Daniel, You can see better what is going on if you look at
as.list(x) There you can see that cyl and gear are vectors but mpg and hp are matrices. You can rearrange them using the do.call() function x2 <- do.call(cbind, x) dim(x2) Jean On Fri, Nov 1, 2013 at 7:08 AM, Daniel Fernandes <daniel.fernan...@ine.pt>wrote: > > > Hello, > > > > I´m using function aggregate in R 3.0.2. If I run the instruction > x<-aggregate(cbind(mpg,hp)~cyl+gear,data=mtcars,quantile) I get the > result the following data.frame: > > > > cyl > > gear > > mpg.0% > > mpg.25% > > mpg.50% > > mpg.75% > > mpg.100% > > hp.0% > > hp.25% > > hp.50% > > hp.75% > > hp.100% > > 4 > > 3 > > 21.5 > > 21.5 > > 21.5 > > 21.5 > > 21.5 > > 97 > > 97 > > 97 > > 97 > > 97 > > 6 > > 3 > > 18.1 > > 18.925 > > 19.75 > > 20.575 > > 21.4 > > 105 > > 106.25 > > 107.5 > > 108.75 > > 110 > > 8 > > 3 > > 10.4 > > 14.05 > > 15.2 > > 16.625 > > 19.2 > > 150 > > 175 > > 180 > > 218.75 > > 245 > > 4 > > 4 > > 21.4 > > 22.8 > > 25.85 > > 30.9 > > 33.9 > > 52 > > 64.25 > > 66 > > 93.5 > > 109 > > 6 > > 4 > > 17.8 > > 18.85 > > 20.1 > > 21 > > 21 > > 110 > > 110 > > 116.5 > > 123 > > 123 > > 4 > > 5 > > 26 > > 27.1 > > 28.2 > > 29.3 > > 30.4 > > 91 > > 96.5 > > 102 > > 107.5 > > 113 > > 6 > > 5 > > 19.7 > > 19.7 > > 19.7 > > 19.7 > > 19.7 > > 175 > > 175 > > 175 > > 175 > > 175 > > 8 > > 5 > > 15 > > 15.2 > > 15.4 > > 15.6 > > 15.8 > > 264 > > 281.75 > > 299.5 > > 317.25 > > 335 > > > > So far so good, however the strange part happens when I run dim(x) or > names(x), because the results are 8 4 (dim(x)) and "cyl" "gear" "mpg" > "hp" (names(x)). Why this occurs and how do I transform it in a regular > data.frame with 12 columns? > > > > Thank you in advance, > > > > Daniel > > > > > sessionInfo() > > R version 3.0.2 (2013-09-25) > > Platform: i386-w64-mingw32/i386 (32-bit) > > > > locale: > > [1] LC_COLLATE=Portuguese_Portugal.1252 > LC_CTYPE=Portuguese_Portugal.1252 > LC_MONETARY=Portuguese_Portugal.1252 LC_NUMERIC=C > > > [5] LC_TIME=Portuguese_Portugal.1252 > > > > attached base packages: > > [1] grDevices datasets splines graphics stats tcltk utils > methods base > > > > other attached packages: > > [1] svSocket_0.9-55 TinnR_1.0-5 R2HTML_2.2.1 Hmisc_3.12-2 > Formula_1.1-1 survival_2.37-4 > > > > loaded via a namespace (and not attached): > > [1] cluster_1.14.4 grid_3.0.2 lattice_0.20-23 rpart_4.1-3 > svMisc_0.9-69 tools_3.0.2 > > > > > > "Confidencialidade: Esta mensagem (e eventuais ficheiros anexos) é > destinada exclusivamente às pessoas nela indicadas e tem natureza > confidencial. Se receber esta mensagem por engano, por favor contacte o > remetente e elimine a mensagem e ficheiros, sem tomar conhecimento do > respectivo conteúdo e sem reproduzi-la ou divulgá-la. > > Confidentiality Warning: This e-mail message (and any attached files) is > confidential and is intended solely for the use of the individual or entity > to whom it is addressed. lf you are not the intended recipient of this > message please notify the sender and delete and destroy all copies > immediately." > > > [[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. > > [[alternative HTML version deleted]]
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