ancestor <-
function(tree, tip1, tip2)
{
ance1 <- tree$edge[which(tree$edge[, 2] == tip1), 1]
ance2 <- tree$edge[which(tree$edge[, 2] == tip2), 1]
mi <- min(tree$edge[, 1])
for (i in 1 : (tree$Nnode - 1))
{
if (ance1[i] > mi) ance1[i + 1] <- tree$edge[which(tree$edge[,2] == ance1[i]), 1]
else break()
}
for (j in 1 : (tree$Nnode - 1))
{
if (ance2[j] > mi) ance2[j + 1] <- tree$edge[which(tree$edge[,2] == ance2[j]), 1]
else break()
}
node <- max(intersect(ance1, ance2))
return(node)
}
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