This function tests whether the given graph is free of cycles.
Details
This function looks for directed cycles in directed graphs and undirected
cycles in undirected graphs. Use find_cycle() to return a specific cycle.
See also
is_forest() and is_dag() for functions specific to undirected
and directed graphs.
Graph cycles
feedback_arc_set(),
feedback_vertex_set(),
find_cycle(),
girth(),
has_eulerian_path(),
is_dag(),
simple_cycles()
Other structural.properties:
bfs(),
component_distribution(),
connect(),
constraint(),
coreness(),
degree(),
dfs(),
distance_table(),
edge_density(),
feedback_arc_set(),
feedback_vertex_set(),
girth(),
is_dag(),
is_matching(),
k_shortest_paths(),
knn(),
reciprocity(),
subcomponent(),
subgraph(),
topo_sort(),
transitivity(),
unfold_tree(),
which_multiple(),
which_mutual()
Examples
g <- make_graph(c(1, 2, 1, 3, 2, 4, 3, 4), directed = TRUE)
is_acyclic(g)
#> [1] TRUE
is_acyclic(as_undirected(g))
#> [1] FALSE