S4 union classes
To create a class that accepts different class objects:
setClassUnion("AorB", c("classA", "classB"))
Saving data files in R packages
They need to be compressed to avoid warnings when running R CMD check
save(a,b,c,file="savefile.rda",compress='xz')
Make R package zip (for Windows) on Linux
make destination folder eg. testand write to test
mkdir test
R CMD INSTALL -l test pkgname
cd test
zip -r pkgname pkgname
R package documentation writing
If you are generating Sweave files from Lyx (Rnw), add
%\VignetteIndexEntry{Your-Title}
to the top of your Rnw file
