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

[Henrique Dallazuanna]

Try this;

x[,setdiff(colnames(x), 'a')]


On Mon, Nov 2, 2009 at 11:31 PM, 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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-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O