Thank your Dr. Duncan Murdoch: Yes, you are right! I look for a "mean" variable and there it was!!! It seems to work on the non-patched 2.8.1 version because I start a new session on a diferent directory, and with the patched 2.8.1 I use an already created .Rdata where a "mean" variable exist with a 0 value.
Thank you very much for your help. Sorry for this silly questions. Kenneth El mar, 24-03-2009 a las 07:07 -0400, Duncan Murdoch escribió: > On 24/03/2009 12:44 AM, Kenneth Roy Cabrera Torres wrote: > > Hi R developers and debian users: > > > > Finally I found how to work with aggregate() function > > on the last patched version fo R. > > > > I you use this command it fails: > > > > aggregate(state.x77, list(Region = state.region), mean) > > > > But if you modify it in this way, it works!: > > > > aggregate(state.x77, list(Region = state.region), function(x) mean(x) ) > > > > Is it necesary to change the example? > > > > What is changing in aggregate() function? > > I get identical results from those, but if I had a local variable (not a > function) named "mean", the first one would not work: > > > mean <- 2 > > aggregate(state.x77, list(Region = state.region), mean) > Error in FUN(X[[1L]], ...) : element 1 is empty; > the part of the args list of 'is.list' being evaluated was: > (INDEX) > > I suspect that is what is going wrong for you. > > Duncan Murdoch > > > > > > Thank you for your attention. > > > > Kenneth. > >> sessionInfo() > > > > R version 2.8.1 Patched (2009-03-18 r48193) > > x86_64-unknown-linux-gnu > > > > locale: > > LC_CTYPE=es_CO.UTF-8;LC_NUMERIC=C;LC_TIME=es_CO.UTF-8;LC_COLLATE=es_CO.UTF-8;LC_MONETARY=C;LC_MESSAGES=es_CO.UTF-8;LC_PAPER=es_CO.UTF-8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=es_CO.UTF-8;LC_IDENTIFICATION=C > > > > attached base packages: > > [1] stats graphics grDevices utils datasets methods base > > > > ______________________________________________ > > R-devel@r-project.org mailing list > > https://stat.ethz.ch/mailman/listinfo/r-devel > ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
