Week 14: Iteration, purrr, and wrap-up

DATA 412/612 · December 9

Lectures

• 14.1 Vectors and Lists(PDF)
• 14.2 Iteration: Loops and purrr(PDF)
• 14.3 Course Wrap(PDF)
• purrr cheat sheet

Labs

• Lab 14: Vectors and Iteration(PDF)
• Lab 14 solutions (password)

Sample final exam

• Final exam, sample 1(PDF)
• Final exam, sample 2(PDF)

Additional readings

• R for Data Science: Iteration
• R for Data Science: A field guide to base R
• Jenny Bryan’s purrr tutorial
• What They Forgot to Teach You About R: Debugging R code

Discussion

• When is a for loop clearer than purrr::map(), and when is it the other way around?
• What does it mean for a vector to be atomic, and why does that matter when dates and numbers land in one column?