All packages should be unloaded except base, with unloadNamespace.
Normally you have to do this in the correct order to avoid errors. (You can't unload a package imported by another loaded package.) But a horrible, ugly way of doing it is to loop over all the loaded packages until only base is left, and ignore errors:
pkgs <- setdiff(loadedNamespaces(), "base")
while (length(pkgs) > 0) {
for (pkg in pkgs) {
tryCatch(unloadNamespace(pkg), error = function (e) invisible())
}
pkgs <- setdiff(loadedNamespaces(), "base")
}
This needs a check to avoid infinite loops, because some packages just won't unload properly.
All packages should be unloaded except base, with
unloadNamespace.Normally you have to do this in the correct order to avoid errors. (You can't unload a package imported by another loaded package.) But a horrible, ugly way of doing it is to loop over all the loaded packages until only base is left, and ignore errors:
This needs a check to avoid infinite loops, because some packages just won't unload properly.