StopUnlessBifurcating: Check that all nodes in a tree are bifurcating.
Description
Check that all nodes in a tree are bifurcating.
Usage
StopUnlessBifurcating(parent)
Arguments
parent
the first column of the edge matrix of a tree of class
phylo, i.e. tree$edge[, 1]
Value
Returns NULL, but will stop with an error message if a tree
does not appear to be bifurcating.