Create an ID (row number) column

Question

I need to create a column with unique ID, basically add the row number as an own column. My current data frame looks like this:

   V1  V2
1  23  45
2  45  4         


        

Answer 1

Here is a solution that keeps the dplyr piping format and places id in the first column, which may be preferred.

d %>% 
  mutate(id = rownames(.)) %>% 
  select(id, everything())