Integer type in R Programming - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an integer type in R?

An integer type in R is a data type used to store whole numbers without decimal points. It is different from numeric (double) which can store decimal numbers.

beginner

How do you create an integer in R?

You create an integer in R by adding an L suffix to a number, for example: 5L creates an integer 5.

intermediate

What is the difference between 5 and 5L in R?

5 is a numeric (double) type by default, while 5L is an integer type. They behave differently in some operations and use different memory.

beginner

How can you check if a variable is an integer in R?

Use the function is.integer(x). It returns TRUE if x is an integer type, otherwise FALSE.

intermediate

Why might you want to use integer type instead of numeric in R?

Using integer type can save memory and improve performance when you only need whole numbers. It also helps avoid unexpected decimal calculations.

How do you explicitly create an integer value 10 in R?

A 10L

B 10.0

C "10"

D as.numeric(10)

Adding L after a number like 10L creates an integer in R.

What does the function is.integer(5) return in R?

A FALSE

B TRUE

C Error

D NA

5 is numeric (double) by default, so is.integer(5) returns FALSE.

Which of these is NOT a characteristic of integer type in R?

A Uses less memory than numeric

B Stores whole numbers

C Can store decimal numbers

D Created by adding L suffix

Integer type cannot store decimal numbers; that is for numeric type.

What will typeof(5L) return in R?

A "numeric"

B "integer"

C "double"

D "character"

5L is an integer, so typeof(5L) returns "integer".

Why might you choose integer type over numeric in R?

A To store decimal numbers

B To perform string operations

C To convert strings to numbers

D To save memory when storing whole numbers

Integer type uses less memory and is efficient for whole numbers.

Explain how to create and check an integer type variable in R.

Think about how R treats numbers by default and how to specify integer.

Describe the difference between numeric and integer types in R and why it matters.

Consider how numbers are stored and used in calculations.