Character scalar, it gives what kind of adjacent edges/vertices
to include in the lists. ‘out’ is for outgoing edges/vertices,
‘in’ is for incoming edges/vertices, ‘all’ is
for both. This argument is ignored for undirected graphs.

Value

A list of numeric vectors.

Details

as_adj_list returns a list of numeric vectors, which include the ids
of neighbor vertices (according to the mode argument) of all
vertices.

as_adj_edge_list returns a list of numeric vectors, which include the
ids of adjacent edgs (according to the mode argument) of all
vertices.