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

Recall & Review

beginner

What is inline R code in R Markdown?

Inline R code lets you run R commands directly inside text. It shows the result right in the sentence when you knit the document.

beginner

How do you write inline R code in R Markdown?

Use a single backtick, then r, then your R code, and close with a backtick. Like this: `r 2 + 2`.

beginner

What will this inline R code output? `r paste('Hello', 'World')`

It will output: Hello World inside the text where the code is placed.

intermediate

Why use inline R code instead of writing results manually?

Inline R code keeps your document up-to-date automatically. If data or calculations change, the output updates when you knit again.

intermediate

Can inline R code include complex expressions or just simple values?

Inline R code can include any R expression, from simple numbers to complex functions, as long as it returns a value to show.

How do you write inline R code in R Markdown?

A `r your_code`

B ```r your_code ```

C <r>your_code</r>

D {{r your_code}}

Inline R code uses a single backtick, then r, then the code, and closes with a backtick.

What does inline R code do when you knit an R Markdown document?

A Deletes the code from the document

B Shows the code but does not run it

C Runs the code but hides the result

D Runs the code and shows the result inside the text

Inline R code runs and shows the result directly in the text output.

Which of these is a valid inline R code example?

A `r mean(c(1,2,3))`

B ```r mean(c(1,2,3))```

C <r>mean(c(1,2,3))</r>

D {{mean(c(1,2,3))}}

Only option D uses the correct inline R code syntax.

What happens if the inline R code contains an error?

A The code is ignored and no output is shown

B The knitting process stops with an error message

C The code runs but shows a blank space

D The document knits but shows the code as text

Errors in inline R code cause knitting to stop and show an error.

Why is inline R code useful in reports?

A It makes the document run faster

B It hides all code from the reader

C It updates results automatically when data changes

D It formats text with colors

Inline R code keeps results current by running code each time you knit.

Explain how to use inline R code in an R Markdown document and why it is helpful.

Think about how you mix code and text in one sentence.

Describe a situation where inline R code would save you time compared to writing results manually.

Imagine you have a report with numbers that change often.