R: use magrittr pipe operator in self written package

r namespaces magrittr
alexander keth picture alexander keth · Jan 14, 2015 · Viewed 16.2k times · Source

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:

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

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

Answer

tonytonov picture tonytonov · Jan 16, 2015

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,"%>%")

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

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