Hi Peng, Here is a suggestion:
subset(x, select = -a) See ?subset for more details. HTH, Jorge On Mon, Nov 2, 2009 at 8:31 PM, Peng Yu <> wrote: > I can exclude columns by column number using '-'. But I wondering if > there is an easy way to exclude some columns by column names. > > > x=cbind(c(1,2),c(3,4)) > > x > [,1] [,2] > [1,] 1 3 > [2,] 2 4 > > colnames(x)=c('a','b') > > x > a b > [1,] 1 3 > [2,] 2 4 > > x[,-'a'] > Error in -"a" : invalid argument to unary operator > > x[,-1] > [1] 3 4 > > ______________________________________________ > 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]] ______________________________________________ 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.