How to compare two columns in R data frame and return 0 or 1 in the third column based on the comparison?

Question

I have a dataframe with two columns(both are dates) and a million rows. I have to compare both the dates and return value in the third column. i.e if date in column A is greater

Answer 1

In base:

DF$C <- as.numeric(DF$A > DF$B)

In dplyr:

DF %>% 
  mutate(C = as.numeric(A > B))