[R] Reset R's library to base packages only (remove all installed contributed packages)

[Janko Thyson]

On 14.06.2011 13:34, Uwe Ligges wrote:
>
>
> On 14.06.2011 12:04, Janko Thyson wrote:
>> Dear list,
>>
>> is there a way to comfortably "reset" R's library such that it only
>> contains only the base packages again? In other words, how can I
>> uninstall all contributed packages that I installed? Is there some sort
>> of index that's keeping track of what has been installed? If so, a
>> pointer would be great.
>>
>> AFAIU, if you don't create such an "index file" yourself and loose track
>> of what you installed, probably the best way to "reset" R is to actually
>> re-install it. That's exactly what I'm trying to avoid.
>>
>> I would like something like
>>
>> path.lib <- "path/to/R/lib"
>> pkgs.to.remove <- readLines(path.to.index.file)
>
> ip <- installed.packages()
> pkgs.to.remove <- ip[!(ip[,"Priority"] %in% c("base", "recommended")), 1]
>
> This way you select all installed packages that do not ship with R (as 
> base or recommended ones).
>
> Uwe Ligges
>
>
Great, thanks!
>
>
>
>> sapply(pkgs.to.remove, uninstall.packages, lib=path.lib)
>>
>> Best regards,
>> Janko
>>
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>