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
Value
A list of numeric vectors.
concept
Adjacency list
Details
get.adjlist returns a list of numeric vectors, which include
the ids of neighbor vertices (according to the mode argument) of all
vertices.
get.adjedgelist returns a list of numeric vectors, which
include the ids of adjacent edgs (according to the mode
argument) of all vertices.