[R] How to unload a package or "undo" library("package")

[Aleš Žiberna]

Hello!

I would like to unload a package form a current R session. I tried
datach(package:packagename), however it does not work. The reason I want to
unload it is that I want to correct some files in the package and reinstall
it without closing an R session.

Best,
Ales Ziberna

PS: I am using R 2.1.1 on Windows XP