Description

For undirected graphs, head and tail is not defined. In this case tail_of returns vertices incident to the supplied edges, and head_of returns the other end(s) of the edge(s).

Usage

Arguments

Value

A vertex sequence with the tail(s) of the edge(s).

See Also

Other structural queries: [.igraph(), [[.igraph(), adjacent_vertices(), are_adjacent(), ends(), get.edge.ids(), gorder(), gsize(), head_of(), incident_edges(), incident(), is_directed(), neighbors()