Use this if you are using igraph from R

vertex {igraph} | R Documentation |

This is a helper function that simplifies adding and deleting vertices to/from graphs.

```
vertex(...)
vertices(...)
```

`...` |
See details below. |

`vertices`

is an alias for `vertex`

.

When adding vertices via `+`

, all unnamed arguments are interpreted
as vertex names of the new vertices. Named arguments are interpreted as
vertex attributes for the new vertices.

When deleting vertices via `-`

, all arguments of `vertex`

(or
`vertices`

) are concatenated via `c()`

and passed to
`delete_vertices`

.

A special object that can be used with together with igraph graphs and the plus and minus operators.

Other functions for manipulating graph structure:
`+.igraph()`

,
`add_edges()`

,
`add_vertices()`

,
`delete_edges()`

,
`delete_vertices()`

,
`edge()`

,
`igraph-minus`

,
`path()`

```
g <- make_(ring(10), with_vertex_(name = LETTERS[1:10])) +
vertices('X', 'Y')
g
plot(g)
```

[Package *igraph* version 1.3.5 Index]