Recursive vectors (lists)

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1. Draw the following lists as nested sets:

1. list(a, b, list(c, d), list(e, f))
2. list(list(list(list(list(list(a)))))) There are a variety of ways to draw these graphs. You could use various diagramming, drawing, or presentation software, including Adobe Illustrator, Inkscape, PowerPoint, Keynote, and Google Slides.

The nested set diagram for list(a, b, list(c, d), list(e, f)) is:

The nested set diagram for list(list(list(list(list(list(a)))))) is:

2. What happens if you subset a tibble as if you’re subsetting a list? What are the key differences between a list and a tibble?

Subsetting a tibble works the same way as a list; a data frame can be thought of as a list of columns. The key difference between a list and a tibble is that all the elements (columns) of a tibble must have the same length (number of rows). Lists can have vectors with different lengths as elements.

x <- tibble(a = 1:2, b = 3:4)
x[["a"]]

[1] 1 2

x["a"]

x[1]

x[1, ]