Clear R environment of all objetcs & packages

Question

I tried this command

remove(list = ls())

I expect to clear all R environment (Objects, packages)

Answer 1

The simplest and, more importantly, the only reliable way of doing this is to restart R. That takes care of everything.

Just make sure you’re not accidentally saving the current R image when quitting R.

In RStudio, you need to set the option “Save workspace to .RData file on exit” to “Never”, and disable restoring upon restart — this is strongly recommended!

After that, make sure that any previously existing .RData files in your project’s folder are deleted (heads up: .RData is an invisible file so you won’t normally see it in a file browser; you can delete it via the command line).

To restart R from within RStudio, you can use “Session” › “Restart R” or Cmd+Shift+F10.

Answer 2

The answer was already out there :-) https://stackoverflow.com/a/7506112/7902133

According to this answer, the following code should work

lapply(paste("package:", names(sessionInfo()$otherPkgs), sep=""), 
       detach, 
       character.only = TRUE, 
       unload = TRUE)

You may also want to check the first answer for a full description.