STSCI 2120: Lecture 1

What do I need to start programming with R ?

• Only download R on cran.r-project.org

• Only download RStudio on posit.co

• Download both R and Rstudio

• Use posit cloud service without downloading anything

Which of the following is NOT true about RStudio?

• It is an Integrated Development Environment (IDE) for R

• It looks the same on Windows, Mac OS, and Linux

• It is a substitute for R

• It can be used for writing and running R code

What is the purpose of the 'sample' function in R?

• To install R packages

• To create sequences of numbers

• To randomly select elements from a vector

• To store data in R objects

What happens if you type an incomplete command and press Enter in RStudio?

• RStudio will execute the command immediately

• RStudio will return an error message

• RStudio will display a '+' prompt, waiting for the rest of the command

• RStudio will close automatically

How do you update R to the latest version?

• By reinstalling your operating system

• By running the 'update.packages' command

• By downloading the latest version from CRAN and installing it

• By restarting RStudio

What is an R package?

• A built-in feature of RStudio

• A collection of functions, data, and documentation

• A method to save R scripts

• A type of R object

How do you install a package in R?

• By typing the name of the package in the console

• By using the 'library' function

• By selecting the package from a menu in RStudio

• By using the 'install.packages' command

Which of the following statements about R objects is CORRECT?

• They are automatically saved to your computer’s hard drive

• They are temporary and disappear after R session ends

• They can store data and be called upon when needed

• They cannot be overwritten once created

What is vector recycling in R?

• A method to permanently resize vectors

• A technique where R repeats a shorter vector to match the length of a longer one

• A function to delete unused vectors

• A way to save memory by removing duplicate vectors

How to store the vector "1:10" in the variable "v" ?

• 1:10 = v

• v <- 1:10

• v <-> 1:10

• 1:10 <- v