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