Extract the edges that run from an actor to himself
extract_loops(x)
extract_loops_vertex(x)see above
Several functions in this package deal with loops (also sometimes redundantly called "self-loops")"ties that run from a vertex to that same vertex.
This specific function extracts the edge id's for these loops, so they can be identified and, if required, removed.
extract_loops returns the edge ID's of the loops in the graph
extract_loops_vertex returns a table with two columns, the first
contains the vertex that has at least one loop in the graph and the
second gives the number of loops for that vertex in the graph.
data(florentine, package = "snafun")
x <- florentine$flobusiness
has_loops(x) # FALSE
#> [1] FALSE
extract_loops(x) # NULL
#> NULL
extract_loops_vertex(x) # NULL
#> NULL
x <- igraph::add_edges(x, c("Barbadori", "Barbadori", "Medici", "Medici"))
has_loops(x) # FALSE
#> [1] TRUE
extract_loops(x) # loops detected
#> [1] 16 17
extract_loops_vertex(x)
#> vertex number_of_loops
#> 1 Barbadori 1
#> 2 Medici 1