Edge Subsets

Subset an edge list

retain.groups(edges, groups)

retain.nodes(edges, nodes)

Arguments

edges	an edge list
groups	the groups to retain in the subset
nodes	the nodes to retain in the subset

Value

retain.groups returns an edge list containing only edges from the specified groups. retain.nodes returns an edge list containing only edges incident on the specified nodes.

Details

These functions extract a subset of an edge list containing only edges in a specified group, or incident with a specified set of nodes.

Examples

edges <- parse.digraph(c("A *-> B","B *-> C","C *--> D"))
write.digraph(retain.groups(edges,c(0)))
#> A *-> B
#> B *-> C