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.
