[R] substr gives empty output

[Luigi Marongiu]

Dear all,
I have a string, let's say "testing", and I would like to extract in
sequence each letter (character) from it. But when I use substr() I only
properly get the first character, the rest is empty (""). What am I getting
wrong?
For example, I have this code:

>>>
x <- "testing"
k <- nchar(x)
for (i in 1:k) {
  y <- substr(x, i, 1)
  print(y)
}

	[[alternative HTML version deleted]]