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.