How display length of branches in phylogenetic tree

Question

Here I have code that draw simple phylogenetic tree from newick format:

library(ape)
t<-read.tree(text="(F:4,(  (D:2,E:2):1,(C:2,(B:1,A:1):1):1):1);")
plot(t,use.egde.length=TRUE)

i am"displaying" correct length of branches, but i want all branch to have labal with it.

edit: i want my plot to look like this: I was searching documentation, but I cannot find method to display length of branch in R. How can i do this ?

Answer 1

You can do it by extracting edge lengths and using edgelabels().

# Load package
library(ape)

# Create data
t <- read.tree(text="(F:4,((D:2,E:2):1,(C:2,(B:1,A:1):1):1):1);")
plot(t)
edgelabels(t$edge.length, bg="black", col="white", font=2)