Nothing
`descendant.pere` <-
function(genea){
iden.pere = unique(genea[,2])
nbre.pere = length(iden.pere)
# Initialisation des vecteur/matrice de résultat
desc.pere = matrix(NA,ncol=2,nrow=nbre.pere)
nbre.desc.pere = rep(NA,nbre.pere)
for(ip in 1:nbre.pere){
nbre.desc.pere[ip] = sum(genea[,2]==iden.pere[ip])
}
desc.pere[1,1] = 1
desc.pere[1,2] = nbre.desc.pere[1]
if(nbre.pere>1){
for(ip in 2:nbre.pere){
desc.pere[ip,1]=desc.pere[(ip-1),2]+1
desc.pere[ip,2]=desc.pere[ip,1]+nbre.desc.pere[ip]-1
}
}
desc.pere
}
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