igraph (version 1.3.5)

neighbors: Neighboring (adjacent) vertices in a graph

Description

A vertex is a neighbor of another one (in other words, the two vertices are adjacent), if they are incident to the same edge.

Usage

neighbors(graph, v, mode = c("out", "in", "all", "total"))

Value

A vertex sequence containing the neighbors of the input vertex.

Arguments

graph

The input graph.

v

The vertex of which the adjacent vertices are queried.

mode

Whether to query outgoing (‘out’), incoming (‘in’) edges, or both types (‘all’). This is ignored for undirected graphs.

See Also

Other structural queries: [.igraph(), [[.igraph(), adjacent_vertices(), are_adjacent(), ends(), get.edge.ids(), gorder(), gsize(), head_of(), incident_edges(), incident(), is_directed(), tail_of()

Examples

g <- make_graph("Zachary")
n1 <- neighbors(g, 1)
n34 <- neighbors(g, 34)
intersection(n1, n34)