DiagrammeR (version 0.7)

get_nodes: Get vector of node IDs

Description

Provides information on the node IDs from one or several node data frames, edge data frames, or graph objects.

Usage

get_nodes(...)

Arguments

...

a collection of node data frames, edge data frames, or a single graph object.

Value

• a vector of node ID values.

Examples

# Before getting node ID values, 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),
               label = "edge",
               relationship = "letter_to_letter")

graph <-
  create_graph(nodes_df = nodes,
               edges_df = edges,
               graph_attrs = "layout = neato",
               node_attrs = c("fontname = Helvetica",
                              "shape = circle"))

# Get a vector of all nodes in a graph
get_nodes(graph)
#> [1] "A" "B" "C" "D" "E" "F" "G" "H" "I" "J" "K" "L"
#> [13] "M" "N" "O" "P" "Q" "R" "S" "T" "U" "V" "W" "X"
#> [25] "Y" "Z"

# Get a vector of node ID values from a node data frame
get_nodes(nodes)
#> [1] "A" "B" "C" "D" "E" "F" "G" "H" "I" "J" "K" "L"
#> [13] "M" "N" "O" "P" "Q" "R" "S" "T" "U" "V" "W" "X"
#> [25] "Y" "Z"

# Get a vector of node ID values from an edge data frame
get_nodes(edges)
#> [1] "A" "B" "C" "D" "E" "F" "G" "H" "I" "J" "K" "L"
#> [13] "M" "N" "O" "P" "Q" "R" "S" "T" "U" "V" "W" "X"
#> [25] "Y" "Z"