[R] using self-written functions

[Mike Meredith]

I use something like Gavin's solution for functions which are not used too
often. The problem with using 'source' is that the user environment gets
cluttered.

I 'save' the most useful functions to a single file ("MMmisc.Rda"), put it
in the HOMEPATH directory (use Sys.getenv("HOMEPATH") to find where that
is), then I put the line

attach(what=paste(Sys.getenv("HOMEPATH"), "MMmisc.Rda", sep="/"))

in Rprofile.site in C:\Program Files\R\R-2.5.0\etc folder.

Works for me! You don't have the luxury of help files, etc, but it's easy to
update.

HTH -- Mike.


Gavin Simpson wrote:
> 
> On Thu, 2007-06-28 at 17:29 +0800, R. Leenders wrote:
>> ... How can
>> I access my own functions in R without having to copy-paste them
>> everytime and run them manually so I can call them later? Do I need to
>> learn how to write a package and attach the package to make the
>> functions available at all times? Is there another way?
> 
> Building a package is one way, and not that difficult once you've read
> the Writing R Extensions manual.
> 
> An alternative is to have a directory where you keep R function scripts.
> Put your functions in here in text files with say a .R extension. Then
> in R you can source one or more of these R scripts as required, using
> the source() function.
> 
> Say you have a directory, myScripts at the base of file system
> (/home/user say on Linux or C:\ on Windows). in this directory there is
> a file called my_r_function.R. To use this script/function in an R
> session, you would issue:
> 
> ## replace /home/user/ with what ever is the correct path for your
> ## system
> source("/home/user/myScripts/my_r_function.R")
> 
> Which would make available to your current session any functions defined
> in my_r_function.R.
> 
> Read ?source for more information.
> 
> HTH
> 
> G
> 
>> 
>> thanks, James
>> 
>> 
>> 
>> 
>>        
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