Re: [igraph] delete connected vertices of to-be-deleted vertices

[Tamas Nepusz]

Hi Cesar,

> But, does this step ALSO remove THEIR CONNECTED VERTICES?
No - quite unsurprisingly, delete.vertices() will delete only those
vertices that you specify explicitly.

> If not, how can I achieve this?
Use the ego() function to extract the list of vertices that are at
most a given number of steps to a given seed vertex, followed by
unlist() and unique():

vs <- c(1,2,3,4)
unique(unlist(ego(g, 1, vs)))

This gives you a numeric vector that contains the seed vertices (in
vs) and all the vertices that are neighbors of at least one seed
vertex.

T.