Running R code in R Programming - Cheat Sheet & Quick Revision

Recall & Review

beginner

How do you run a single line of R code in the R console?

You type the line of code and press Enter. The R console then executes the code and shows the result.

beginner

What is the purpose of the source() function in R?

The source() function runs all the R code saved in a file. It helps you run scripts instead of typing code line by line.

beginner

What happens when you run print("Hello, world!") in R?

R shows the text Hello, world! in the console. The print() function displays the message on the screen.

beginner

How can you run multiple lines of R code at once in RStudio?

You select the lines you want to run and press Ctrl+Enter (Cmd+Enter on Mac). This sends the selected code to the console to run together.

beginner

What is the difference between running code in the R console and running code in an R script file?

Running code in the console executes one line at a time immediately. Running code in a script file lets you save many lines and run them all at once or in parts.

Which function runs all the R code saved in a file?

A source()

B run()

C execute()

D load()

The source() function runs all the R code saved in a file.

How do you run selected lines of code in RStudio?

A Press Ctrl+S

B Press Ctrl+Enter (Cmd+Enter on Mac)

C Press Ctrl+R

D Press Ctrl+C

Selecting lines and pressing Ctrl+Enter (Cmd+Enter on Mac) runs the selected code in RStudio.

What does the print() function do in R?

A Stops the program

B Saves the code to a file

C Runs a script file

D Displays output in the console

The print() function shows the given message or value in the console.

What happens when you press Enter after typing code in the R console?

A The code is saved but not run

B The console clears

C The code runs and shows the result

D The program exits

Pressing Enter runs the typed code immediately and shows the output.

Which is true about running code in an R script file?

A You can run many lines at once

B You can only run one line at a time

C It does not show output

D It only works in the console

An R script file lets you save and run many lines of code together.

Explain how to run R code using the console and using a script file.

Think about immediate execution vs saved scripts.

Describe how you can run multiple lines of code at once in RStudio.

Focus on keyboard shortcuts and selection.