Neighboring (adjacent) vertices in a graph

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"))

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.

Value

A vertex sequence containing the neighbors of the input vertex.

See also

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

Examples

g <- make_graph("Zachary")
n1 <- neighbors(g, 1)
n34 <- neighbors(g, 34)
intersection(n1, n34)
#> + 4/34 vertices, from be89d23:
#> [1]  9 14 20 32