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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