Transform a vector into a format that will be sorted in descending order.
This is useful within arrange().
Examples
desc(1:10)
#> [1] -1 -2 -3 -4 -5 -6 -7 -8 -9 -10
desc(factor(letters))
#> [1] -1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 -14 -15 -16 -17
#> [18] -18 -19 -20 -21 -22 -23 -24 -25 -26
first_day <- seq(as.Date("1910/1/1"), as.Date("1920/1/1"), "years")
desc(first_day)
#> [1] 21915 21550 21185 20819 20454 20089 19724 19358 18993 18628 18263
starwars %>% arrange(desc(mass))
#> # A tibble: 87 × 14
#> name height mass hair_color skin_color eye_color birth_year sex
#> <chr> <int> <dbl> <chr> <chr> <chr> <dbl> <chr>
#> 1 Jabba De… 175 1358 NA green-tan… orange 600 herm…
#> 2 Grievous 216 159 none brown, wh… green, y… NA male
#> 3 IG-88 200 140 none metal red 15 none
#> 4 Darth Va… 202 136 none white yellow 41.9 male
#> 5 Tarfful 234 136 brown brown blue NA male
#> 6 Owen Lars 178 120 brown, gr… light blue 52 male
#> 7 Bossk 190 113 none green red 53 male
#> 8 Chewbacca 228 112 brown unknown blue 200 male
#> 9 Jek Tono… 180 110 brown fair blue NA male
#> 10 Dexter J… 198 102 none brown yellow NA male
#> # ℹ 77 more rows
#> # ℹ 6 more variables: gender <chr>, homeworld <chr>, species <chr>,
#> # films <list>, vehicles <list>, starships <list>