node_count {DiagrammeR} | R Documentation |
From a graph object of class
dgr_graph
, get a count of nodes in the graph
and optionally obtain a count of nodes by their type.
node_count(graph, type = FALSE)
graph |
a graph object of class
|
type |
either a logical value, where
|
a numeric vector of single length.
# Create a node data frame nodes <- create_nodes( nodes = LETTERS, label = TRUE, type = c(rep("a_to_g", 7), rep("h_to_p", 9), rep("q_to_x", 8), rep("y_and_z",2))) # Create an edge data frame edges <- create_edges( from = sample(LETTERS, replace = TRUE), to = sample(LETTERS, replace = TRUE), rel = "letter_to_letter") # Create a graph graph <- create_graph(nodes_df = nodes, edges_df = edges) # Get counts of nodes grouped by the # `type` attribute node_count(graph, type = TRUE) # the default #> a_to_g h_to_p q_to_x y_and_z #> 7 9 8 2 # Get a total count of nodes with no grouping node_count(graph, type = FALSE) #> [1] 26 # Get a count of nodes of one or more # specified types node_count(graph, type = "a_to_g") #> [1] 7 node_count(graph, type = c("a_to_g", "q_to_x")) #> [1] 15