leaves {graph} | R Documentation |
A leaf of an undirected graph is a node with degree equal to one. A leaf of a directed graph is defined with respect to in-degree or out-degree. The leaves of a directed graph with respect to in-degree (out-degree) are those nodes with in-degree (out-degree) equal to zero.
leaves(object, degree.dir)
object |
A graph object |
degree.dir |
One of "in" or "out" . This argument
is ignored when object is undirected and required otherwise.
When degree.dir="in" (degree.dir="out" ), nodes have no
in coming (out going) edges will be returned. |
A character vector giving the node labels of the leaves.
Seth Falcon
data(graphExamples) graphExamples[[1]] leaves(graphExamples[[1]]) data(apopGraph) leaves(apopGraph, "in") leaves(apopGraph, "out")