Hi Your example is rather confusing - partly because HTML formating, partly because weird coding.
You probably could concatenate your data frames e.g. by rbind or merge and after that you could try to aggregate them somehow. I could construct example data.frames myself but most probably they would be different from yours and also the result would not be necessary the same as you expect. You should post those data frames as output from dput(data) and show us real desired result from those example data frames. Cheers Petr > -----Original Message----- > From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Ek Esawi > Sent: Wednesday, February 21, 2018 3:34 AM > To: r-help@r-project.org > Subject: [R] Aggregate over multiple and unequal column length data frames > > Hi All-- > > I have generated several 2 column data frames with variable length. The data > frames have the same column names and variable types. I was trying to > aggregate over the 2nd column for all the date frames, but could not figure > out > how. > > I thought i could make them all of equal length then combine them in 1 data > frame where i can use aggregate, the formula version Or to put them in a list > and loop use lapply but did not know how to do that and thought there might > be a simpler way. > > Below is an example of 3 data frames and the desired result; note that some > levels don't appear in all and may be null over all variable, like the case > of dd > on the desired result which i would like to list all levels even if some are > all null. > > Thanks in advance, > > EK > > df1 df2 df3 > > c1 c2 c1 c2 c1 c2 > 1 aa 1 bb 1 aa > 2 aa 2 bb 2 aa > 3 bb 3 cc > 4 cc 4 bb > 5 bb > > desired result > > c1 c2 c2 c2 > aa 2 2 > bb 1 2 2 > cc 1 1 > dd > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. ________________________________ Tento e-mail a jakékoliv k němu připojené dokumenty jsou důvěrné a jsou určeny pouze jeho adresátům. 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