# R/leafsfirst.tail.R In denpro: Visualization of Multivariate Functions, Sets, and Data

#### Defines functions leafsfirst.tail

```leafsfirst.tail<-function(dendat, rho=0, refe=NULL, dist.type="euclid")
{

n<-dim(dendat)[1]
d<-dim(dendat)[2]
pcfhigh<-dendat+rho
pcfdown<-dendat-rho
if (is.null(refe)){
refe<-matrix(0,1,d)
for (i in 1:d) refe[1,i]<-mean(dendat[,i])
refe<-refe[1:d]
}

distat<-sqrt(pituus(dendat-t(matrix(refe,d,n))))
lkm<-n
infopointer<-seq(1,lkm)
if (length(rho)==1) rho<-rep(rho,lkm)

# order the atoms for the level set with level "lev"

ord<-order(distat)
infopointer<-infopointer[ord]

# create tree

parent<-matrix(0,lkm,1)
child<-matrix(0,lkm,1)
sibling<-matrix(0,lkm,1)
volume<-matrix(0,lkm,1)

highestNext<-matrix(0,lkm,1)    #pointers to the nodes without parent
boundrec<-matrix(0,lkm,2*d) #for each node, the box which bounds all the c:dren

node<-lkm  #ord[lkm]  #the 1st child node is the one with the longest distance
parent[node]<-0
child[node]<-0
sibling[node]<-0

volume[node]<-1

beg<-node                 #first without parent
highestNext[node]<-0
note<-infopointer[node]   #note<-pcf\$nodefinder[infopointer[node]]
for (i in 1:d){
boundrec[node,2*i-1]<-pcfdown[note,i]
boundrec[node,2*i]<-pcfhigh[note,i]
}

j<-2
while (j<=lkm){
node<-lkm-j+1   #ord[lkm-j+1]

# lisaa "node" ensimmaiseksi listaan
highestNext[node]<-beg  #beg on listan tamanhetkinen ensimmainen
beg<-node

rec1<-matrix(0,2*d,1)  #luo sigleton
note<-infopointer[node]  #note<-pcf\$nodefinder[infopointer[node]]
for (i in 1:d){
rec1[2*i-1]<-pcfdown[note,i]
rec1[2*i]<-pcfhigh[note,i]
}
boundrec[node,]<-rec1

volume[node]<-1

curroot<-highestNext[beg]  #node on 1., listassa ainakin 2
prevroot<-beg
ekatouch<-0
while (curroot>0){
#rhocur<-rho[infopointer[node]]
istouch<-touchstep.tail(node,curroot,boundrec,child,sibling,
infopointer,pcfdown,pcfhigh,rho,dendat,
dist.type=dist.type)

if (istouch==1){

# paivita parent, child, sibling, volume
parent[curroot]<-node
if (ekatouch==0) ekatouch<-1 else ekatouch<-0
if (ekatouch==1){
child[node]<-curroot
}
else{  # since ekatouch==0, prevroot>0
sibling[lastsib]<-curroot
}

volume[node]<-volume[node]+volume[curroot]

# attach box of curroot
rec1<-boundrec[node,]
rec2<-boundrec[curroot,]
boundrec[node,]<-boundbox(rec1,rec2)
# poista "curroot" listasta
highestNext[prevroot]<-highestNext[curroot]

}
# if curroot was not removed, we update prevroot
# else curroot was removed, we update lastsib
if (istouch==0) prevroot<-curroot else lastsib<-curroot
curroot<-highestNext[curroot]
}
j<-j+1
}

root<-1 #ord[1]  #root is the barycenter

maxdis<-distat[ord[length(ord)]]
center<-t(dendat[infopointer,])

lf<-list(
root=root,
infopointer=infopointer,
refe=refe,maxdis=maxdis,
dendat=dendat)

return(lf)
}
```

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denpro documentation built on May 2, 2019, 8:55 a.m.