ape (version 1.10-1)

is.ultrametric: 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).

Value

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

Details

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

See Also

is.binary.tree, .Machine