Check whether a graph is directed

Check whether a graph is directed

is_directed(graph)

Arguments

graph

The input graph

Value

Logical scalar, whether the graph is directed.

See also

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

Examples

g <- make_ring(10)
is_directed(g)
#> [1] FALSE

g2 <- make_ring(10, directed = TRUE)
is_directed(g2)
#> [1] TRUE