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.
## Not run: # Before getting counts of nodes, create a simple graph 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))) edges <- create_edges(from = sample(LETTERS, replace = TRUE), to = sample(LETTERS, replace = TRUE), rel = "letter_to_letter") graph <- create_graph(nodes_df = nodes, edges_df = edges, graph_attrs = "layout = neato", node_attrs = c("fontname = Helvetica", "shape = circle")) # 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 ## End(Not run)