1.3. igraph_subisomorphic — Decide subgraph isomorphism

int igraph_subisomorphic(const igraph_t *graph1, const igraph_t *graph2,
			 igraph_bool_t *iso);

Check whether graph2 is isomorphic to a subgraph of graph1. Currently this function just calls igraph_subisomorphic_vf2() for all graphs.

Arguments:

`graph1`:	The first input graph, may be directed or undirected. This is supposed to be the bigger graph.
`graph2`:	The second input graph, it must have the same directedness as `graph2`, or an error is triggered. This is supposed to be the smaller graph.
`iso`:	Pointer to a boolean, the result is stored here.

Returns:

Error code.

Time complexity: exponential.