Astute observation. And of course we should be passing integer when we use %d. It's an edge case in how we printed ITime objects in data.table:
On Tue, May 23, 2017 at 11:53 AM, Joris Meys <jorism...@gmail.com> wrote: > I initially thought this is "documented behaviour". ?sprintf says: > > Numeric variables with __exactly integer__ values will be coerced to > integer. (emphasis mine). > > Turns out this only works when the first value is numeric and not NA, as > shown by the following example: > > > sprintf("%d", as.numeric(c(NA,1))) > Error in sprintf("%d", as.numeric(c(NA, 1))) : > invalid format '%d'; use format %f, %e, %g or %a for numeric objects > > sprintf("%d", as.numeric(c(1,NA))) > [1] "1" "NA" > > So the safest thing is indeed passing the right type, but the behaviour is > indeed confusing. I checked this on both Windows and Debian, and on both > systems I get the exact same response. > > Cheers > Joris > > On Tue, May 23, 2017 at 4:53 PM, Evan Cortens <ecort...@mtroyal.ca> wrote: > >> Hi Michael, >> >> I posted something on this topic to R-devel several weeks ago, but never >> got a response. My ultimate conclusion is that sprintf() isn't super >> consistent in how it handles coercion: sometimes it'll coerce real to >> integer without complaint, other times it won't. (My particular email had >> to do with the vectors longer than 1 and their positioning vis-a-vis the >> format string.) The safest thing is just to pass the right type. In this >> case, sprintf('%d', as.integer(NA_real_)) works. >> >> Best, >> >> Evan >> >> On Fri, May 19, 2017 at 9:23 AM, Michael Chirico < >> michaelchiri...@gmail.com> >> wrote: >> >> > Consider >> > >> > #as.numeric for emphasis >> > sprintf('%d', as.numeric(1)) >> > # [1] "1" >> > >> > vs. >> > >> > sprintf('%d', NA_real_) >> > >> > > Error in sprintf("%d", NA_real_) : >> > >> > invalid format '%d'; use format %f, %e, %g or %a for numeric object >> > > >> > >> > I understand the error is correct, but if it works for other numeric >> input, >> > why doesn't R just coerce NA_real_ to NA_integer_? >> > >> > Michael Chirico >> > >> > [[alternative HTML version deleted]] >> > >> > ______________________________________________ >> > R-devel@r-project.org mailing list >> > https://stat.ethz.ch/mailman/listinfo/r-devel >> > >> >> >> >> -- >> Evan Cortens, PhD >> Institutional Analyst - Office of Institutional Analysis >> Mount Royal University >> 403-440-6529 >> >> [[alternative HTML version deleted]] >> >> ______________________________________________ >> R-devel@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-devel >> > > > > -- > Joris Meys > Statistical consultant > > Ghent University > Faculty of Bioscience Engineering > Department of Mathematical Modelling, Statistics and Bio-Informatics > > tel : +32 (0)9 264 61 79 <+32%209%20264%2061%2079> > joris.m...@ugent.be > ------------------------------- > Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php > [[alternative HTML version deleted]] ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel