load data for mypkg-Ex.R
On Fri, 27 Feb 2004, Jason Sinnwell wrote:
Using R 1.7.1 in Solaris I'm developing a package for both Splus and R, and I'm trying to use all the same files for R and Splus, both function files and help files. I have two questions. 1) The file made by R CMD check to run .Rd-examples posts examples from files in alphabetical order. Is it okay/recommended/common-practice to set up all the example data in the first two (alphabetically-sorted) examples and assume that data exists for the rest of the examples?
No. In fact, it is specifically disallowed.
2) Since data() is not understood by Splus, I don't want to put a
> data(example.data)
in the sgml file because then the Splus example would not run as data() doesn't exist there. Is there a spot I can make sure this data is loaded when running the examples, but not to load the data every time you load the library, as it would take up unnecessary space. It is a ~~220 x 25 data.frame, is that enough size to worry about this?
I wouldn't think it was big enough to worry seriously about
I'm considering using the NAMESPACE or .First.lib() within zzz.R but that would load the data every time the library is loaded. Also considering something like:
if (<check for R using is.R()>) data(example.data) <run example>
In the example but that would create confusion for users.
You could define a function if (is.R()) setupData<-data else setupData<-function(...) invisible(NULL) and then use setupData() instead of data(), or you could look at what MASS does using delay() to autoload data as needed. -thomas