R Programming Basics

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Questions and Answers

Which data type is most suitable for storing whole numbers in R?

character
logical
numeric
integer (correct)

Given the R code `x <- 5; if(x > 3) { print("Greater than 3") } else { print("Less than or equal to 3") }`, what will be the output?

TRUE
Greater than 3 (correct)
FALSE
Less than or equal to 3

Which function efficiently generates a sequence of numbers in R?

list()
seq() (correct)
rep()
c()

What is the result of `length(c(1, 2, 3, 4, 5))`?

5 (D) Signup and view all the answers

If `my_matrix` is a matrix, how do you correctly access the element in the 3rd row and 2nd column?

my_matrix[3, 2] (A) Signup and view all the answers

Which option is not a fundamental data structure in R?

table (C) Signup and view all the answers

Which function is the standard way to import data from a CSV file into R?

read.csv() (D) Signup and view all the answers

What does the `$` operator accomplish in R?

To access elements within a list or data frame by name (D) Signup and view all the answers

Which function provides a concise overview of the structure of an R object?

str() (D) Signup and view all the answers

What is the result of the modulo operation `10 %% 3` in R?

1 (C) Signup and view all the answers

How should you install a new package in R?

install.packages() (B) Signup and view all the answers

What is the primary function of `library()` in R?

To load and attach a package (B) Signup and view all the answers

Which of the following represents a valid logical operator in R?

& (B) Signup and view all the answers

What is the result of the logical operation `TRUE && FALSE` in R?

FALSE (C) Signup and view all the answers

Which function is specifically used to create a factor variable in R?

factor() (B) Signup and view all the answers

What is the outcome of running `tolower("HELLO WORLD")` in R?

hello world (A) Signup and view all the answers

Which function is the most appropriate for merging multiple vectors into a data frame as columns?

cbind() (C) Signup and view all the answers

Which of the following is the correct way to replace all missing values (NA) in a data frame named `df` with 0?

<code>df[is.na(df)] <- 0</code> (B) Signup and view all the answers

What is the main purpose of the `apply()` function in R?

To apply a function over the rows or columns of a matrix or array. (C) Signup and view all the answers

Which function in R is used to create a contingency table from categorical data?

table() (D) Signup and view all the answers

Flashcards

Integer Data Type in R

The data type used for storing whole numbers (integers) in R.

seq() function in R

This function creates a sequence of numbers in R.