R:在自写包中使用magrittr管道运算符 [英] R: use magrittr pipe operator in self written package

问题描述

我想将magrittr包中引入的管道运算符%>%用于我自己编写的用于链接dplyr数据转换的包中. magrittr在DESCRIPTION文件中被列为Import.加载我自己的程序包并测试使用管道运算符的功能后，我收到以下错误消息:

I would like to use the pipe-operator %>% introduced in the magrittr package in a package I wrote myself to chain dplyr data transformations. magrittr is listed as Import in the DESCRIPTION file. After loading my own package and testing the function which uses the pipe-operator I get the following error message:

函数名错误(参数，:找不到函数％>％"

Error in functionname(parameter, : could not find function "%>%"

在函数源代码中将%>%更改为magrittr::%>%也无济于事，因为该软件包无法再构建.

Changing %>% to magrittr::%>% in the function source code does not help either because the package cannot be built anymore.

推荐答案

如果您在Depends中列出了magrittr，它应该可以正常工作.但是，这不建议.相反，您将magrittr保留在Imports中，并将以下行添加到NAMESPACE:

It should have worked correctly if you had magrittr listed in Depends. However, this is not advised. Instead, you leave magrittr in Imports and add the following line to NAMESPACE:

importFrom(magrittr,"%>%")

我建议阅读编写R扩展 .您的问题已在1.1.3和1.5.1段中涵盖.

I suggest reading Writing R extensions. Your question is covered in paragraphs 1.1.3 and 1.5.1.

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