1 Intrinsic attributes: mode and length

2 Changing the length of an object

3 Getting and setting attributes

4 The class of an object

> z <- 0:9
> digit <- as.character(z)
> digit
 [1] "0" "1" "2" "3" "4" "5" "6" "7" "8" "9"
> d <- as.integer(digit)
> d
 [1] 0 1 2 3 4 5 6 7 8 9
> 

> e <- numeric()
> e
numeric(0)
> e[3] <- 17
> e
[1] NA NA 17
> alpha <- 1:10
> alpha <- alpha[2 * 1:5]
> alpha
[1]  2  4  6  8 10
> length(alpha) <- 3
> alpha
[1] 2 4 6
> 

> attr(z, "dim") <- c(10, 10)

> winter
> unclass(winter)