[R] How to exclude certain columns by column names?

[Linlin Yan]

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
>
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