How to split a number into digits in R

Question

I have a data frame with a numerical ID variable which identify the Primary, Secondary and Ultimate Sampling Units from a multistage sampling scheme. I want to split the origina

Answer 1

You could use for example use substring:

df <- data.frame(ID = c(501901, 501902))

splitted <- t(sapply(df$ID, function(x) substring(x, first=c(1,2,4), last=c(1,3,6))))
cbind(df, splitted)
#      ID 1  2   3
#1 501901 5 01 901
#2 501902 5 01 902