# tail_of

From igraph v1.0.1
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.connected`

, `are_adjacent`

;
`ecount`

, `gsize`

;
`ends`

, `get.edge`

,
`get.edges`

; `get.edge.ids`

;
`gorder`

, `vcount`

;
`head_of`

; `incident_edges`

;
`incident`

; `is.directed`

,
`is_directed`

; `neighbors`

*Documentation reproduced from package igraph, version 1.0.1, License: GPL (>= 2)*

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