cartesian_product

cartesian_product(G, H)

Returns the Cartesian product of G and H.

The Cartesian product \(P\) of the graphs \(G\) and \(H\) has a node set that is the Cartesian product of the node sets, \(V(P)=V(G) \times V(H)\). \(P\) has an edge \(((u,v),(x,y))\) if and only if either \(u\) is equal to \(x\) and both \(v\) and \(y\) are adjacent in \(H\) or if \(v\) is equal to \(y\) and both \(u\) and \(x\) are adjacent in \(G\).

Parameters:

G, H: graphs

Networkx graphs.

Returns:

P: NetworkX graph

The Cartesian product of G and H. P will be a multi-graph if either G or H is a multi-graph. Will be a directed if G and H are directed, and undirected if G and H are undirected.

Raises:

NetworkXError

If G and H are not both directed or both undirected.

Notes

Node attributes in P are two-tuple of the G and H node attributes. Missing attributes are assigned None.

Examples

>>> G = nx.Graph()
>>> H = nx.Graph()
>>> G.add_node(0, a1=True)
>>> H.add_node("a", a2="Spam")
>>> P = nx.cartesian_product(G, H)
>>> list(P)
[(0, 'a')]

Edge attributes and edge keys (for multigraphs) are also copied to the new product graph