Nothing
Code
attr(igraph::E(create_graph_from_dm(nyc_comp())), "vnames")
Output
[1] "airlines|flights" "airports|flights" "flights|planes" "flights|weather"
Code
create_graph_from_dm(empty_dm())
Output
IGRAPH UN-- 0 0 --
+ attr: name (v/c)
+ edges (vertex names):
Code
create_graph_from_dm(dm(x = tibble(a = 1)))
Output
IGRAPH UN-- 1 0 --
+ attr: name (v/c)
+ edges (vertex names):
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