Adding a column with consecutive numbers in R

Question

I apologize if this question is abhorrently simple, but I\'m looking for a way to just add a column of consecutive integers to a data frame (if my data frame has 200 observation

Answer 1

Or use dplyr.

library(dplyr)
df %>% mutate(observation = 1:n())

You might want it to be the first column of df.

df %>% mutate(observation = 1:n()) %>% select(observation, everything())