creating new column with data filtering in R

Question

I have a data frame in r that includes a numeric column. I want to create a new column, which should contain a new value A if original is < 100 and a new value B if original is > 100.

Answer 1

Like this?

library(dplyr)
set.seed(100)

my_set = data.frame(x = rnorm(5, mean = 100))
#>          x
#> 1  99.49781
#> 2 100.13153
#> 3  99.92108
#> 4 100.88678
#> 5 100.11697

my_set %>% mutate(y = ifelse(x > 100, "A","B"))
#>           x y
#> 1 100.31863 A
#> 2  99.41821 B
#> 3 100.71453 A
#> 4  99.17474 B
#> 5  99.64014 B