Incorporating single functions from other packages: rules and regulations?
On 13-01-13 3:44 PM, Tim Triche, Jr. wrote:
a n00b question: if I call importFrom(IRanges, ranges) in my NAMESPACE file, that works great. but if I call R> importFrom(IRanges, ranges) ## Error: could not find function "importFrom" well, that doesn't work great.
The NAMESPACE file is parsed as R code, but you should think of it as a bunch of declarations, not as something executable. There's no importFrom() function. If you want to do something similar at run-time, you could use ranges <- IRanges::ranges This creates a copy of the function you want in the current environment. The closest thing I can find in base is
base:::importIntoEnv which helpfully informs me that it is one of several Internal namespace support functions. Not intended to be called directly. Where's the best place to learn about how namespaces and import/export facilities (particularly in R-3.0) are implemented?
Probably the source code. Duncan Murdoch