is_edge_loop {DiagrammeR} | R Documentation |
Determines whether an edge definition is a loop edge.
is_edge_loop(graph, edge)
graph |
a graph object of class
|
edge |
a numeric edge ID value. |
a logical value.
# Create a graph that has multiple # loop edges graph <- create_graph() %>% add_path(n = 4) %>% add_edge( from = 1, to = 1) %>% add_edge( from = 3, to = 3) # Get the graph's internal # edge data frame graph %>% get_edge_df() #> id from to rel #> 1 1 1 2 <NA> #> 2 2 2 3 <NA> #> 3 3 3 4 <NA> #> 4 4 1 1 <NA> #> 5 5 3 3 <NA> # Determine if edge `4` is # a loop edge graph %>% is_edge_loop(edge = 4) #> [1] TRUE # Determine if edge `2` is # a loop edge graph %>% is_edge_loop(edge = 2) #> [1] FALSE