Regarding, this news item for r-devel: ‘for()’ loops are generalized to iterate over any object with ‘[[’ and ‘length()’ methods. Thanks to Hervé Pagès for the idea and the patch.
Below dd is an object for which [[ and length work but the result is still numeric rather than Date class in "R Under development (unstable) (2016-03-15 r70334)" as observed in the comments to: http://stackoverflow.com/questions/36074344/why-does-for-convert-date-to-numeric#comment59794873_36074344 Expanding on that: dd <- Sys.Date() + 0:1 dd[[1]] # [[ works ## [1] "2016-03-18" length(dd) # length works ## [1] 2 for(d in dd) str(d) # gives numeric rather than Date class ## num 16878 ## num 16879 -- Statistics & Software Consulting GKX Group, GKX Associates Inc. tel: 1-877-GKX-GROUP email: ggrothendieck at gmail.com ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
