rowwise steps

[EmilHvitfeldt]

Do something like this:

library(tidyverse)

tb <- tibble(c1 = rnorm(10),
             c2 = rnorm(10, 2),
             c3 = rnorm(10, 3),
             d1 = rnorm(10,6))

tb %>% 
  rowwise() %>% 
  mutate(sd = sd(c_across(starts_with("c")))) 
#> # A tibble: 10 × 5
#> # Rowwise: 
#>        c1    c2    c3    d1    sd
#>     <dbl> <dbl> <dbl> <dbl> <dbl>
#>  1  1.59  0.864  3.75  6.06 1.50 
#>  2  1.57  3.15   2.89  7.21 0.851
#>  3  1.42  2.23   1.40  5.17 0.474
#>  4  1.71  2.57   3.50  7.66 0.897
#>  5  1.24  1.82   3.07  5.77 0.937
#>  6  1.03  0.599  2.49  6.18 0.991
#>  7 -1.26  0.291  4.06  6.25 2.74 
#>  8 -0.500 1.45   2.55  4.84 1.54 
#>  9 -0.195 1.20   3.89  5.59 2.08 
#> 10 -0.216 1.20   4.25  6.63 2.28

Based on https://github.com/tidymodels/recipes/issues/949