Hi Juliane, Try TripsData[, 2:3] instead of TripsData[ 2:3 ] in the aggregate call.
HTH, Jorge On Thu, Sep 24, 2009 at 6:52 AM, Juliane Struve <> wrote: > Dear list, > > would anybody be able to tell me why the statement > > Tripstatistics=aggregate(TripsData[2:3],by=list(Trip=Tripmatch),FUN="mean") > > seems to work well with TripsData 1 but not with TripsData 2 ? > > With TripsData 2 it yields > > Error in FUN(X[[1L]], ...) : arguments must have same length > > I can't see a difference in the two data sets. Could someone shed light on > the error message ? Maybe that would help me figure out where the problem > is. > > Thanks very much for any help. > > Juliane > > PS: The examples below contain the first 5 rows of my two datafiles. > > > TripsData 1 > > Trip Distance TimeDiff Tripmatch > 7329 35,36 172.7453 0.0041 35,36 > 7371 36,35 172.7453 0.0004 35,36 > 7372 35,36 172.7453 0.0000 35,36 > 7373 36,35 172.7453 0.0004 35,36 > 7374 35,36 172.7453 0.0001 35,36 > > > TripsData 2 > > Trip Distance TimeDiff Tripmatch > 1617 19,20 1087.365 0.0441 19,20 > 1899 20,19 1087.365 0.0207 19,20 > 1915 19,20 1087.365 0.0361 19,20 > 3285 20,19 1087.365 0.0356 19,20 > 3826 19,20 1087.365 0.0697 19,20 > > > > > ______________________________________________ > 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. > [[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.
