tidyr: multiple unnesting with varying NA counts

Question

I\'m confused about some tidyr behavior. I can unnest a single response like this:

library(tidyr)

resp1 <- c(\"A\", \"B; A\", \"B\", NA, \"B\")
resp2 <         


        

Answer 1

In addition to Psidom answer: by default, unnest drops additional list columns (if row duplication is required).

Use .drop = FALSE argument to keep other columns.

Line unnest(resp1) %>% unnest(resp2) %>% unnest(resp3) becomes:

unnest(resp1, .drop = FALSE) %>% unnest(resp2, .drop = FALSE) %>% unnest(resp3)