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
>
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