node_present {DiagrammeR} | R Documentation |
From a graph object of class
dgr_graph
, determine whether a specified node
is present.
node_present(graph, node)
graph |
a graph object of class
|
node |
a value that may or may not match a node ID in the graph. |
a logical value.
# Set a seed set.seed(24) # 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) # Verify that node with ID `34` is not in graph node_present(graph, 34) #> FALSE # Is node with ID 5 in the graph? node_present(graph, 5) #> TRUE # Are all node ID values from `1` to `26` # in the graph? all(sapply(1:26, function(x) node_present(graph, x))) #> TRUE