Nothing
# calculate minimum and maximum distance of any tip from the root
# distance from root = cumulative branch length from root to the clade
get_tree_span = function(tree, as_edge_count=FALSE){
Ntips = length(tree$tip.label)
Nnodes = tree$Nnode;
if(Nnodes==0) return(list(min_distance = 0, max_distance = 0))
results = get_min_max_tip_distance_from_root_CPP( Ntips = Ntips,
Nnodes = Nnodes,
Nedges = nrow(tree$edge),
tree_edge = as.vector(t(tree$edge))-1, # flatten in row-major format and make indices 0-based
edge_length = (if(as_edge_count || is.null(tree$edge.length)) numeric() else tree$edge.length));
return(list(min_distance = results$min_distance,
max_distance = results$max_distance));
}
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