How is this different from just calling induced.subgraph()? (Apart from
being slower for small subgraphs of large graphs.)
> g <- graph.ring(10)
> V(g)$name <- LETTERS[1:10]
> get.edgelist(get_sub_graph(6:10, g), names = FALSE)
[,1] [,2]
[1,] 1 2
[2,] 2 3
[3,] 3 4
[4,] 4 5
> get.edgelist(induced.subgraph(g, 6:10), names = FALSE)
[,1] [,2]
[1,] 1 2
[2,] 2 3
[3,] 3 4
[4,] 4 5
G.
On Sun, May 3, 2015 at 5:47 PM, Peidong Chen <[email protected]> wrote:
> I think it is better to define functions by our own.
>
> get_sub_graph <- function(subGraphNodes,g)
> {
> nonSubGraphNodes <- which(!((1:vcount(g)) %in% subGraphNodes))
> subGraph <- delete.vertices(g , nonSubGraphNodes)
> subGraph
> }
>
> 2015-05-03 14:24 GMT-07:00 Fatemeh a <[email protected]>:
>
>
>> thanks for your reply.
>> this question raised because as you mention "induced.subgraph"actually
>> dose that , but I checked it when we keep delete.vertices = FALSE and with
>> one small example it dosen't change that, but i can't be sure and
>> generalized it, so what about when we keep the vertices ?
>>
>> On Mon, May 4, 2015 at 1:39 AM, Peidong Chen <[email protected]> wrote:
>>
>>> I think it changes nodes indices, because like "induced.subgraph"
>>> function creates a totally new indices different from the original graph
>>>
>>> 2015-05-03 14:07 GMT-07:00 Fatemeh a <[email protected]>:
>>>
>>>> Hi all,
>>>>
>>>> I have a question regards subgraph, dose supgraph.edges function
>>>> changes nodes indices?
>>>>
>>>> thank you in advance,
>>>> Fatemeh
>>>>
>>>> --
>>>> regards
>>>> F..A
>>>>
>>>> _______________________________________________
>>>> igraph-help mailing list
>>>> [email protected]
>>>> https://lists.nongnu.org/mailman/listinfo/igraph-help
>>>>
>>>>
>>>
>>> _______________________________________________
>>> igraph-help mailing list
>>> [email protected]
>>> https://lists.nongnu.org/mailman/listinfo/igraph-help
>>>
>>>
>>
>>
>> --
>> regards
>> F..A
>>
>> _______________________________________________
>> igraph-help mailing list
>> [email protected]
>> https://lists.nongnu.org/mailman/listinfo/igraph-help
>>
>>
>
> _______________________________________________
> igraph-help mailing list
> [email protected]
> https://lists.nongnu.org/mailman/listinfo/igraph-help
>
>
_______________________________________________
igraph-help mailing list
[email protected]
https://lists.nongnu.org/mailman/listinfo/igraph-help
