Dear all,
thanks you very much for replying. However, this does not seem to solve the problem. I still get the same error message when using TripsData[,2:3]. Is there anything else that could be wrong with this statement or the data ? What length is the error message referring to ? Many thanks, Juliane Dr. Juliane Struve Environmental Scientist 10, Lynwood Crescent Sunningdale SL5 0BL 01344 620811 ----- Original Message ---- From: Paul Emberson <[email protected]> To: Juliane Struve <[email protected]> Cc: [email protected] Sent: Thursday, 24 September, 2009 12:27:00 Subject: Re: [R] aggregate() - error message Hi, Are you trying to get columns 2 and 3 from TripsData in which case you need to say TripsData[,2:3] ? Paul 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 > > > > > ______________________________________________ > [email protected] 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. ______________________________________________ [email protected] 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.
