List exercises

Exercise 2
If:
w <- c(2, 7, 8)
v <- c("A", "B", "C")
x <- list(w, v),
then which R statement will replace "A" in x with "K".
a. x[[2]] <- "K"
b. x[[2]][1] <- "K"
c. x[[1]][2] <- "K"

Exercise 3
If a <- list ("x"=5, "y"=10, "z"=15), which R statement will give the sum of all elements in a?
a. sum(a)
b. sum(list(a))
c. sum(unlist(a))

Exercise 4
If Newlist <- list(a=1:10, b="Good morning", c="Hi"), write an R statement that will add 1 to each element of the first vector in Newlist.

Exercise 5
If b <- list(a=1:10, c="Hello", d="AA"), write an R expression that will give all elements, except the second, of the first vector of b.

Exercise 6
Let x <- list(a=5:10, c="Hello", d="AA"), write an R statement to add a new item z = "NewItem" to the list x.

Exercise 7
Consider y <- list("a", "b", "c"), write an R statement that will assign new names "one", "two" and "three" to the elements of y.

Exercise 8
If x <- list(y=1:10, t="Hello", f="TT", r=5:20), write an R statement that will give the length of vector r of x.

Exercise 9
Let string <- "Grand Opening", write an R statement to split this string into two and return the following output:

[[1]]
[1] "Grand"

[[2]]
[1] "Opening"


Exercise 10
Let:
y <- list("a", "b", "c") and
q <- list("A", "B", "C", "a", "b", "c").
Write an R statement that will return all elements of q that are not in y, with the following result:

[[1]]
[1] "A"

[[3]]
[1] "C"


Want some extra practice with lists? Please take a look here

Related exercise sets:

Vectors and Functions A Primer in functional Programming in R (part -2) How to use basic dplyr functions Descriptive Analytics-Part 6: Interactive dashboard ( 1/2) List Vol.2 Exercises