head_of
From igraph v1.2.3
by Gabor Csardi
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_edges,
incident, is_directed,
neighbors, tail_of
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