[igraph] how to subgraph layout coordinates

[Simone Gabbriellini]

List,

I am trying to subset coordinates from a layout, because I want to
plot over an existing plot, and I need the coordinates of nodes to be
fixed

I tryied something like:

# list of my subset nodes
core = c(1,2,3,4,5)

l2 <- l[ which( V(g) == core ) ]

but I got the error

Warning message:
In V(g) + 1 == core :
  longer object length is not a multiple of shorter object length

can someone point me in the right direction?

thanks,
simone