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.
# 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) # Get counts of nodes grouped by the # `type` attribute node_count(graph, type = TRUE) #> a b c d #> 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 a specified type node_count(graph, type = "a") #> [1] 7 # Get a count of nodes of 2 different types node_count(graph, type = c("a", "c")) #> [1] 15