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
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