Writing integer 7 as a character "007" in R

Question

I am trying to convert integer into string by using as.character function in R. But I need the string to be always of length 3. So 7 will get converted into 007, 10 into 010 and so on. I am wondering if there is some simple modification of as.character (or any other built-in R routine) which will quickly accomplish this.

Answer 1

See ?sprintf:

R> sprintf("%03d", c(7, 10))
[1] "007" "010"