igraph (version 1.0.0)

head_of: 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.connected, are_adjacent; ecount, gsize; ends, get.edge, get.edges; get.edge.ids; gorder, vcount; incident_edges; incident; is.directed, is_directed; neighbors; tail_of