[igraph] Retrieve nodes forming a motif with subgraph_isomorphisms

[Phil Cui]

Dear igraph community,

I'm trying to apply subgraph_isomorphisms to detect the motifs 
in a small neighborhood which are the same type as the specified motif, 
specifically,
I use subgraph_isomorphisms(g2, g1) to find the motifs in g1 
which are exactly the same type as g2. 

However, the result is not exactly what I want since:

(1) it gives motifs including those are the same type as g1 and also those are 
different types from g1 according to the result from 
isomorphism_class;

(2) there are many duplicated combinations of nodes which relates to
the same motif;

(3) the result provided is based on the vertex name, but I prefer vertex id.
I tried unlist to get the ids, however, that will combine all everything together.

So, I am wondering if there is a comparable function which satisfies the above 

requirements.

Thank you all,

Phil