# BIONJ

From ape v2.7-3
by Emmanuel Paradis

##### Tree Estimation Based on an Improved Version of the NJ Algorithm

This function performs the BIONJ algorithm of Gascuel (1997).

- Keywords
- models

##### Usage

`bionj(X)`

##### Arguments

- X
- a distance matrix; may be an object of class
`"dist"`

.

##### Value

- an object of class
`"phylo"`

.

##### References

Gascuel, O. (1997) BIONJ: an improved version of the NJ algorithm
based on a simple model of sequence data.
*Molecular Biology and Evolution*, **14:**, 685--695.

##### See Also

##### Examples

```
### From Saitou and Nei (1987, Table 1):
x <- c(7, 8, 11, 13, 16, 13, 17, 5, 8, 10, 13,
10, 14, 5, 7, 10, 7, 11, 8, 11, 8, 12,
5, 6, 10, 9, 13, 8)
M <- matrix(0, 8, 8)
M[row(M) > col(M)] <- x
M[row(M) < col(M)] <- x
rownames(M) <- colnames(M) <- 1:8
tr <- bionj(M)
plot(tr, "u")
### a less theoretical example
data(woodmouse)
trw <- bionj(dist.dna(woodmouse))
plot(trw)
```

*Documentation reproduced from package ape, version 2.7-3, License: GPL (>= 2)*

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