edge_present {DiagrammeR} | R Documentation |
From a graph object of class
dgr_graph
, determine whether a directed edge
(defined by a pair of node IDs extant in the graph)
is present.
edge_present(graph, from, to)
graph |
a graph object of class
|
from |
a node ID from which the edge to be queried is outgoing. |
to |
a node ID to which the edge to be queried is incoming. |
a logical value.
# Set a seed set.seed(23) # Create a node data frame (ndf) ndf <- create_node_df( n = 26, label = TRUE, type = c(rep("a", 7), rep("b", 9), rep("c", 8), rep("d", 2))) # Create an edge data frame (edf) edf <- create_edge_df( from = sample(1:26, replace = TRUE), to = sample(1:26, replace = TRUE), rel = c(rep("rel_a", 7), rep("rel_b", 9), rep("rel_c", 8), rep("rel_d", 2))) # Create a graph using the ndf and edf graph <- create_graph( nodes_df = ndf, edges_df = edf) # Is there any edge between nodes with IDs # `1` and `2`? edge_present(graph, from = 1, to = 2) #> FALSE # Verify that there is an edge between nodes # `9` and `5` edge_present(graph, from = 9, to = 5) #> TRUE