Convert a vertex or edge sequence to an ordinary vectorSource:
Convert a vertex or edge sequence to an ordinary vector
For graphs without names, a numeric vector is returned, containing the internal numeric vertex or edge ids.
For graphs with names, and vertex sequences, the vertex names are returned in a character vector.
For graphs with names and edge sequences, a character vector is
returned, with the ‘bar’ notation:
a|b means an edge from
a to vertex