These functions lets the user query whether the edges in a graph is of a specific type. All functions return a logical vector giving whether each edge in the graph corresponds to the specific type.

edge_is_multiple()

edge_is_loop()

edge_is_mutual()

edge_is_from(from)

edge_is_to(to)

edge_is_between(from, to, ignore_dir = !graph_is_directed())

edge_is_incident(i)

Arguments

from, to, i

A vector giving node indices

ignore_dir

Is both directions of the edge allowed

Value

A logical vector of the same length as the number of edges in the graph

Functions

  • edge_is_multiple(): Query whether each edge has any parallel siblings

  • edge_is_loop(): Query whether each edge is a loop

  • edge_is_mutual(): Query whether each edge has a sibling going in the reverse direction

  • edge_is_from(): Query whether an edge goes from a set of nodes

  • edge_is_to(): Query whether an edge goes to a set of nodes

  • edge_is_between(): Query whether an edge goes between two sets of nodes

  • edge_is_incident(): Query whether an edge goes from or to a set of nodes

Examples

create_star(10, directed = TRUE, mutual = TRUE) %>%
  activate(edges) %>%
  sample_frac(0.7) %>%
  mutate(single_edge = !edge_is_mutual())
#> `.env` is deprecated and no longer has any effect
#> # A tbl_graph: 10 nodes and 13 edges
#> #
#> # A directed simple graph with 2 components
#> #
#> # Edge Data: 13 × 3 (active)
#>    from    to single_edge
#>   <int> <int> <lgl>      
#> 1     1     3 TRUE       
#> 2     1     4 FALSE      
#> 3     4     1 FALSE      
#> 4     1     5 TRUE       
#> 5     1     6 FALSE      
#> 6     6     1 FALSE      
#> # … with 7 more rows
#> #
#> # Node Data: 10 × 0
#> # … with 7 more rows