On Wed, Aug 12, 2015 at 10:55 AM, Gábor Csárdi <csardi.ga...@gmail.com> wrote: > I am not sure if this is a bug or not. > I would argue that this isn't a bug, not even in the documentation of "for" (even though it might be clearer). ?"for" says that `seq` is "[A]n expression evaluating to a vector (including a list and an expression) or to a pairlist or 'NULL'". Date objects aren't strictly vectors, so they're treated as integer/numeric.
This answer on StackOverflow said that "for" does not copy any of the iterators attributes (including class), which causes this behavior. http://stackoverflow.com/a/23278464/271616 To respond to the original question regarding why the code below, "prints the dates as a string". Quite simply, you convert seq(d1,d2, by=1) to character, so it's no longer a Date. The fact that Sys.Date() and as.character(Sys.Date()) both *print* the same thing does not mean they are the same. for ( dt in as.character(seq(d1,d2, by=1)) ) { print(dt) } Best, Josh > Gabor > > On Wed, Aug 12, 2015 at 11:51 AM, Luca Cerone <luca.cer...@gmail.com> wrote: >> Following up on this, should I report a bug? can you drive me through >> the process? >> >> Cheers, >> Luca >> >> On Thu, Aug 6, 2015 at 4:55 PM, William Dunlap <wdun...@tibco.com> wrote: >>>>> Just a quick question: what's the difference between `[.Date` and >>>>> `[[.Date`? >>>>> Is it supposed to be the method for accessing the value right? >>>> >>>>For Dates and atomic vectors in general they are the same, but ... >>> >>> Even for atomic vectors with names they are not quite the same >>> > c(One=1, Two=2)[[2]] >>> [1] 2 >>> > c(One=1, Two=2)[2] >>> Two >>> 2 >>> (and [[ will only return 1 item, unlike [). >>> >>> >>> Bill Dunlap >>> TIBCO Software >>> wdunlap tibco.com >>> >>> On Thu, Aug 6, 2015 at 5:36 AM, Gábor Csárdi <csardi.ga...@gmail.com> wrote: >>>> >>>> On Thu, Aug 6, 2015 at 6:30 AM, Luca Cerone <luca.cer...@gmail.com> wrote: >>>> [...] >>>> > Just a quick question: what's the difference between `[.Date` and >>>> > `[[.Date`? >>>> > Is it supposed to be the method for accessing the value right? >>>> >>>> For Dates and atomic vectors in general they are the same, but in >>>> general they are two different operators that behave differently on >>>> some data types. E.g. on lists [ selects a sub-list and [[ selects a >>>> single element. >>>> >>>> Gabor >>>> >>>> [...] >>>> >>>> ______________________________________________ >>>> R-devel@r-project.org mailing list >>>> https://stat.ethz.ch/mailman/listinfo/r-devel >>> >>> > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel -- Joshua Ulrich | about.me/joshuaulrich FOSS Trading | www.fosstrading.com ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
