[R] using self-written functions

From: R. Leenders <suffenaam_at_yahoo.com>
Date: Thu, 28 Jun 2007 17:29:14 +0800 (CST)

Hi, I am pretty new to R, so I apologize for the obvious question. I
have worked with R for a few months now and in the process have written several functions that I frequently use in various data analysis projects. I tend to give each project a directory of its own and set the working directory to that.
Since there are several tasks that
need to be accomplished in many of my projects, I frequently want to use functions I have written previously. My question is, how do I get access to them? The way I do it now is copy the relevant code to the script file of the project I am working on at the time and then run it so as to make the functions available. But that seems to be unnecessarily cumbersome. I used to work a lot with gauss, which had the opportunity of putting one's own functions is one directory and gauss would then have that directory in its search path always. 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?

thanks, James        

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