You seem to have omitted a left quotation mark in (2): %H:%M:%S". Regards, Yihui -- Yihui Xie <[EMAIL PROTECTED]> Phone: +86-(0)10-82509086 Fax: +86-(0)10-82509086 Mobile: +86-15810805877 Homepage: http://www.yihui.name School of Statistics, Room 1037, Mingde Main Building, Renmin University of China, Beijing, 100872, China
On Sun, Oct 5, 2008 at 1:25 PM, Gouri Shankar Mishra <[EMAIL PROTECTED]> wrote: > Hi > > I have two columns of data with time in form of HH:MM:SS - representing > start time and end time of an activity. I am trying to calculate the time > difference (duration of the activity). > > (1) I first tried >> difftime(btime, etime, units = "mins") > This however gave me the error - Error in > as.POSIXlt.character(as.character(x)) : character string is not in a > standard unambiguous format > > (2) The above error message indicated some problem in format. So I tried >> etime1=as.date(etime, %H:%M:%S") > This gave me the Error: unexpected SPECIAL in "etime1=as.date(etime, %H:%" > > I also tried >>etime1=format(etime, %H:%M:%S") > But this gave a similar error - unexpected SPECIAL in "etime1=format(etime, > %H:%" > > Any suggestions? > > Regards > > [[alternative HTML version deleted]] > > ______________________________________________ > 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. > ______________________________________________ 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.
