is.ultrametric {ape}R Documentation

Test if a Tree is Ultrametric

Description

This function computes the distances from each tip to the root: if the variance of these distances is null, the tree is considered as ultrametric.

Usage

is.ultrametric(phy, tol = .Machine$double.eps^0.5)

Arguments

phy an object of class "phylo".
tol a numeric >= 0, variation below this value are considered non-significant (see details).

Details

The default value for tol is based on the numerical characteristics of the machine R is running on.

Value

a logical: TRUE if the tree is ultrametric, FALSE otherwise.

Author(s)

Emmanuel Paradis paradis@isem.univ-montp2.fr

See Also

is.binary.tree, .Machine


[Package ape version 1.7 Index]