Re: [Rd] reinforce library to re-load

From: Prof Brian Ripley <>
Date: Wed, 04 Jul 2007 06:36:53 +0100 (BST)

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



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,        
Professor of Applied Statistics,
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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