DiagrammeR: add_gnm_graph – R documentation

Become an expert in R — Interactive courses, Cheat Sheets, certificates and more!

add_gnm_graph

Add a G(n, m) Erdos-Renyi graph

Description

To an existing graph object, add a graph built according to the Erdos-Renyi G(n, m) model. This uses the same constant probability when creating the fixed number of edges. Thus for n nodes there will be m edges and, if the loops argument is set as TRUE, then random loop edges will be part of m.

Usage

add_gnm_graph(
  graph,
  n,
  m,
  loops = FALSE,
  type = NULL,
  label = TRUE,
  rel = NULL,
  node_aes = NULL,
  edge_aes = NULL,
  node_data = NULL,
  edge_data = NULL,
  set_seed = NULL
)

Arguments

`graph`	A graph object of class `dgr_graph`.
`n`	The number of nodes comprising the generated graph.
`m`	The number of edges in the generated graph.
`loops`	A logical value (default is `FALSE`) that governs whether loops are allowed to be created.
`type`	An optional string that describes the entity type for all the nodes to be added.
`label`	A boolean 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 edges to be added.
`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.
`set_seed`	Supplying a value sets a random seed of the `Mersenne-Twister` implementation.

Value

A graph object of class dgr_graph.

Examples

# Create an undirected GNM
# graph with 100 nodes and
# 120 edges
gnm_graph <-
  create_graph(
    directed = FALSE) %>%
  add_gnm_graph(
    n = 100,
    m = 120)

# Get a count of nodes
gnm_graph %>% count_nodes()

# Get a count of edges
gnm_graph %>% count_edges()

DiagrammeR

Graph/Network Visualization

v1.0.6.1

MIT + file LICENSE

Authors

Richard Iannone [aut, cre] (<https://orcid.org/0000-0003-3925-190X>)

Initial release