[R] R-ex directory in a R package; large software in R

[jonathan_li@agilent.com]

Hi,

To better organize a package, one sometimes wants to place some individual R
files in R-ex directory (at least this
is the way I understand the functionality of R-ex). But how does one
organize the source R package so that 
R CMD INSTALL pkg will know which R files will go into the R-ex directory?
In the implementation R CMD INSTALL pkg, all R files in the pkg/R directory
are automatically merged into a single file. 

A more general and related question is: how does one organize R files in a
package? Should they all just go into pkg/R? To create a large package, this
way of organization is not very desirable. Most of R packages seem to be
relatively small so far. But I am hoping that some larger software can be
built around R. Can people comment on this?

Thanks!

Regards,
Jonathan
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