use dplyr's summarise_each to return one row per function?

Question

I\'m using dplyr\'s summarise_each to apply a function to multiple columns of data. One thing that\'s nice is that you can apply multiple functions at once. Thing is, it\'

Answer 1

One option is to use purrr::map_df (really map_dfc to simplify back to a data.frame with bind_cols though map_df is fine for now) with a function that makes a vector of results of each function, i.e.

library(tidyverse)

iris %>% select(contains('Petal')) %>% 
    map_dfc(~c(min(.x), max(.x))) %>% 
    mutate(stat = c('min', 'max'))    # to add column of function names

#> # A tibble: 2 × 3
#>   Petal.Length Petal.Width  stat
#>                  
#> 1          1.0         0.1   min
#> 2          6.9         2.5   max