# add_vertices

From igraph v1.0.1
by Gabor Csardi

##### Add vertices to a graph

If attributes are supplied, and they are not present in the graph,
their values for the original vertices of the graph are set to
`NA`

.

##### Usage

`add_vertices(graph, nv, ..., attr = list())`

##### Arguments

- graph
The input graph.

- nv
The number of vertices to add.

- ...
Additional arguments, they must be named, and they will be added as vertex attributes, for the newly added vertices. See also details below.

- attr
A named list, its elements will be added as vertex attributes, for the newly added vertices. See also details below.

##### Value

The graph, with the vertices (and attributes) added.

##### See Also

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

;
`-.igraph`

, `igraph-minus`

;
`add.edges`

, `add_edges`

;
`delete.edges`

, `delete_edges`

;
`delete.vertices`

,
`delete_vertices`

; `edge`

,
`edges`

; `path`

;
`vertex`

, `vertices`

##### Examples

```
# NOT RUN {
g <- make_empty_graph() %>%
add_vertices(3, color = "red") %>%
add_vertices(2, color = "green") %>%
add_edges(c(1,2, 2,3, 3,4, 4,5))
g
V(g)[[]]
plot(g)
# }
```

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

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