Is this what you want > dt <- data.frame(a = c(1, 2, 3), b = c(3, 2, 2), c = c(1, 3, 5)) > for (i in 1:2){ + dt[[paste('test',i,sep="")]] <- rep(i,3) + } > dt a b c test1 test2 1 1 3 1 1 2 2 2 2 3 1 2 3 3 2 5 1 2 >
On Thu, Jun 26, 2008 at 12:23 PM, Dong-hyun Oh <[EMAIL PROTECTED]> wrote: > Dear UseRs, > > I would like to know the way to create a new column by naming it > simultaneously. > For example, in for() loop I want to create columns named as paste("test", > i, sep = ""), as shown below. > > ---------------------------- > dt <- data.frame(a = c(1, 2, 3), b = c(3, 2, 2), c = c(1, 3, 5)) > > for(i in 1:2){ > dt$as.name(paste("test", i, sep = "")) <- rep(i, 3) > } > -------------------------- > > Error message of above command is as follows: > -------------------------- > Error in dt$as.name(paste("test", i, sep = "")) <- rep(i, 3) : > target of assignment expands to non-language object > -------------------------- > > > The structure of data.frame I want is as follows: >> dt > a b c test1 test2 > 1 3 2 1 2 > 2 2 3 1 2 > 3 2 5 1 2 > > Any help? > > Thank you in advance. > > Best, > > > > ========================================================= > Dong-hyun Oh > Center of Excellence for Science and Innovation Studies > Royal Institute or Technology, Sweden > e-mail: [EMAIL PROTECTED] > cel: +46 73 563 45 22 > > ______________________________________________ > 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. > -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem you are trying to solve? ______________________________________________ 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.