Podcast
Questions and Answers
What is wrong with the following R code that checks if a number is equal to 5?
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?
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?
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?
How do you view the commit history in Git?
What command is used to create a new branch in Git?
What command is used to create a new branch in Git?
What is the first step in creating a new Git repository?
What is the first step in creating a new Git repository?
What command is used to commit changes to the repository?
What command is used to commit changes to the repository?
What is the primary purpose of the str() function in R?
What is the primary purpose of the str() function in R?
How do you list all files, including hidden ones, in a directory in Linux?
How do you list all files, including hidden ones, in a directory in Linux?
What is the purpose of the install.packages() function in R?
What is the purpose of the install.packages() function in R?
How do you change the permissions of a file in Linux?
How do you change the permissions of a file in Linux?
What is the purpose of the data.frame() function in R?
What is the purpose of the data.frame() function in R?
How do you display the contents of a file in Linux?
How do you display the contents of a file in Linux?
What command is used to find patterns in files in Linux?
What command is used to find patterns in files in Linux?
How do you check the current directory you are in in Linux?
How do you check the current directory you are in in Linux?
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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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