leaves: Find the leaves of a graph

In graph: graph: A package to handle graph data structures

Description

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.

Usage

leaves(object, degree.dir)

Arguments

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.

Value

A character vector giving the node labels of the leaves.

Author(s)

Seth Falcon

Examples

data(graphExamples)
graphExamples[[1]]
leaves(graphExamples[[1]])

data(apopGraph)
leaves(apopGraph, "in")
leaves(apopGraph, "out")

graph documentation built on Nov. 8, 2020, 6:02 p.m.