Return root, end, or branchpoints of an igraph object
graph.nodes(
x,
type = c("root", "end", "branch"),
original.ids = "label",
exclude.isolated = TRUE
)An igraph object
one of root, end (which includes root) or branch
Use named attribute to return original vertex ids (when available). Set to FALSE when this is not desired.
Do not count isolated vertices as root points (default)
Note that the graph must be directed in order to return a root point