# is.binary

From ape v5.4
by Emmanuel Paradis

##### Test for Binary Tree

This function tests whether a phylogenetic tree is binary.

- Keywords
- logic

##### Usage

```
is.binary(phy)
# S3 method for phylo
is.binary(phy)
# S3 method for multiPhylo
is.binary(phy)
# S3 method for tree
is.binary(phy)
```

##### Arguments

- phy
an object of class

`"phylo"`

or`"multiPhylo"`

.

##### Details

The test differs whether the tree is rooted or not. An urooted tree is considered binary if all its nodes are of degree three (i.e., three edges connect to each node). A rooted tree is considered binary if all nodes (including the root node) have exactly two descendant nodes, so that they are of degree three expect the root which is of degree 2.

`is.binary.tree`

is deprecated and will be removed soon:
currently it calls `is.binary`

.

##### Value

a logical vector.

##### See Also

##### Examples

```
# NOT RUN {
is.binary(rtree(10))
is.binary(rtree(10, rooted = FALSE))
is.binary(stree(10))
x <- setNames(rmtree(10, 10), LETTERS[1:10])
is.binary(x)
# }
```

*Documentation reproduced from package ape, version 5.4, License: GPL-2 | GPL-3*

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