Create a complement of a graph — transform_to_complement

Create a complement graph which contains only edges not present in the input graph. It's important to nodes that any edge attributes in the input graph's edges will be lost. Node attributes will be retained, since they are not affected by this transformation.

Usage

transform_to_complement_graph(graph, loops = FALSE)

Arguments

graph: A graph object of class dgr_graph.
loops: An option for whether loops should be generated in the complement graph.

Value

a graph object of class dgr_graph.

Examples

# Create a simple graph
# with a single cycle
graph <-
  create_graph() %>%
  add_cycle(n = 4)

# Get the graph's edge
# data frame
graph %>% get_edge_df()
#>   id from to  rel
#> 1  1    1  2 <NA>
#> 2  2    2  3 <NA>
#> 3  3    3  4 <NA>
#> 4  4    4  1 <NA>

# Create the complement
# of the graph
graph_c <-
  graph %>%
    transform_to_complement_graph()

# Get the edge data frame
# for the complement graph
graph_c %>% get_edge_df()
#>   id from to  rel
#> 1  1    1  4 <NA>
#> 2  2    1  3 <NA>
#> 3  3    2  4 <NA>
#> 4  4    2  1 <NA>
#> 5  5    3  2 <NA>
#> 6  6    3  1 <NA>
#> 7  7    4  3 <NA>
#> 8  8    4  2 <NA>