Given a vector v <- c(1, 10, 22) and a constant natural number say c <- 3 how can I expand v with integers in a window of size c. So the vector would become w (i.e. 1 is expanded three integers to each side, the integers -2, -1, 0, 1, 2, 3, 4) :
> w
[1] -2 -1 0 1 2 3 4 7 8 9 10 11 12 13 19 20 21 22 23 24 25