Logical (boolean) type in R Programming - Cheat Sheet & Quick Revision

Recall & Review

beginner

What values does the logical (boolean) type represent in R?

The logical type in R represents two main values: TRUE and FALSE. It is used to store truth values.

beginner

How do you create a logical vector with TRUE and FALSE values in R?

You can create a logical vector using the c() function, for example: c(TRUE, FALSE, TRUE).

beginner

What is the result of the expression 5 > 3 in R?

The expression 5 > 3 evaluates to TRUE because 5 is greater than 3.

intermediate

How does R treat the logical values TRUE and FALSE when used in arithmetic operations?

In arithmetic, TRUE is treated as 1 and FALSE as 0. For example, TRUE + TRUE equals 2.

intermediate

What function can you use to check if a value is logical in R?

You can use the is.logical() function to check if a value or vector is of logical type.

Which of the following is a logical value in R?

A 1

B "TRUE"

C 0

D TRUE

TRUE is a logical value. "TRUE" is a string, and 1 and 0 are numeric.

What does the expression is.logical(c(TRUE, FALSE, TRUE)) return?

A TRUE

B FALSE

C Error

D NULL

The vector contains logical values, so is.logical() returns TRUE.

What is the output of TRUE + FALSE in R?

A 0

B 1

C TRUE

D FALSE

TRUE is treated as 1 and FALSE as 0, so the sum is 1.

Which operator is used to compare two values and return a logical result?

A >

B +

C *

D -

The > operator compares values and returns TRUE or FALSE.

What is the class of the value FALSE in R?

A "numeric"

B "character"

C "logical"

D "integer"

FALSE is of class logical.

Explain what the logical (boolean) type is in R and give examples of how it is used.

Think about how R stores yes/no or true/false answers.

Describe how logical values behave when used in arithmetic operations in R.

Consider how R treats TRUE and FALSE as numbers.