R devel - Jul 2007 - reinforce library to re-load

Hi,

I am wondering if there is a parameter in library() so that it can
reinforce package to be reloaded. It helps when you test your modified
package by yourself. Otherwise, my way is to re-start Rgui.

(by reading ?library, I understand this option is not implemented)
"...Both functions check and update the list of currently loaded
packages and do not reload a package which is already loaded.
(Furthermore, if the package has a name space and a name space of that
name is already loaded, they work from the existing names space rather
than reloading from the file system.)"

Thanks.

-- 
Weiwei Shi, Ph.D
Research Scientist
GeneGO, Inc.

"Did you always know?"
"No, I did not. But I believed..."
---Matrix III

I think you want to use detach() 
> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Weiwei Shi
> Sent: Tuesday, July 03, 2007 3:27 PM
> To: r-help at stat.math.ethz.ch
> Cc: R-devel at stat.math.ethz.ch
> Subject: [R] reinforce library to re-load
> 
> Hi,
> 
> I am wondering if there is a parameter in library() so that 
> it can reinforce package to be reloaded. It helps when you 
> test your modified package by yourself. Otherwise, my way is 
> to re-start Rgui.
> 
> (by reading ?library, I understand this option is not 
> implemented) "...Both functions check and update the list of 
> currently loaded packages and do not reload a package which 
> is already loaded.
> (Furthermore, if the package has a name space and a name 
> space of that name is already loaded, they work from the 
> existing names space rather than reloading from the file system.)"
> 
> Thanks.
> 
> --
> Weiwei Shi, Ph.D
> Research Scientist
> GeneGO, Inc.
> 
> "Did you always know?"
> "No, I did not. But I believed..."
> ---Matrix III
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide 
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

Please don't post to multiple lists: I am replying only to R-devel.

You should detach your package, and if it has a namespace unload it, 
before attempting to reload it.  Something like

detach("package:foo")
library(foo)

or

unloadNamespace("foo")  # this also detaches the package
library(foo)

If the package has a DLL, this will in general not reload that.  Now in 
quite a few cases you cannot successfully unload a DLL, but 
library.dynam.unload is provided if you want to do this (including in your 
package's .Last.lib or .onUnload hooks).

On Tue, 3 Jul 2007, Weiwei Shi wrote:
> Hi,
>
> I am wondering if there is a parameter in library() so that it can
> reinforce package to be reloaded. It helps when you test your modified
> package by yourself. Otherwise, my way is to re-start Rgui.
>
> (by reading ?library, I understand this option is not implemented)
> "...Both functions check and update the list of currently loaded
> packages and do not reload a package which is already loaded.
> (Furthermore, if the package has a name space and a name space of that
> name is already loaded, they work from the existing names space rather
> than reloading from the file system.)"
>
> Thanks.
>
>
-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595