>>>>> Adrian Dușa <dusa.adr...@unibuc.ro>
>>>>> on Mon, 16 Jun 2014 08:33:59 +0300 writes:
> On Mon, Jun 16, 2014 at 6:37 AM, Gabriel Becker
> <gmbec...@ucdavis.edu> wrote:
>> [...] You can. This is valid R source, so the parser
>> will understand it
>>
>> expr = parse(text= example("deMorgan", package="QCA",
>> give.lines=TRUE))
>>
>> You can then evaluate some or all of that expression
>> using either R's own eval package or, e.g. Hadley
>> Wickham's evaluate package (for your particular usecase
>> evaluate will be easier I think).
> Oh, I see...! In that case I can use it, of course. Did
> install the evaluate package, although one would expect
> some better documentation (no examples at all, especially
> at the main evaluate function).
>>> [...]
>> index.search is an unexported function, which means that
>> it is subject to change in how it behaves without notice
>> or even externally available reasons. You can get it via
>> :::, but again, it's really not the right tool here, and
>> not safe to use in general in code you expect to keep
>> working.
> Yes, I figured that much. Of course it's not meant to be
> used in any decently working code, but I learn heavily by
> simply looking at these sort of (hidden) R functions.
> Thanks again, Adrian
Apropos "not the right tool". I'm a bit astonished that nobody
mentioned the fact R already provides "the tool" to
automatically compare all example outputs with a previous
version (of the packages example outputs):
*THE* manual (every package writer should know about,
re-read/browse about once a year, and search in for such questions):
"Writing R Extensions", section Package subdirectories
----------------------------
(e.g. on the CRAN master in Vienna,
http://cran.r-project.org/doc/manuals/R-exts.html#Package-subdirectories )
says
| If directory 'tests' has a subdirectory 'Examples' containing a file
| 'PKG-Ex.Rout.save', this is compared to the output file for running the
| examples when the latter are checked.
So: After an 'R CMD check <PKG>' you only need to take and
keep the <PKG>-Ex.Rout file that is produced (in the
PKG.Rcheck/ directory), and save it into <PKG>/tests/<PKG>-Ex.Rout.save
and from then on, every time you run R CMD check <PKG> the
comparison will be made.
Martin Maechler, ETH Zurich
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