管道操作符“%>%"的使用在 R 中使用 :: [英] use of pipe operator "%>%" using :: in R

问题描述

我正在构建一个 R 包并且我正在大量使用管道运算符 %>%.我想知道如何使用 :: 运算符从 purrr 包中调用它.我试过 purrr::%>% 但出现错误.

I am building an R package and I am using intensively the pipe operator %>%. I am wandering how to call it from purrr package using :: operator. I have tried purrr::%>% but get an error.

我感谢任何有关此的指南.

I appreciate any guide on this.

P.D:我应该从 magrittr 而不是 purrr 呼叫管道操作员吗?

P.D: should I call the pipe operator from magrittr rather than purrr?

推荐答案

如果您希望您的用户能够访问它，最好的方法是从 magrittr 导入它并重新导出它.

Your best approach is to import it from magrittr and re-export it if you want your users to be able to access it.

仅在您的包内部使用它，这可能有效:

Using it internally to your package only, this may work:

`%>%` <- purrr::`%>%`

检查:

iris %>% summary
  Sepal.Length    Sepal.Width     Petal.Length    Petal.Width   
 Min.   :4.300   Min.   :2.000   Min.   :1.000   Min.   :0.100  
 1st Qu.:5.100   1st Qu.:2.800   1st Qu.:1.600   1st Qu.:0.300  
 Median :5.800   Median :3.000   Median :4.350   Median :1.300  
 Mean   :5.843   Mean   :3.057   Mean   :3.758   Mean   :1.199  
 3rd Qu.:6.400   3rd Qu.:3.300   3rd Qu.:5.100   3rd Qu.:1.800  
 Max.   :7.900   Max.   :4.400   Max.   :6.900   Max.   :2.500  
       Species  
 setosa    :50  
 versicolor:50  
 virginica :50  

您不能直接在表达式中使用 purrr::`%>%`，因为运算符需要在语法上公开为二元运算符，即 %>%(无资质).

You cannot use purrr::`%>%` directly in expressions as the operator needs to be syntactically exposed as a binary operator, i.e. as %>% (without qualification).

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