[R] .Rprofile, .First, and .RData
maechler at stat.math.ethz.ch
Thu Feb 6 09:34:02 CET 2003
>>>>> "David" == David Richmond <daver969 at yahoo.com>
>>>>> on Wed, 5 Feb 2003 22:45:04 -0800 writes:
David> On Wednesday, February 5, 2003, at 09:30 PM, Henrik Bengtsson wrote:
>> What do you have in .First() that you can not have directly in the
>> .Rprofile script? For example:
David> Nothing that I can think of, but it's the principle
David> of the thing. If i did have a reason to change
David> .First, how would I do it ? More generally, suppose I
David> want to ensure a variable is set to a certain value
David> in .Rprofile, how can I be sure that .RData won't
David> overwrite it? It just seems like loading .RData after
David> .Rprofile makes it difficult to change things easily.
Setting global variables and relying on their values is always `un-clean'.
In your case, I would set options(): They can't ever be overridden by
any .RData -- e.g.,
options(myABC = 1:3, myFile = "/abc/def")
and then use getOption("myABC")
instead of a global variable named `ABC'.
BTW: I advocate not working with .RData at all.
I work with *.R scripts (using ESS) and when needed, explicit
save(.) and load(.) for a given list of objects and with
filenames such as "foobar.rda" instead of ".RData".
Martin Maechler <maechler at stat.math.ethz.ch> http://stat.ethz.ch/~maechler/
Seminar fuer Statistik, ETH-Zentrum LEO C16 Leonhardstr. 27
ETH (Federal Inst. Technology) 8092 Zurich SWITZERLAND
phone: x-41-1-632-3408 fax: ...-1228 <><
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