From a graph object of class dgr_graph, determine whether a specified node is present.

is_node_present(graph, node)

Arguments

graph

a graph object of class dgr_graph.

node

either a node ID value or a node label to test for presence in the graph.

Value

a logical value.

Examples

# Create a simple graph with # a path of four nodes graph <- create_graph() %>% add_path( n = 4, type = "path", label = c( "one", "two", "three", "four")) # Determine if there is a node # with ID `1` in the graph graph %>% is_node_present(node = 1)
#> [1] TRUE
# Determine if there is a node # with ID `5` in the graph graph %>% is_node_present(node = 5)
#> [1] FALSE
# Determine if there is a node # with label `two` in the graph graph %>% is_node_present(node = "two")
#> [1] TRUE