[R] R CMD REMOVE etc. query

Gabor Grothendieck ggrothendieck at gmail.com
Fri Apr 16 12:54:46 CEST 2010

Assuming its the last package that you loaded detach() without
arguments will detach it.

On Thu, Apr 15, 2010 at 1:45 PM, Prof. John C Nash <nashjc at uottawa.ca> wrote:
> Brian Ripley pointed out that the library() documentation (third screen,
> however) says that library() and require() check current environment to see
> if a package is loaded and only load if it is not present. I may have
> oversimplified, and clarifications welcome. But this is clearly NOT what I
> want, since I need the latest package version to test.
> Tentative solution is outlined, but suggestions welcome on string cleanup
> issue mentioned.
> As I need to remove a package and its dependencies before reloading, I can
> use tool::pkgDepends to get a list.
> I found that a character string extracted from the dependency vector gives
> 'invalid name' error in detach(). That is, I can create a variable
> myfoo="package:foo", but detach(myfoo) gives the error while typing
> detach("package:foo") works fine.  Workaround seems to be
>   slist<-search()
>   idx<-which(slist==myfoo)
>   detach(idx)
> There's still a nuisance issue of how to strip off  the (>=0.7.11)
> descriptors in the dependency list. strsplit() will work, but I seem to need
> to loop through the list to use it when only some of the packages are
> restricted by qualifiers.
> If someone has already dealt with this type of issue, I'd be happy to know.
> For example, if there is a forceLoad() somewhere, it would save the effort
> above and could be useful for developers to ensure they are using the right
> version of a package.
> JN
>> From: Prof. John C Nash <nashjc_at_uottawa.ca>
>> Date: Thu, 15 Apr 2010 10:17:46 -0400
>> I've been working on a fairly complex package that is a wrapper for
>> several optimization routines. In this work, I've attempted to do the
>> following:
>>    * edit the package code foo.R
>>    * in a root terminal at the right directory location
>> However, I don't get the right code. In fact, if I just do the remove,
>>     library(foo)
>> does not throw an error. If I stop my R session and restart it, I do.
>> Is this expected behaviour?
>> For information, I run scripted tests that start with
>>    rm(list=ls())
>>    library(foo)
>> to ensure I'm getting "new" code each time.
>> If desired I can provide a minimal package to show this, but I expect that
>> it is a known issue for which I've missed the documentation. Perhaps there
>> is a command to reset the session. I did a brief search, but appropriate
>> keywords pick up a lot of irrelevant material.
>> JN
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