Thanks for the great insight. I love that there's always something else to learn in R.
â¢â¢â¢â¢â¢ Brian Lee Yung Rowe Founder, Zato Novo Professor, M.S. Data Analytics, CUNY On Jun 16, 2014, at 3:34 AM, Martin Maechler <maech...@stat.math.ethz.ch> wrote: >>>>>> Adrian DuÈa <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 > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel [[alternative HTML version deleted]]
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