R igraph manual pages

Head of the edge(s) in a graph

Description

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_edges(), incident(), is_directed(), neighbors(), tail_of()

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