Flatten list column in data frame with ID column

Question

My data frame contains the output of a survey with a select multiple question type. Some cells have multiple values.

df <- data.frame(a=1:3,b=I(list(1,1:2         


        

Answer 1

You can just use unnest from "tidyr":

library(tidyr)
unnest(df, b)
#   a b
# 1 1 1
# 2 2 1
# 3 2 2
# 4 3 1
# 5 3 2
# 6 3 3