取消引用R dplyr函数中的函数列表 [英] unquote a list of functions inside R dplyr functions
本文介绍了取消引用R dplyr函数中的函数列表的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我试图将函数列表传递给dplyr summerize_at
函数并收到警告:
I was trying to pass a list of functions into dplyr summerize_at
function and got a warning:
library(tidyverse)
library(purrr)
p <- c(0.2, 0.5, 0.8)
p_names <- map_chr(p, ~paste0(.x*100, "%"))
p_funs <- map(p, ~partial(quantile, probs = .x, na.rm = TRUE)) %>%
set_names(nm = p_names)
mtcars %>%
group_by(cyl) %>%
summarize_at(vars(mpg), funs(!!!p_funs))
#> Warning: funs() is soft deprecated as of dplyr 0.8.0
#> please use list() instead
#>
#> # Before:
#> funs(name = f(.)
#>
#> # After:
#> list(name = ~f(.))
#> This warning is displayed once per session.
#> # A tibble: 3 x 4
#> cyl `20%` `50%` `80%`
#> <dbl> <dbl> <dbl> <dbl>
#> 1 4 22.8 26 30.4
#> 2 6 18.3 19.7 21
#> 3 8 13.9 15.2 16.8
然后我将 funs
更改为<$
mtcars %>%
group_by(cyl) %>%
summarize_at(vars(mpg), list(~ !!!p_funs))
#> Error in !p_funs: invalid argument type
mtcars %>%
group_by(cyl) %>%
summarize_at(vars(mpg), list(~ {{p_funs}}))
#> Error: Column `mpg` must be length 1 (a summary value), not 3
推荐答案
list
不支持拼接( !!!
),使用 list2
或 lst
代替:
list
doesn't support splicing (!!!
), use list2
or lst
instead :
mtcars %>%
group_by(cyl) %>%
summarize_at(vars(mpg), rlang::list2(!!!p_funs))
# # A tibble: 3 x 4
# cyl `20%` `50%` `80%`
# <dbl> <dbl> <dbl> <dbl>
# 1 4 22.8 26 30.4
# 2 6 18.3 19.7 21
# 3 8 13.9 15.2 16.8
mtcars %>%
group_by(cyl) %>%
summarize_at(vars(mpg), lst(!!!p_funs))
# # A tibble: 3 x 4
# cyl `20%` `50%` `80%`
# <dbl> <dbl> <dbl> <dbl>
# 1 4 22.8 26 30.4
# 2 6 18.3 19.7 21
# 3 8 13.9 15.2 16.8
尽管这里最简单的方法是:
Though here the simplest is just to do :
mtcars %>%
group_by(cyl) %>%
summarize_at(vars(mpg), p_funs)
# # A tibble: 3 x 4
# cyl `20%` `50%` `80%`
# <dbl> <dbl> <dbl> <dbl>
# 1 4 22.8 26 30.4
# 2 6 18.3 19.7 21
# 3 8 13.9 15.2 16.8
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