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.
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(),
complementer(),
compose(),
connect(),
contract(),
delete_edges(),
delete_vertices(),
difference(),
difference.igraph(),
disjoint_union(),
edge(),
igraph-minus,
intersection(),
intersection.igraph(),
path(),
permute(),
rep.igraph(),
reverse_edges(),
simplify(),
union(),
union.igraph(),
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
#> IGRAPH ee15b19 D--- 5 4 --
#> + attr: color (v/c)
#> + edges from ee15b19:
#> [1] 1->2 2->3 3->4 4->5
V(g)[[]]
#> + 5/5 vertices, from ee15b19:
#> color
#> 1 red
#> 2 red
#> 3 red
#> 4 green
#> 5 green
plot(g)
