select_ in dplyr返回异常

Question

我面临以下例外：

library(tidyverse)
library(dplyr)
library(rlang)

data(mtcars)

select_expr = "mpg , cyl"

mtcars %>% select_(select_expr)

Error in parse(text = x): <text>:1:5: unexpected ','
1: mpg ,
        ^

我做错了什么？

您的建议将不胜感激。

Answer 1

你犯了一个我经常犯的错误，只需在字符串中添加2个提取重音

library(tidyverse)
library(dplyr)
library(rlang)

data(mtcars)

select_expr = c("mpg" , "cyl")

mtcars %>% select(select_expr)