Recommended way to call/import functions from a Suggested package
I don't see any warnings if MASS is listed in Suggests in the DESCRIPTION. Davor
On 2013-02-25, at 1:28 PM, Hadley Wickham wrote:
To summarize, it appears that the only way to call functions from a suggested package is by using either 'require' (which will dynamically attach it) or the double colon method. Is this something that should be mentioned in R-exts?
Except the double colon method doesn't work (i.e. does not pass R CMD check) unless you also import the package, which means it's no longer just a suggestion - it must always be installed. A simple test case (attached DESCRIPTION and R/test.r) yields this warning on R CMD check: * checking for unstated dependencies in R code ... WARNING '::' or ':::' import not declared from: 'MASS' See the information on DESCRIPTION files in the chapter 'Creating R packages' of the 'Writing R Extensions' manual. Hadley -- Chief Scientist, RStudio http://had.co.nz/ <test.r><DESCRIPTION>