See the FAQ: How to do a minimal reproducible example reprex for beginners for a better way to pose questions that may depend on the data. Here's an example
mtcars$four <- ifelse(mtcars$cyl == 4,1,0)
head(mtcars)
#> mpg cyl disp hp drat wt qsec vs am gear carb four
#> Mazda RX4 21.0 6 160 110 3.90 2.620 16.46 0 1 4 4 0
#> Mazda RX4 Wag 21.0 6 160 110 3.90 2.875 17.02 0 1 4 4 0
#> Datsun 710 22.8 4 108 93 3.85 2.320 18.61 1 1 4 1 1
#> Hornet 4 Drive 21.4 6 258 110 3.08 3.215 19.44 1 0 3 1 0
#> Hornet Sportabout 18.7 8 360 175 3.15 3.440 17.02 0 0 3 2 0
#> Valiant 18.1 6 225 105 2.76 3.460 20.22 1 0 3 1 0