Thanks Phil and Dimitris! This works perfectly! At this stage I am not concerned about efficiency although I am curious if there is a way to do without copying, for instance with pointers like in C.
Thanks again, Werner --- Dimitris Rizopoulos <[EMAIL PROTECTED]> schrieb: > try the following (untested): > > tb1 <- tb2 <- tb3 <- matrix(1:100, 10, 10, dim = > list(NULL, > LETTERS[1:10])) > > lis <- list("tb1", "tb2", "tb3") > for(i in seq(lis)){ > tb <- get(lis[[i]]) > colnames(tb) <- tolower(colnames(tb)) > assign(lis[[i]], tb) > } > > > I hope it helps. > > Best, > Dimitris > > ---- > Dimitris Rizopoulos > Ph.D. Student > Biostatistical Centre > School of Public Health > Catholic University of Leuven > > Address: Kapucijnenvoer 35, Leuven, Belgium > Tel: +32/(0)16/336899 > Fax: +32/(0)16/337015 > Web: http://med.kuleuven.be/biostat/ > > http://www.student.kuleuven.be/~m0390867/dimitris.htm > > > ----- Original Message ----- > From: "Werner Wernersen" <[EMAIL PROTECTED]> > To: "Benilton Carvalho" <[EMAIL PROTECTED]> > Cc: <r-help@stat.math.ethz.ch> > Sent: Thursday, November 16, 2006 4:06 PM > Subject: Re: [R] modifying colnames of tables in a > loop > > > > That's almost perfect! Only the operation > > colnames(get(x)) <- > > seems not to be defined. > > > > Now I can't figure out how to assign the colnames > of > > the object in the original environment. > > > > Thanks, Benilton! > > > > --- Benilton Carvalho <[EMAIL PROTECTED]> > schrieb: > > > >> how about: > >> > >> for (x in l) colnames(get(x)) <- > >> lower.case(colnames(get(x))) > >> > >> b > >> > >> On Nov 16, 2006, at 9:01 AM, Werner Wernersen > wrote: > >> > >> > Hi, > >> > > >> > I have a list with the names of tables, e.g. > >> > l <- c("t1","t2","t3") > >> > and I want to change the colnames of each of > the > >> > tables in a for loop like this: > >> > for (x in l) { > >> > colnames(eval(x)) <- > >> lower.case(colnames(eval(x))) > >> > } > >> > > >> > This does not work but could someone give me > some > >> help > >> > to get on the right track? > >> > > >> > Thanks a million, > >> > Werner > >> > > >> > ______________________________________________ > >> > 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. > >> > > > > ______________________________________________ > > 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. > > > > > Disclaimer: > http://www.kuleuven.be/cwis/email_disclaimer.htm > > ______________________________________________ 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.