
I personally place functions like this in my .First function under the .Rprofile, making them instantly accessible.  I also keep a function called my.fun() which lists a data frame containing a column of all the function names, one for arguments, and a brief description.  This also goes in .First.  Again, this makes it easy to quickly reference what you have and makes all your functions quickly accessible.
 
Tyler 
 

> Date: Sat, 9 Jul 2011 13:30:51 +0200
> From: s.chamaille@yahoo.fr
> To: r-help@r-project.org
> Subject: [R] Storing and managing custom R functions for re-use
> 
> Dear all,
> 
> sorry if this is a bit on the sidetrack for R-help.
> 
> As a regular R user I have developed quite a lot of custom R functions, 
> to the point of not always remembering what I have already programmed, 
> where the file is and so on.
> I was wondering what other people do in this regards. A basic file with 
> all your functions, or a custom R package, or directly integrated into a 
> profile file ??? I'm considering that a blog with tagged posts may be a 
> good solution (and really good ones could join R-bloggers maybe).
> 
> If someone is happy to share what (s)he considers good practice, thanks.
> 
> simon
> 
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