graph.tree: Create tree graphs
In igraph: Network Analysis and Visualization

graph.tree

R Documentation

Create tree graphs

graph.tree() was renamed to make_tree() to create a more consistent API.

graph.tree(n, children = 2, mode = c("out", "in", "undirected"))

`n`	Number of vertices.
`children`	Integer scalar, the number of children of a vertex (except for leafs)
`mode`	Defines the direction of the edges. `out` indicates that the edges point from the parent to the children, `⁠in⁠` indicates that they point from the children to their parents, while `undirected` creates an undirected graph.