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.
The infix operator %>% is not part of base R, but is in fact defined by the package magrittr (CRAN) and is heavily used by dplyr (CRAN). It works like a pipe, hence the reference to Magritte’s famous painting The Treachery of Images. What the function does is to pass the left hand side of … Read more
%…% operators %>% has no builtin meaning but the user (or a package) is free to define operators of the form %whatever% in any way they like. For example, this function will return a string consisting of its left argument followed by a comma and space and then it’s right argument. “%,%” <- function(x, y) … Read more
Here is a quick example that takes advantage of the . and ifelse: X<-1 Y<-T X %>% add(1) %>% { ifelse(Y ,add(.,1), . ) } In the ifelse, if Y is TRUE if will add 1, otherwise it will just return the last value of X. The . is a stand-in which tells the function … Read more
The problem isn’t map, but rather how the %>% pipe deals with the .. Consider the following examples (remember that / is a two argument function in R): Simple piping: 1 %>% `/`(2) Is equivalent to `/`(1, 2) or 1 / 2 and gives 0.5. It is also equivalent to 1 %>% `/`(., 2). Simple … Read more