How to exclude certain columns by column names?
Try this:
x[, colnames(x) != 'a']
[1] 3 4
On Tue, Nov 3, 2009 at 9:31 AM, Peng Yu <pengyu.ut at gmail.com> 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 at 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.