The inconsistency arose in order to satisfy backward compatibility while giving chron a direct way to use % codes.
chron used its own format specification so it would have been difficult to add % codes there; however, as.chron, at the time, did not support a format specification at all so it was still possible to add a format specifier using % codes without disrupting existing code. On Thu, Aug 27, 2009 at 2:21 PM, Stephen Tucker<brown_...@yahoo.com> wrote: > Ah, thanks always - > I originally thought as.chron() was required to have all fields (m/d/y > hh:mm:ss) as for chron() but I see that the former passes its 'format' > argument to as.POSIXct() > Good deal! > Stephen > > > > ----- Original Message ---- > From: Gabor Grothendieck <ggrothendi...@gmail.com> > To: Stephen Tucker <brown_...@yahoo.com> > Cc: Tony Breyal <tony.bre...@googlemail.com>; r-help@r-project.org > Sent: Thursday, August 27, 2009 7:27:26 AM > Subject: Re: [R] Merge data frames but with a twist. > > On Thu, Aug 27, 2009 at 9:55 AM, Stephen Tucker<brown_...@yahoo.com> wrote: >> You may want to use the reshape package for this task: >> >>> library(reshape) >>> recast(DF3,Show ~ Datetime, id.var=names(DF3),value="Measure") >> Show 08/26/2009 11:30 AM 08/26/2009 9:30 AM >> 1 Firefly 3 1 >> 2 Red Dwarf 4 2 >> >> If you want to plot time series, you can do something like the following >> >>> mydf <- .Last.value ## save the output from above to mydf >>> library(zoo) >>> zobj <- zoo(`mode<-`(t(mydf),"numeric"), >>> as.chron(strptime(names(mydf)[-1],"%m/%d/%Y %I:%M %p"))) >>> plot(zobj) >> >> (zobj is a time series object of the zoo class) > > Note that as.chron can take % codes directly so the as.chron portion > can be shortened to: > > as.chron(names(mydf)[-1],"%m/%d/%Y %I:%M %p") > > > > > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
