Thank you so much! Perhaps it could be mentioned in the official documentation on writing R extensions - even if - if I can read English - the default is to avoid "lazyData" loading - and "laxyData" loading is in some opposition to loading using data() - whereas - if we use RStudio, and make an R documentation file for data, we have it ending with: \examples{ data(ddd) ## maybe str(ddd) ; plot(ddd) ... } \keyword{datasets}
At the same time as "lazyData" is used default in DESCRIPTION ? 1.1.6 Data in packages The data subdirectory is for data files, either to be made available via lazy-loading or for loading using data(). (The choice is made by the 'LazyData' field in the DESCRIPTION file: the default is not to do so.) It should not be used for other data files needed by the package, and the convention has grown up to use directory inst/extdata for such files. All best wishes Troels -----Oprindelig meddelelse----- Fra: peter dalgaard <pda...@gmail.com> Sendt: 13. januar 2019 22:00 Til: Troels Ring <tr...@gvdnet.dk> Cc: Michael Dewey <li...@dewey.myzen.co.uk>; package-develop <r-package-devel@r-project.org> Emne: Re: [R-pkg-devel] RData files with identical objects in package I think it is illegal if you use the lazyload database, because that is indexed by name and contains every object that would be created by data(). This creates an obvious issue if two objects share a name. Once you use the lazyload database, loading the package creates an environment which is initially full of promises, one for each object. Evaluating one of these makes the actual object appear in the environment. Using data() causes the corresponding promise(s) to be created in the global environment. IIRC, there is a registry that says which objects are created by which arguments to data(), but as they are still taken from the lazydata database, the last one created with a given name still wins. -ps > On 13 Jan 2019, at 14:13 , Troels Ring <tr...@gvdnet.dk> wrote: > > Thanks a lot - I'm sure you are right that I could just use different > names but I cannot understand why it could cause problem to have two > different well formated .RData files in the /data directory both with > an "x" - is that really illegal? I cannot see it stated in the > official munual - but it is long (wrting r extensions) -BW Troels > > -----Oprindelig meddelelse----- > Fra: Michael Dewey <li...@dewey.myzen.co.uk> > Sendt: 13. januar 2019 12:56 > Til: Troels Ring <tr...@gvdnet.dk>; package-develop > <r-package-devel@r-project.org> > Emne: Re: [R-pkg-devel] RData files with identical objects in package > > Dear Troels > > Perhaps I misunderstand what you are trying to do but would it be > possible to put each x and y into a list or a dataframe with different > names and then modify your usgae to pull them from there? Then there > would be no danger of users getting the wrong x and y > > Michael > > On 13/01/2019 08:38, Troels Ring wrote: >> Dear friends - I have a package under creation making heavy >> calculations on chemical/clinical data and I plan to include as >> "examples" the use of some literature data used in my papers. To >> illustrate what then occurs, I made two RData files consisting only >> of x and y with different values for x and y like >> >> X <- 100 >> >> Y <- 1000 >> >> save(x,y,file="first.RData") >> >> and then a new x and y in "second" with x <- 45 and y <- 32 >> >> When I put these in a "data" directory of a new package without >> further ado in RStudio >> >> Ctrl-shift-L >> >> Ctrl-shift-B >> >> >> >> .there is a warning >> >> * installing *source* package 'try' ... >> >> ** R >> >> ** data >> >> *** moving datasets to lazyload DB >> >> warning: objects 'x', 'y' are created by more than one data call >> >> ** byte-compile and prepare package for lazy loading >> >> ** help >> >> converting help for package 'try' >> >> *** installing help indices >> >> finding HTML links ... hello html >> >> done >> >> >> >> Now, when I clear the workspace: >> >>> ls() >> character(0) >>> devtools::load_all(".") >> Loading try >> >> Restarting R session... >> >>> library(try) >>> ls() >> character(0) >>> x #-- so even if workspace Is empty x is still kept >> [1] 45 >>> data(first) # and "first" is not seen x >> [1] 45 >> >> >> >> x is still present - and y >> >> >> >> I have been reading and searching in "Writing R extensions" but so >> far didn't find the clue. >> >> Seemingly it is the file with the last name that is assessed - when I >> rename first.RData to "xfile.RData" we get 100 and 1000. >> >> Now and then when running ctrl-shift-L and - B we see >> >> >> >> Attaches package: 'try' >> >> The following objects are masked _by_ '.GlobalEnv': >> x, y >> >> >> >> Sorry for these problems - >> >> BW >> Troels >> >> >> [[alternative HTML version deleted]] >> >> ______________________________________________ >> R-package-devel@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-package-devel >> > > -- > Michael > http://www.dewey.myzen.co.uk/home.html > > ______________________________________________ > R-package-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-package-devel -- Peter Dalgaard, Professor, Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Office: A 4.23 Email: pd....@cbs.dk Priv: pda...@gmail.com ______________________________________________ R-package-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-package-devel