Incident edges of a vertex in a graph

Incident edges of a vertex in a graph

Usage

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

Arguments

graph

The input graph.

v

The vertex of which the incident edges are queried.

mode

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

Value

An edge sequence containing the incident edges of the input vertex.

Related documentation in the C library

incident(), is_directed(), ecount(), edges(), vcount(), get_eids()

See also

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

Examples

g <- make_graph("Zachary")
incident(g, 1)
#> ── <edge sequence> 16/78 · from df5daa1 ────────────────────────────────────────
#>  [1] 1 ─ 2   1 ─ 3   1 ─ 4   1 ─ 5   1 ─ 6   1 ─ 7   1 ─ 8   1 ─ 9   1 ─ 11 
#> [10] 1 ─ 12  1 ─ 13  1 ─ 14  1 ─ 18  1 ─ 20  1 ─ 22  1 ─ 32 
incident(g, 34)
#> ── <edge sequence> 17/78 · from df5daa1 ────────────────────────────────────────
#>  [1] 9 ─ 34   10 ─ 34  14 ─ 34  15 ─ 34  16 ─ 34  19 ─ 34  20 ─ 34  21 ─ 34 
#>  [9] 23 ─ 34  24 ─ 34  27 ─ 34  28 ─ 34  29 ─ 34  30 ─ 34  31 ─ 34  32 ─ 34 
#> [17] 33 ─ 34