Change the class of multiple columns [duplicate]

Answer 1

Try doing it the way below:

df <- data.frame(a = c(0, 0, 0), b = c(1, 1, 1), c = c(0, 0, 1), d = c(1, 1, 1), e = c(0, 0, 0))

df_updated <- df %>% mutate_at(vars(1:5), as.character)