Hello, sorry for this confusion but I don't know a better way to explain... I have no problems to read in the files and to process them. I end up with a list of results like this:
> ret $A02.csv [1] NA $B02.csv [1] 89.130435 8.695652 2.173913 0.000000 0.000000 0.000000 9.892473 $C02.csv [1] 86.842105 10.526316 2.631579 0.000000 0.000000 0.000000 10.026385 $D02.csv [1] 85.000000 10.000000 5.000000 0.000000 0.000000 0.000000 4.474273 $E02.csv [1] 70.786517 13.483146 7.865169 5.617978 2.247191 0.000000 12.125341 $F02.csv [1] 70.83333 14.16667 10.00000 2.50000 2.50000 0.00000 17.26619 $G02.csv [1] 64.772727 13.636364 7.954545 11.363636 2.272727 0.000000 12.735166 $H02.csv [1] NA $A03.csv [1] NA and I have a matrix with categories like this: > classmatrix 1 2 A NA NA B NA "cat1" C NA "cat1" D NA "cat1" E NA "cat2" F NA "cat2" G NA "cat2" H NA NA Now, I'm looking for a way to calculate the mean element wise for all results coming from the same category: in this case the mean of the elements: $B02.csv $C02.csv $D02.csv (belonging to "cat1") I just don't know, how to combine the result list with the categories... Does it become clearer? Probably, I try to provide a simple example but this will take some time to prepare... Thanks anyway! Antje 8rino-Luca Pantani schrieb: > I'm unclear to what it is your problem. > Import files into data frame? > Combine them in one dataframe? > Some (written) examples of the files would help people to help you out. > > An example on how to get help better and faster > >>>>>>>>>>>> > I have several csv files in the following form > V1 V2 > 1 4 > 0.3 56 > ................ > V1 V2 > 2.5 25 > 4.5 45 > ..................... > > I would like to import them in only one dataframe, and then recode a > column in order to get > V1 V2 V3 > 1 4 file1 > 0.3 56 file1 > 2.5 25 file2 > 4.5 45 file2 > ..................... > >>>>>>>>>>>> > Antje ha scritto: >> Hello, >> >> I'm looking for a solution for the following problem: >> >> 1) I have a folder with several csv files; each contains a set of >> measurement values >> > ______________________________________________ R-help@stat.math.ethz.ch 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.