# List exercises

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In the exercises below we cover the basics of lists. Before proceeding, first read section 6.1-6.2 of An Introduction to R, and the help pages for the `sum`

, `length`

, `strsplit`

, and `setdiff`

functions.

Answers to the exercises are available here.

**Exercise 1**

If:

`p `

and

`x `

,

then what is the value of `x[2]`

?

a. NULL

b. “A” “B” “C”

c. “7”

**Exercise 2**

If:

`w `

`v `

`x `

,

then which R statement will replace “A” in `x`

with “K”.

a. ` x[[2]] `

b. ` x[[2]][1] `

c. ` x[[1]][2] `

**Exercise 3**

If `a `

, 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 `

, write an R statement that will add 1 to each element of the first vector in `Newlist`

.

**Exercise 5**

If `b `

, write an R expression that will give all elements, except the second, of the first vector of `b`

.

**Exercise 6**

Let `x `

, write an R statement to add a new item z = “NewItem” to the list x.

**Exercise 7**

Consider `y `

, write an R statement that will assign new names “one”, “two” and “three” to the elements of y.

**Exercise 8**

If `x `

, write an R statement that will give the length of vector `r`

of `x`

.

**Exercise 9**

Let `string `

, 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 `

and

`q `

.

Write an R statement that will return all elements of q that are not in y, with the following result:

```
```[[1]]

[1] "A"

[[2]]

[1] "B"

[[3]]

[1] "C"

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