Add a 2D grid of nodes to the graph — add_grid

With a graph object of class dgr_graph, add a two-dimensional grid to the graph.

Usage

add_grid_2d(
  graph,
  x,
  y,
  type = NULL,
  label = TRUE,
  rel = NULL,
  node_aes = NULL,
  edge_aes = NULL,
  node_data = NULL,
  edge_data = NULL
)

Arguments

graph: A graph object of class dgr_graph.
x: The number of nodes in the x direction.
y: The number of nodes in the y direction.
type: An optional string that describes the entity type for the nodes to be added.
label: Either a vector object of length x * y that provides optional labels for the new nodes, or, a logical value where setting to TRUE ascribes node IDs to the label and FALSE yields a blank label.
rel: An optional string for providing a relationship label to all new edges created in the grid.
node_aes: An optional list of named vectors comprising node aesthetic attributes. The helper function node_aes() is strongly recommended for use here as it contains arguments for each of the accepted node aesthetic attributes (e.g., shape, style, color, fillcolor).
edge_aes: An optional list of named vectors comprising edge aesthetic attributes. The helper function edge_aes() is strongly recommended for use here as it contains arguments for each of the accepted edge aesthetic attributes (e.g., shape, style, penwidth, color).
node_data: An optional list of named vectors comprising node data attributes. The helper function node_data() is strongly recommended for use here as it helps bind data specifically to the created nodes.
edge_data: An optional list of named vectors comprising edge data attributes. The helper function edge_data() is strongly recommended for use here as it helps bind data specifically to the created edges.

Value

A graph object of class dgr_graph.

Examples

# Create a new graph and add
# a 3 x 3 grid
graph <-
  create_graph() %>%
  add_grid_2d(
    x = 3, y = 3,
    type = "grid")

# Get node information
# from this graph
graph %>%
  get_node_info()
#>   id type label deg indeg outdeg loops
#> 1  1 grid     1   2     0      2     0
#> 2  2 grid     2   3     1      2     0
#> 3  3 grid     3   2     1      1     0
#> 4  4 grid     4   3     1      2     0
#> 5  5 grid     5   4     2      2     0
#> 6  6 grid     6   3     2      1     0
#> 7  7 grid     7   2     1      1     0
#> 8  8 grid     8   3     2      1     0
#> 9  9 grid     9   2     2      0     0

# Attributes can be specified
# in extra arguments and these
# are applied in order; Usually
# these attributes are applied
# to nodes (e.g., `type` is a
# node attribute) but the `rel`
# attribute will apply to the
# edges
graph_w_attrs <-
  create_graph() %>%
  add_grid_2d(
    x = 3, y = 2,
    label = c("one", "two",
              "three", "four",
              "five", "six"),
    type = c("a", "a",
             "b", "b",
             "c", "c"),
    rel = "grid",
    node_data = node_data(
      value = c(
        1.2, 8.4, 3.4,
        5.2, 6.1, 2.6)))

# Get the graph's node data frame
graph_w_attrs %>% get_node_df()
#>   id type label value
#> 1  1    a   one   1.2
#> 2  2    a   two   8.4
#> 3  3    b three   3.4
#> 4  4    b  four   5.2
#> 5  5    c  five   6.1
#> 6  6    c   six   2.6

# Get the graph's edge data frame
graph_w_attrs %>% get_edge_df()
#>   id from to  rel
#> 1  1    1  2 grid
#> 2  2    1  4 grid
#> 3  3    2  3 grid
#> 4  4    2  5 grid
#> 5  5    3  6 grid
#> 6  6    4  5 grid
#> 7  7    5  6 grid