Functions

Question 1

Which function pulls up the documentation for an inputted function?

Answer 1

help() or ?

Ex: help(my_func)

Ex: ?my_func

Question 2

Which function reveals the arguments of an inputted function?

Answer 2

args()

Ex: args(my_func)

Question 3

What is the function construct recipe?

Answer 3

my_func <- function(arg1, arg2) {
body
}

Ex:
triple <- function(x) {
3 * x
}

Question 4

How does R figure out what a function should return?

Answer 4

The last line of the function is automatically returned.

We can also specify a return value by using return()

Question 5

How can you set a default value in a function?

Answer 5

Using =

Ex:
my_func <- function(a, b = 1) {
body
}

Question 6

What are R packages?

Answer 6

Bundles of code, data, documentation, and tests that are easy to share with others.

Question 7

What function installs the inputted package?

Answer 7

install.packages()

Ex: install.packages(“my_package”)

Question 8

What is CRAN (Comprehensive R Archive Network)?

Answer 8

A repository where thousands of packages are available.

Question 9

What is a search list?

Answer 9

A list of packages and environments that R looks through to find a variable or function you want to use.

Question 10

What function displays the search list?

Answer 10

search()

Question 11

Which function adds the inputted package to the search list?

Answer 11

library()

Ex: library(“my_package”)