Nothing
bethe.tree <- function(tips, level.lengths = NULL, outgroup="O", outgroup.dist=1)
{
if(length(tips) != length(unique(tips)))
{
stop("Not all tips are unique.\n")
}
if(!is.null(level.lengths))
{
if(length(level.lengths) == 1)
{
level.lengths = rep(level.lengths, 2)
}
}
if(is.null(level.lengths) || length(level.lengths) == 0)
{
level.lengths = 1
}
groupings <- as.numeric(sapply(1:(length(tips)/2), function(x) rep(x,2)))
d <- level.lengths[1]
level.lengths <- level.lengths[-1]
tips <- lapply(split(tips,groupings), function(x) { sprintf("(%s:%d,%s:%d)",x[1],d,x[2],d)} )
if(length(tips) == 1)
{
read.tree(text=sprintf("(%s:%d, %s:%d);", tips[[1]], d, outgroup, outgroup.dist))
}
else
{
bethe.tree(tips, level.lengths, outgroup, outgroup.dist)
}
}
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