# tail_of

From igraph v1.2.4.2
by Gabor Csardi

##### Tails of the edge(s) in a graph

For undirected graphs, head and tail is not defined. In this case
`tail_of`

returns vertices incident to the supplied edges, and
`head_of`

returns the other end(s) of the edge(s).

##### Usage

`tail_of(graph, es)`

##### Arguments

- graph
The input graph.

- es
The edges to query.

##### Value

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

##### See Also

Other structural queries: `[.igraph`

,
`[[.igraph`

, `adjacent_vertices`

,
`are_adjacent`

, `ends`

,
`get.edge.ids`

, `gorder`

,
`gsize`

, `head_of`

,
`incident_edges`

, `incident`

,
`is_directed`

, `neighbors`

*Documentation reproduced from package igraph, version 1.2.4.2, License: GPL (>= 2)*

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