Select edges in a graph object of class dgr_graph using node ID values. All edges associated with the provided nodes will be included in the selection.

select_edges_by_node_id(graph, nodes, set_op = "union")

Arguments

graph

a graph object of class dgr_graph.

nodes

a vector of node 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 union (the default), as an intersection of selections with intersect, or, as a difference on the previous selection, if it exists.

Value

a graph object of class dgr_graph.

Examples

# Create a graph with 5 nodes graph <- create_graph() %>% add_path(n = 5) # Create a graph selection by selecting edges # associated with nodes `1` and `2` graph <- graph %>% select_edges_by_node_id( nodes = 1:2) # Get the selection of edges graph %>% get_selection()
#> [1] 1 2
# Perform another selection of edges, with nodes # `1`, `2`, and `4` graph <- graph %>% clear_selection() %>% select_edges_by_node_id( nodes = c(1, 2, 4)) # Get the selection of edges graph %>% get_selection()
#> [1] 1 2 3 4
# Get a fraction of the edges selected over all # the edges in the graph graph %>% { l <- get_selection(.) %>% length(.) e <- count_edges(.) l/e }
#> [1] 1