Day 3 R questions

At the end of yesterday's class, I asked these questions. Here are the answers I was expecting.

1. xx <- c(1, 7, 4, 31, 29)
   defines a new variable, or vector, with five numbers in it. It does not get displayed, just gets stored.
2. xx
   prints the contents of our vector:
   [1] 1 7 4 31 29
3. xx[4]
   prints only the fourth element:
   [1] 31
4. xx[3] <- 7
assigns a 7 to the third element of vector xx. Does not print anything.
5. xx
prints the new vector
[1] 1 7 7 31 29