Re: [igraph] graph intersection with graph objects stored in a list

[Raunak Shrestha]

No worries, I solved it. The following worked well

do.call(intersection, c(listg, byname="auto", keep.all.vertices=FALSE))

Regards
Raunak Shrestha

On Fri, Nov 25, 2016 at 2:39 PM, Raunak Shrestha <address@hidden> wrote:

Hi Gabor,

Thanks do.call works. However, how do I change parameters below within the intersection function ?

byname="auto", keep.all.vertices=FALSE

Regards
Raunak Shrestha

On Fri, Nov 25, 2016 at 12:59 AM, Gábor Csárdi <address@hidden> wrote:

do.call(intersection, listg)

See ?do.call

Gabor

On Fri, Nov 25, 2016 at 4:35 AM, Raunak Shrestha <address@hidden> wrote:
> Hello,
>
> I'm trying to intersection of multiple graphs where the graph objects are
> stored in a list.
>
> For example,
>
> library(igraph)
> g1 <- graph.formula(A -- B -- C -- D)
> g2 <- graph.formula(C -- E -- D -- C)
> g3 <- graph.formula(B -- C -- D -- A)
>
> listg <- list(g1, g2, g3)
>
> If I mention individual graph objects separately, I obtain the desired
> result
>
> intersection(listg[[1]], listg[[2]], listg[[3]], keep.all.vertices = FALSE)
> IGRAPH UN-- 2 1 --
> + attr: name (v/c)
> + edge (vertex names):
> [1] C--D
>
> But I get the following error message when I use the list
>
> intersection(listg, keep.all.vertices = FALSE)
> Error in UseMethod("intersection") :
>   no applicable method for 'intersection' applied to an object of class
> "list"
>
> Since, I need to perform intersection of a large number of graphs >20 with
> different combination, it is not feasible to type in individual graph
> objects separately.
> Using a list would simplify my task to a greater extent.
>
> Could you please let me know how to overcome this problem,?
>
> Regards
> Raunak
>
>
>

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