Modify terminal edge lengths to create "exactly" (see Details) equal tip heights (sum of edge lengths from root to tip)
forceEqualTipHeights(phy, baseline = "mean")An object of class phylo.
A character string giving a function to calculate the
baseline tip height, e.g. "min", "max" or "mean".
An object of class phylo with changed terminal
edge lengths.
What is "exactly" equal depends on the precision of the system
(.Machine); in any case the resulting phylogeny will pass
is.ultrametric with default arguments.