Re: [igraph] Re: network neighborhood

[Gábor Csárdi]

On Mon, Oct 4, 2010 at 8:35 AM, anupam sinha <address@hidden> wrote:
> Hi Gabor,
>                     Thanks a lot for your reply. The program is working fine
> but I am unable to understand the output.Suppose one has following edgelist
> file of an undirected network:
>
> A - B
> A - C
> A - D
> C - E
> C - F
>
> Now if I run graph.neighborhood on this file shouldn't I get two subgraphs
>
> A-B       and   A-C
> A-C                C-E
> A-D                C-F

You get as many graphs, as many vertices in the graph (if you don't
use 'nodes' argument at least):

> g <- graph.formula(A-B:C:D, C-E:F)
> graph.neighborhood(g, order=1)
[[1]]
Vertices: 4
Edges: 3
Directed: FALSE
Edges:

[1] 'A' -- 'B'
[2] 'A' -- 'C'
[3] 'A' -- 'D'

[[2]]
Vertices: 2
Edges: 1
Directed: FALSE
Edges:
    e
e [1] 'A' -- 'B'

[[3]]
Vertices: 4
Edges: 3
Directed: FALSE
Edges:

[1] 'A' -- 'C'
[2] 'C' -- 'E'
[3] 'C' -- 'F'

[[4]]
Vertices: 2
Edges: 1
Directed: FALSE
Edges:
    e
e [1] 'A' -- 'D'

[[5]]
Vertices: 2
Edges: 1
Directed: FALSE
Edges:
    e
e [1] 'C' -- 'E'

[[6]]
Vertices: 2
Edges: 1
Directed: FALSE
Edges:
    e
e [1] 'C' -- 'F'

> One more thing is that I am unable to send any attachments to the
> igraph-help mail group . The mail simply bounces back. Thanks in advance for
> any suggestions.

The reason for this should be in the email you get back. Maybe the
attachment is too big. Attachments are allowed, AFAIK.

Best,
Gabor

> Regards,
>
> Anupam
>
[...]

-- 
Gabor Csardi <address@hidden>     UNIL DGM