`root.tree` <-
function(nodematrix,outgroup)
{
node<-change.root(nodematrix,nodematrix[outgroup,1])
nodes<-node$nodes
oldroot<-node$rootnode
rootnode<-matrix(-9,1,dim(nodematrix)[2])
rootnode[1,2]<-outgroup
rootnode[1,3]<-oldroot
if(nodes[oldroot,2]==outgroup)
nodes[oldroot,2]<-nodes[oldroot,4]
if(nodes[oldroot,3]==outgroup)
nodes[oldroot,3]<-nodes[oldroot,4]
nodes[oldroot,4]<-nodes[outgroup,4]/2
nodes[outgroup,4]<-nodes[outgroup,4]/2
nodes[oldroot,1]<-dim(nodes)[1]+1
nodes[outgroup,1]<-dim(nodes)[1]+1
roottree<-rbind(nodes,rootnode)
return(roottree)
}
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