Debugging If Loops in R

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Questions and Answers

What is wrong with the following R code that checks if a number is equal to 5?

The comparison operator should be = instead of ==.
The comparison operator should be == instead of =. (correct)
The variable num should be a string.
The print statement should be outside the if-else block.

What command do you use to create a copy of a repository from GitHub?

git pull url
git fetch url
git clone url (correct)
git copy url

What is the purpose of the git add command?

To push changes to a remote repository
To view the commit history
To commit changes to the repository
To stage changes for the next commit (correct)

How do you view the commit history in Git?

git log (C) Signup and view all the answers

What command is used to create a new branch in Git?

git branch new_branch (A) Signup and view all the answers

What is the first step in creating a new Git repository?

git init (A) Signup and view all the answers

What command is used to commit changes to the repository?

git commit (C) Signup and view all the answers

What is the primary purpose of the str() function in R?

To display the structure of an object (C) Signup and view all the answers

How do you list all files, including hidden ones, in a directory in Linux?

ls -al (A) Signup and view all the answers

What is the purpose of the install.packages() function in R?

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

How do you change the permissions of a file in Linux?

chmod (D) Signup and view all the answers

What is the purpose of the data.frame() function in R?

To create a data frame (B) Signup and view all the answers

How do you display the contents of a file in Linux?

cat (D) Signup and view all the answers

What command is used to find patterns in files in Linux?

grep (D) Signup and view all the answers

How do you check the current directory you are in in Linux?

pwd (C) Signup and view all the answers

Study Notes

Debugging If Loops in R

In R, a single equal sign = is used for assignment, not for comparison.
A double equal sign == is used for comparison in R, including checking if a number is equal to a certain value.
Using a single equal sign = in a conditional statement will result in incorrect syntax and error.
The correct syntax for checking if a number is equal to 5 is num == 5.

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Description

This quiz assesses your understanding of debugging concepts in R programming, specifically in if-else statements. Identify the correct comparison operator and logical mistakes in R code.