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.
are_adjacent(graph, v1, v2)
- The graph.
- The first vertex, tail in directed graphs.
- The second vertex, head in directed graphs.
- A logical scalar,
(v1, v2)exists in the graph.
Other structural queries:
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)