Hi r-help-boun...@r-project.org napsal dne 17.03.2010 14:57:32:
> Hi, > > Does anyone know how to add minutes (up to 100 min) to a 24 hour time, to > create a new 24 hour time? I can't seem to find any documentation or examples > explaining how to do this. The variables of interest are 'ARRIVE','WAIT', and > 'DEPART' in the attached partial dataframe. I want 'DEPART' to be the "sum" of > 'ARRIVE' and 'WAIT' in 24 hour format. Also, can anyone direct me to some > relevant documentation? You can make a date/time object from YEAR, WEEK, ARRIVE by mydate <- strptime(paste(....)) see ?strptime then you can add ARRIVE just by mydate+ARRIVE*60 (You did not say explicitly what values are ARRIVE so assume minutes) You shall probably also consult zoo library, especially na.locf function. Regards Petr > > Thank you, > > Mike > [příloha Dataframe.pdf odstraněna uživatelem Petr PIKAL/CTCAP] > ______________________________________________ > 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.