are not copied to the new graph. If you want a new graph of the intersection of G and H with the attributes (including edge data) from G use remove_nodes_from() as follows

>>> G = nx.path_graph(3)
>>> H = nx.path_graph(5)
>>> R = G.copy()
>>> R.remove_nodes_from(n for n in G if n not in H)
>>> R.remove_edges_from(e for e in G.edges if e not in H.edges)

Examples

>>> G = nx.Graph([(0, 1), (0, 2), (1, 2)])
>>> H = nx.Graph([(0, 3), (1, 2), (2, 3)])
>>> R = nx.intersection(G, H)
>>> R.nodes
NodeView((0, 1, 2))
>>> R.edges
EdgeView([(1, 2)])
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Additional backends implement this function

graphblas : OpenMP-enabled sparse linear algebra backend.