R in 3 Months Week 7 (Functions)

Agenda

1. Housekeeping

2. Questions on Tidy Data?

3. Question on Function Arguments

4. Functions

5. Next Week

https://rin3fall2025.rfortherestofus.com/slides/slides-week-07.html

Housekeeping

Remaining Weeks

• Week 8: Advanced Data Wrangling, Part 3 (Data Merging and Exporting Data)

• Week 9: Advanced Data Viz, Part 1 (Highlighting and Decluttering)

• Week 10: Catch-Up Week

• Week 11: Advanced Data Viz, Part 2 (Explaining and Making Your Viz Sparkle)

• Week 12: Advanced Quarto

• Week 13: Wrap Up

Questions on Tidy Data?

Question on Function Arguments

I’m seeing a difference in the syntax used in the main video vs the solution video and am wondering if you can please explain the difference. In the main video, you use separate_longer_delim(cols = activities,... but the solution video uses separate_longer_delim(partyid,... without the use of cols =.

https://rfortherestofus.com/courses/r-in-3-months-fall-2025/lessons/tidy-data-rule-2-every-row-is-an-observation

https://rfortherestofus.com/courses/r-in-3-months-fall-2025/lessons/using-function-arguments

Functions

Functions as Recipes

• Print quantities
• Make function
• Explain how last item in function is returned
• Explain how objects created in function don’t exist in global environment
• Show how to add argument to function to calculate number of cookies

Advanced Functions

Next Week

• Course lessons cover data merging and data exporting

• Project assignment is to tidy your data with the various functions you have learned