Head of the edge(s) in a graph

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

Usage

head_of(graph, es)

Arguments

graph

The input graph.

es

The edges to query.

Value

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

See also

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