> On 11/04/2012 20:36, Matthew Dowle wrote: >> In DESCRIPTION if I set LazyLoad to 'yes' will data.table (for example) >> then be byte compiled for users who install the binary package from CRAN >> on Windows? > > No. LazyLoad is distinct from byte compilation. All installed packages > use lazy loading these days (for simplicity: a very few do not benefit > from it as they use all their objects at startup). > >> This question is based on reading section 1.2 of this document : >> http://www.divms.uiowa.edu/~luke/R/compiler/compiler.pdf >> I've searched r-devel and Stack Overflow history and have found >> questions and answers relating to R CMD INSTALL and install.packages() >> from source, but no answer (as yet) about why binary packages for >> Windows appear not to be byte compiled. >> If so, is there any reason why all packages should not set LazyLoad to >> 'yes'. And if not, could LazyLoad be 'yes' by default? > > I wonder why you are not reading R's own documentation. 'Writing R > Extensions' says > > 'The `LazyData' logical field controls whether the R datasets use > lazy-loading. A `LazyLoad' field was used in versions prior to 2.14.0, > but now is ignored. > > The `ByteCompile' logical field controls if the package code is > byte-compiled on installation: the default is currently not to, so this > may be useful for a package known to benefit particularly from > byte-compilation (which can take quite a long time and increases the > installed size of the package).' >
Oops, somehow missed that. Thank you! > Note that the majority of CRAN packages benefit very little from > byte-compilation because almost all the time of their computations is > spent in compiled code. And the increased size also may matter when the > code is loaded into R. > >> Thanks, >> Matthew >> >> ______________________________________________ >> R-devel@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-devel > > > -- > Brian D. Ripley, rip...@stats.ox.ac.uk > Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ > University of Oxford, Tel: +44 1865 272861 (self) > 1 South Parks Road, +44 1865 272866 (PA) > Oxford OX1 3TG, UK Fax: +44 1865 272595 > ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
