% Generated by roxygen2: do not edit by hand
 % Please edit documentation in R/tree-utilities.R

 \name{getRoot}
 \alias{getRoot}
 \title{getRoot}
 \usage{
 getRoot(tr)
 }
 \arguments{
 \item{tr}{phylo object}
 }
 \value{
 root number
 }
 \description{
 get the root number
 }
 \author{
 Guangchuang Yu
 }