are_adjacent

0th

Percentile

Are two vertices adjacent?

The order of the vertices only matters in directed graphs, where the existence of a directed (v1, v2) edge is queried.

Usage
are_adjacent(graph, v1, v2)
Arguments
graph

The graph.

v1

The first vertex, tail in directed graphs.

v2

The second vertex, head in directed graphs.

Value

A logical scalar, TRUE is a (v1, v2) exists in the graph.

See Also

Other structural queries: [.igraph; [[.igraph; adjacent_vertices; ecount, gsize; ends, get.edge, get.edges; get.edge.ids; gorder, vcount; head_of; incident_edges; incident; is.directed, is_directed; neighbors; tail_of

Aliases
  • are.connected
  • are_adjacent
Examples
# NOT RUN {
ug <- make_ring(10)
ug
are_adjacent(ug, 1, 2)
are_adjacent(ug, 2, 1)

dg <- make_ring(10, directed = TRUE)
dg
are_adjacent(ug, 1, 2)
are_adjacent(ug, 2, 1)
# }
Documentation reproduced from package igraph, version 1.0.1, License: GPL (>= 2)

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