Operators

Question 1

<-

What does this operator do

Answer 1

Assign a value to a variable

x <- 10

Assigns the value 10 to x

Question 2

=

What does this operator do

Answer 2

Another way to assign a value to a variable

x = 10

Assigns the value 10 to x

Question 3

?

What does this operator do

Answer 3

acts as help button
opens a webpage that provides details about the function

?mean

Will display the help information for the mean function

Question 4

c()

What does this operator do

Answer 4

Combines values into a vector

my_vector <- c(1, 2, 3, 4, 5)

Question 5

Pipe Operator

%>%

What does this operator do

Answer 5

Take result of one command and send to next command

filter (age > 30) %>%
select(name, age)

result = data %>%

can think of it as saying “and then”

Question 6

:

What does this operator do

Answer 6

Creates a sequence of numbers

seq <- 1:5

Creates the vector c(1, 2, 3, 4, 5)

Question 7

$

What does this operator do

Answer 7

Extract specific columns from a data frame

ages <- data$age

This will output the age column (eg 25, 30, 32)

Question 8

+

What does this operator do

Answer 8

Add numbers

sum <- 5 + 3

Result is 8

Question 9

-

What does this operator do

Answer 9

Subtract numbers

difference <- 10 - 4

Result is 6

Question 10

*

What does this operator do

Answer 10

Multiply numbers

product <- 6 * 7

Result is 42

Question 11

/

What does this operator do

Answer 11

Divide numbers

quotient <- 20 / 4

Result is 5

Question 12

==

What does this operator do

Answer 12

Check if two values are equal

is_equal <- (x == 10)

Returns TRUE if x is 10

Question 13

!=

What does this operator do

Answer 13

Check if two values are not equal

is.not.equal <- (y != 20)

Returns TRUE if y is not 20

Question 14

<

What does this operator do

Answer 14

Check if left value is less than right value

is_less <- (5 < 10)

Returns TRUE

Question 15

>

What does this operator do

Answer 15

Check if left value is greater than right value

is.greater = (15 > 10)

Returns TRUE

Question 16

<=

What does this operator do

Answer 16

Check if left value is less than or equal to right value

is.less.equal <- (10 <= 10)

Returns TRUE

Question 17

> =

What does this operator do

Answer 17

Check if left value is greater than or equal to right value

is.greater.equal = (15 >= 20)

Returns FALSE

Question 18

&

What does this operator do

Answer 18

logical AND operator

BOTH conditions must be TRUE

condition <- (x == 10 & y == 20)

TRUE if both are true

Question 19

|

What does this operator do

Answer 19

logical OR operator

at least ONE condition must be TRUE

condition <- (x == 10 | y == 10)

TRUE if either is true

Question 20

!

What does this operator do

Answer 20

logical NOT operator

negates truth value of a condition

not_condition <- !(x == 10)

TRUE if x is NOT equal to 10