Dear Uwe, > > On 07.02.2013 15:41, Dr. Peter Ruckdeschel wrote: >> Hi, >> >> to speed up computations in our RobASt family of packages, we use >> interpolation on a grid of precomputed values which we save together >> with the interpolating functions (results of splinefun essentially) >> in sysdata.rda in the R folder of our pkg. >> >> After adding grids for some more models, this file has grown >> considerably, even after application of tools::resaveRdaFiles. >> At the moment we are at about 2MB (compressed) and 8.8 MB >> (uncompressed) and hence R CMD check --as-cran issues a NOTE. >> >> We want to comply with cran policies, >> http://cran.r-project.org/web/packages/policies.html >> in particular with >>> Where a large amount of data is required (even after compression), >>> consideration should be given to a separate data-only package which >>> can be updated only rarely (since older versions of packages are >>> archived in perpetuity). >> >> Q1: Are packages only consisting of a sysdata.rda file thinkable for >> submission on CRAN ? Are such pkgs the way to go for w.r.t. to the >> cited policy? > > Yes, given this package needs less updates than the main package, one > should consider such a data only package that needs rare updates and > does not flood the space with archived versions. > Fine. We are going to do this then (albeit possibly not yet with the next release).
BTW: Of course the code to generate the grids would be accessible in the main package to be compliant with open source ideas. >> If this is the case, how would one document such a package, in >> particular >> if we do not export any objects in the NAMESPACE file? >> In addition, with a sysdata.rda-only pkg, R CMD check issues a warning >> "Found directory 'R' with no source files" Of course a workaround is >> adding a comment-only file comment.R to the R folder. > > If the checks will be changed not to warn in such a case, this can > only happen for R >= 3.0.0, so your workaround to tell the checks you > really intended such a package with R folder not containing any code > sounds plausible for now. > > >> Q2: Is there a lazy load / lazy data mechanism available for >> sysdata.rda ? If so how would one enforce it? > > It is lazy loaded. From WRE: > "if the ‘R’ subdirectory contains a file ‘sysdata.rda’ [...] this will > be lazy-loaded into the namespace/package environment" > Ah must have missed this. Many thanks for your comments. Best, Peter > > Best, > Uwe > > > >> Any suggestions appreciated, >> >> Best, Peter >> -- Dr. habil. Peter Ruckdeschel, Abteilung Finanzmathematik, F3.17 Fraunhofer ITWM, Fraunhofer Platz 1, 67663 Kaiserslautern Telefon: +49 631/31600-4699 Fax : +49 631/31600-5699 E-Mail : peter.ruckdesc...@itwm.fraunhofer.de http://www.itwm.fraunhofer.de/abteilungen/finanzmathematik/mitarbeiterinnen/mitarbeiter/dr-peter-ruckdeschel.html ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
