[R] R package: Where to put code to Run Once Only?

[Ken-JP]

Thanks to pointers from Uwe, I first tried zzz.R and .First.lib(), which
does what I needed (initialize once).

Then under Martin's suggestion, I converted the package to use NAMESPACE and
.onLoad().

Using NAMESPACE, I was able to hide my globals behind a "." (eg .myGlobal
<<- 72) and use exportPattern("^[^\\.]*") to prevent users from seeing my
globals, yet I was able to access their values inside my package.

After a couple of hours of cleaning up, I was able to tighten my package to
build cleanly (no warnings) for the first time in a long while with R CMD
Check - on 3 different machines.  I am happy to get no warnings on 2.8.1
(Ubuntu amd64) and 2.9 alpha (XP Pro 32 and Vista 32), where I learned
something new about RDoc Version 2 (the difference between \description and
\describe), changes going from 2.8.1 to 2.9.

So with a little persistence and a lot of assitance from R-help I was able
to tighten up the code and to build cleanly.  Thank you.


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