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r - 根据多个属性条件选择列

转载 作者:行者123 更新时间:2023-12-03 20:11:57 25 4
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我试图弄清楚如何使用dplyr::select_if有效地选择列。 dplyr 0.70中的starwars数据集是一个很好的数据集,可用于此目的:

> starwars
# A tibble: 87 x 13
name height mass hair_color skin_color eye_color birth_year gender homeworld species films vehicles starships
<chr> <int> <dbl> <chr> <chr> <chr> <dbl> <chr> <chr> <chr> <list> <list> <list>
1 Luke Skywalker 172 77 blond fair blue 19.0 male Tatooine Human <chr [5]> <chr [2]> <chr [2]>
2 C-3PO 167 75 <NA> gold yellow 112.0 <NA> Tatooine Droid <chr [6]> <chr [0]> <chr [0]>
3 R2-D2 96 32 <NA> white, blue red 33.0 <NA> Naboo Droid <chr [7]> <chr [0]> <chr [0]>
4 Darth Vader 202 136 none white yellow 41.9 male Tatooine Human <chr [4]> <chr [0]> <chr [1]>
5 Leia Organa 150 49 brown light brown 19.0 female Alderaan Human <chr [5]> <chr [1]> <chr [0]>
6 Owen Lars 178 120 brown, grey light blue 52.0 male Tatooine Human <chr [3]> <chr [0]> <chr [0]>
7 Beru Whitesun lars 165 75 brown light blue 47.0 female Tatooine Human <chr [3]> <chr [0]> <chr [0]>
8 R5-D4 97 32 <NA> white, red red NA <NA> Tatooine Droid <chr [1]> <chr [0]> <chr [0]>
9 Biggs Darklighter 183 84 black light brown 24.0 male Tatooine Human <chr [1]> <chr [0]> <chr [1]>
10 Obi-Wan Kenobi 182 77 auburn, white fair blue-gray 57.0 male Stewjon Human <chr [6]> <chr [1]> <chr [5]>

现在说我想选择仅是整数的列。这很好用:
library(dplyr)

starwars %>%
select_if(is.numeric)

但是,如果我想基于多个条件进行选择,该怎么办。例如,也许我想要数字和字符列:
starwars %>%
select_if(c(is.numeric, is.character))

或者也许我想要所有数字AND name列:
starwars %>%
select_if(name, is.character)

上面的两个示例都不起作用,因此我想知道如何完成在此概述的内容。

最佳答案

使用~函数时,select_if代表匿名函数的优美的tidyverse语法可能会有所帮助:

require(tidyverse)

# numeric and character columns
starwars %>% select_if(~ is.numeric(.) | is.character(.))

# all numeric AND the name column
starwars %>% select(name, where(is.numeric))
谓词功能,例如出于某些原因,建议将 is.numeric内的 select包裹在 where()中。

关于r - 根据多个属性条件选择列,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/44575252/

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