Output formats (HTML, PDF, Word) in R Programming - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this R code generating an HTML report?

Consider this R code snippet that uses rmarkdown to create an HTML report. What will be the output file format?

R Programming

library(rmarkdown)
rmarkdown::render('report.Rmd', output_format = 'html_document')

A A PDF file named 'report.pdf' is created

B No file is created; this code only prints to console

C A Word document named 'report.docx' is created

D An HTML file named 'report.html' is created

💡 Hint

Check the output_format argument in the render function.

The render function with output_format = 'html_document' creates an HTML file with .html extension.

❓ Predict Output

intermediate

What output file is generated by this R code for PDF?

Given this R code snippet, what output file will be created?

R Programming

library(rmarkdown)
rmarkdown::render('analysis.Rmd', output_format = 'pdf_document')

A A PDF file named 'analysis.pdf' is created

B A Word document named 'analysis.docx' is created

C An HTML file named 'analysis.html' is created

D No file is created; the code only previews the report

💡 Hint

Look at the output_format parameter value.

The 'pdf_document' output format creates a PDF file with .pdf extension.

❓ Predict Output

advanced

What is the output file when rendering to Word format?

What file does this R code create?

R Programming

library(rmarkdown)
rmarkdown::render('summary.Rmd', output_format = 'word_document')

A An HTML file named 'summary.html' is created

B A Word document named 'summary.docx' is created

C A PDF file named 'summary.pdf' is created

D The code throws an error because 'word_document' is invalid

💡 Hint

Check the output_format argument for Word documents.

The 'word_document' output format creates a Word file with .docx extension.

🧠 Conceptual

advanced

Which output format supports interactive HTML widgets in R Markdown?

You want to include interactive plots in your report. Which output format should you choose?

A md_document

B word_document

C html_document

D pdf_document

💡 Hint

Interactive widgets need a web-based format.

Only 'html_document' supports interactive HTML widgets like plotly or leaflet.

❓ Predict Output

expert

What error occurs when rendering to PDF without LaTeX installed?

What happens if you run this code on a system without LaTeX installed?

R Programming

library(rmarkdown)
rmarkdown::render('report.Rmd', output_format = 'pdf_document')

A Error: LaTeX installation not found. Please install LaTeX to generate PDF

B Error: pandoc document conversion failed with error 43

C The PDF file is created successfully

D The code runs but produces an empty PDF file

💡 Hint

PDF generation requires LaTeX software installed on your computer.

Without LaTeX, rmarkdown cannot create PDFs and shows an error about missing LaTeX.

Practice

1. What is the main purpose of using rmarkdown::render() in R?

easy

A. To create interactive Shiny web apps

B. To install R packages automatically

C. To run R scripts line by line in the console

D. To convert R Markdown files into output formats like HTML, PDF, or Word

Solution

1. Step 1: Understand the function purpose

   rmarkdown::render() is designed to take an R Markdown file and produce a finished document in a chosen format.

2. Step 2: Identify output formats

   This function supports output formats like HTML, PDF, and Word, converting the markdown content accordingly.

3. Final Answer:

   To convert R Markdown files into output formats like HTML, PDF, or Word -> Option D

4. Quick Check:

   rmarkdown::render() = convert to output formats [OK]

Hint: Remember: render() means 'make output file' [OK]

Common Mistakes:

• Confusing render() with package installation
• Thinking render() runs code interactively
• Mixing render() with Shiny app creation

2. Which of the following is the correct way to specify PDF output in rmarkdown::render()?

easy

A. rmarkdown::render('file.Rmd', output_format = 'pdf_document')

B. rmarkdown::render('file.Rmd', output_format = 'pdf')

C. rmarkdown::render('file.Rmd', output_format = 'PDF')

D. rmarkdown::render('file.Rmd', output_format = 'pdfOutput')

Solution

1. Step 1: Recall correct output format names

   The official output format for PDF in rmarkdown is exactly 'pdf_document'.

2. Step 2: Check case sensitivity and spelling

   Incorrect names such as 'PDF', 'pdf', or 'pdfOutput' will cause errors.

3. Final Answer:

   rmarkdown::render('file.Rmd', output_format = 'pdf_document') -> Option A

4. Quick Check:

   PDF output format = 'pdf_document' [OK]

Hint: Use exact format names like 'pdf_document' [OK]

Common Mistakes:

• Using 'pdf' instead of 'pdf_document'
• Ignoring case sensitivity
• Adding extra words like 'Output'

3. Given the code:

rmarkdown::render('report.Rmd', output_format = 'word_document')

What will be the output file type?

medium

A. A Word (.docx) file

B. A PDF file

C. An HTML file

D. An R script file

Solution

1. Step 1: Identify the output format argument

   The argument output_format = 'word_document' tells R to create a Word document.

2. Step 2: Understand the file type generated

   This produces a .docx file, which is the standard Word document format.

3. Final Answer:

   A Word (.docx) file -> Option A

4. Quick Check:

   word_document output = Word file [OK]

Hint: Match output_format to file type extension [OK]

Common Mistakes:

• Confusing word_document with HTML or PDF
• Expecting an R script output
• Not recognizing .docx as Word format

4. You try to create a PDF from R Markdown using:

rmarkdown::render('doc.Rmd', output_format = 'pdf_document')

but get an error about missing LaTeX installation. What should you do?

medium

A. Restart RStudio and try again

B. Change output_format to 'html_document'

C. Install a LaTeX distribution like TinyTeX or MiKTeX

D. Remove all code chunks from the Rmd file

Solution

1. Step 1: Understand the error cause

   PDF output requires LaTeX software to convert markdown to PDF, which is missing.

2. Step 2: Fix by installing LaTeX

   Installing a LaTeX distribution like TinyTeX or MiKTeX provides the needed tools to create PDFs.

3. Final Answer:

   Install a LaTeX distribution like TinyTeX or MiKTeX -> Option C

4. Quick Check:

   Missing LaTeX = install LaTeX [OK]

Hint: PDF needs LaTeX installed to work [OK]

Common Mistakes:

• Ignoring the LaTeX requirement
• Changing output format without fixing LaTeX
• Restarting RStudio without installing LaTeX

5. You want to create an HTML report from an R Markdown file but also include a Word version automatically in a single render call. Which approach is best?

hard

A. Set output_format = c('html_document', 'word_document') in one render call

B. Call rmarkdown::render() twice with output_format = 'html_document' and then 'word_document'

C. Use output_format = 'pdf_document' and rename the file to .html and .docx

D. Create the HTML file manually and copy-paste content into Word

Solution

1. Step 1: Understand render() output_format argument

   The output_format argument does not accept multiple formats as a vector in a single call.

2. Step 2: Use multiple render calls

   Calling rmarkdown::render() twice with different output_format values is the correct way to generate multiple output files.

3. Final Answer:

   Call rmarkdown::render() twice with output_format = 'html_document' and then 'word_document' -> Option B

4. Quick Check:

   Multiple formats require multiple render calls [OK]

Hint: Use separate render calls for each output format [OK]

Common Mistakes:

• Thinking render can't handle multiple formats at once
• Renaming files without proper conversion
• Copy-pasting instead of automated rendering