[igraph] How to get all component in distance 2 from the specific compoent

[Chang Jin Shin]

Hi!

I have an undirected graph as follow.

1 - 2
1 - 5
1 - 7
2 - 3
3 - 4
5 - 6

>From this graph, I want to collect all vertices and edges in distance 2
from 'vertex 1'

SO, I want obtain

1) List of vertices in distance 1 from vertex 1
Here it's going to be: 2,5,7

2) List of vertices in distance 2 from vertex 1
Here it looks like: 3, 6

3) List of edges in distance 1 and 2 from vertext 1
1 - 2
1 - 5
1 - 7
2 - 3
5 - 6


For this, I was thinking 'subgraph' works. HOWEVER, my shortage of
knowledge in Igraph, it does not work properily to me.
Would you advise to me?

Cheers,