| retain.groups | R Documentation | 
Subset an edge list
retain.groups(edges, groups) retain.nodes(edges, nodes)
| edges | an edge list | 
| groups | the groups to retain in the subset | 
| nodes | the nodes to retain in the subset | 
These functions extract a subset of an edge list containing only edges in a specified group, or incident with a specified set of nodes.
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.
edges <- parse.digraph(c("A *-> B","B *-> C","C *--> D"))
write.digraph(retain.groups(edges,c(0)))
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