display_metagraph: Display a property graph's underlying model

Description

With a graph object of class dgr_graph that is also a property graph (i.e., all nodes have an assigned type value and all edges have an assigned rel value), display its metagraph in the RStudio Viewer. This representation provides all combinations of edges of different rel values to all nodes with distinct type values, including any edges to nodes of the same type (shown as loops). The precondition of the graph being a property graph can be verified by using the is_property_graph() function.

Usage

display_metagraph(graph)

Arguments

graph

A graph object of class dgr_graph. This graph must fulfill the condition of being a property graph, otherwise the function yields an error.

Examples

Run this code

# NOT RUN {
# Create a randomized property
# graph with 1000 nodes and 1350 edges
property_graph <-
  create_graph() %>%
  add_gnm_graph(
    n = 1000,
    m = 1350,
    set_seed = 23) %>%
  select_nodes_by_degree(
    expressions = "deg >= 3") %>%
  set_node_attrs_ws(
    node_attr = type,
    value = "a") %>%
  clear_selection() %>%
  select_nodes_by_degree(
    expressions = "deg < 3") %>%
  set_node_attrs_ws(
    node_attr = type,
    value = "b") %>%
  clear_selection() %>%
  select_nodes_by_degree(
    expressions = "deg == 0") %>%
  set_node_attrs_ws(
    node_attr = type,
    value = "c") %>%
  set_node_attr_to_display(
    attr = type) %>%
  select_edges_by_node_id(
    nodes =
      get_node_ids(.) %>%
      sample(
        size = 0.15 * length(.) %>%
          floor())) %>%
  set_edge_attrs_ws(
    edge_attr = rel,
    value = "r_1") %>%
  invert_selection() %>%
  set_edge_attrs_ws(
    edge_attr = rel,
    value = "r_2") %>%
  clear_selection() %>%
  copy_edge_attrs(
    edge_attr_from = rel,
    edge_attr_to = label) %>%
  add_global_graph_attrs(
    attr = "fontname",
    value = "Helvetica",
    attr_type = "edge") %>%
  add_global_graph_attrs(
    attr = "fontcolor",
    value = "gray50",
    attr_type = "edge") %>%
  add_global_graph_attrs(
    attr = "fontsize",
    value = 10,
    attr_type = "edge")

# Display this graph's
# metagraph, or, the underlying
# graph model for a property graph
# display_metagraph(property_graph)

# }

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