select_edges_by_edge_id {DiagrammeR} | R Documentation |
Select edges in a graph object of class
dgr_graph
using edge ID values.
select_edges_by_edge_id(graph, edges, set_op = "union")
graph |
a graph object of class
|
edges |
a vector of edge IDs for the selection of edges present in the graph. |
set_op |
the set operation to perform upon
consecutive selections of graph edges This can
either be as a |
a graph object of class dgr_graph
.
# Create a graph with 5 nodes graph <- create_graph() %>% add_path(n = 5) # Create a graph selection by selecting # edges with edge IDs `1` and `2` graph <- graph %>% select_edges_by_edge_id( edges = 1:2) # Get the selection of edges graph %>% get_selection() #> [1] 1 2 # Perform another selection of edges, # with edge IDs `1`, `2`, and `4` graph <- graph %>% clear_selection() %>% select_edges_by_edge_id( edges = c(1, 2, 4)) # Get the selection of edges graph %>% get_selection() #> [1] 1 2 4 # Get the fraction of edges selected # over all the edges in the graph graph %>% { l <- get_selection(.) %>% length(.) e <- edge_count(.) l/e } #> [1] 0.75