stree {ape} | R Documentation

## Generates Systematic Regular Trees

### Description

This function generates trees with regular shapes.

### Usage

    stree(n, type = "star", tip.label = NULL)

### Arguments

`n` | an integer giving the number of tips in the tree.
`type` | a character string specifying the type of tree to generate; four choices are possible: `"star"`, `"balanced"`, `"left"`, `"right"`, or any unambiguous abbreviation of these.
`tip.label` | a character vector giving the tip labels; if not specified, the tips "t1", "t2", ..., are given.

### Details

The types of trees generated are:

- “star”a star (or comb) tree with a single internal node.

- “balanced”a fully balanced dichotomous rooted tree; `n` must be a power of 2 (2, 4, 8, ...).

- “left”a fully unbalanced rooted tree where the largest clade is on the left-hand side when the tree is plotted upwards.

- “right”same than above but in the other direction.

### Value

An object of class `"phylo"`.

### Author(s)

Emmanuel Paradis

### See Also

`compute.brlen`, `rtree`

### Examples

    layout(matrix(1:4, 2, 2))
    plot(stree(100))
    plot(stree(128, "balanced"))
    plot(stree(100, "left"))
    plot(stree(100, "right"))

[Package ape version 4.1 Index]