[igraph] retrieve the list of nodes forming a certain motif

[sergiu netotea]

Hello dear igraph community,

I need to retrieve all the nodes that are part of a certain network
motif, identified by a certain isoclass (3 or 4 nodes, directed).
The simple way to do this (doing 3-4 loops that run through the full
node combinations and check if the subgraph is isomorphic to my
isomorphism class) is probably not the smartest idea when the network
is ~1 mil edges.

Is there a more elegant option? I would prefer it in R but C works too.

Thank you,
Sergiu