CODEWITHSUNDEEP
rigraph
user2380782
user2380782

Reputation: 1446

graph.intersection does not work in igraph

Here is an example:

df1 <- graph.data.frame(V1=c(1,1,2,2,3,4), V2=c(2,3,3,5,5,5))
g1 <- graph.data.frame(df1, directed=F)
df2 <- data.frame(V1=c(1,2,2,3,4), V2=c(3,3,5,5,5))
g2 <- graph.data.frame(df2, directed=F)
df3 <- data.frame(V1=c(1,2,3,4), V2=c(3,3,5,5))
g3 <- graph.data.frame(df3, directed=F)
df4 <- data.frame(V1=c(1,1,2,3), V2=c(2,3,4,5))
g4 <- graph.data.frame(df4, directed=F)

Now create a list

mylist <- list(g1, g2, g3, g4)

And now look for the intersection

  res <- intersection(mylist, keep.all.vertices=FALSE)

But I got this weird result:

  Error in useMethod(intersection): no applicable method for 'intersection' applied to an object of class list

Any help with be appreciated, I am using igraph version 1.0.1

Upvotes: 1

Views: 223

Answers (1)

G5W
G5W

Reputation: 37661

this seems like a bit of a hack, but you can get the functionality that you are looking for with:

do.call(intersection, c(mylist, keep.all.vertices=FALSE))

Upvotes: 1

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