R: Add vertices to a graph

add_vertices {igraph} | R Documentation

## Add vertices to a graph

### Description

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()`, `add_edges()`, `delete_edges()`, `delete_vertices()`, `edge()`, `igraph-minus`, `path()`, `vertex()`

### Examples

    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)

[Package igraph version 1.3.1 Index]