# multi2di

From ape v2.1-1
by Emmanuel Paradis

##### Collapse and Resolve Multichotomies

These two functions collapse or resolve multichotomies in phylogenetic
trees (objects of class `"phylo"`

).

- Keywords
- manip

##### Usage

```
multi2di(phy, random = TRUE)
di2multi(phy, tol = 1e-08)
```

##### Arguments

- phy
- an object of class
`"phylo"`

. - random
- a logical value specifying whether to resolve the
multichotomies randomly (the default) or in the order they appear in
the tree (if
`random = FALSE`

). - tol
- a numeric value giving the tolerance to consider a branch length significantly greater than zero.

##### Details

`multi2di`

transforms all multichotomies into a series of
dichotomies with one (or several) branch(es) of length zero.

`di2multi`

deletes all branches smaller than `tol`

and
collapses the corresponding dichotomies into a multichotomy.

##### Value

- Both functions return an object of class
`"phylo"`

.

##### See Also

##### Examples

```
data(bird.families)
is.binary.tree(bird.families)
is.binary.tree(multi2di(bird.families))
all.equal(di2multi(multi2di(bird.families)), bird.families)
### To see the results of randomly resolving a trichotomy:
tr <- read.tree(text = "(a:1,b:1,c:1);")
layout(matrix(1:4, 2, 2))
for (i in 1:4)
plot(multi2di(tr), use.edge.length = FALSE, cex = 1.5)
layout(matrix(1))
```

*Documentation reproduced from package ape, version 2.1-1, License: GPL (>= 2)*

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