is.ultrametric {ape} | R Documentation |
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.
is.ultrametric(phy, tol = .Machine$double.eps^0.5)
phy |
an object of class "phylo" . |
tol |
a numeric >= 0, variation below this value are considered non-significant (see details). |
The default value for tol
is based on the numerical
characteristics of the machine R is running on.
a logical: TRUE
if the tree is ultrametric, FALSE
otherwise.
Emmanuel Paradis paradis@isem.univ-montp2.fr