try this ..
df[,colnames(df)==paste("A","C",sep="")]
On Fri, Dec 3, 2010 at 12:05 PM, Yuan Jian <jayuan2...@yahoo.com> wrote:
> Hello,
>
> I tried to use a variable to refer colname, but I got error, could anyone
> give me advice?
>
>>df=data.frame(cbind(AB=1:3,AC=3:5))
>> df$AC
> [1] 3 4 5
>> df$paste("A","C",sep="")
> Error: attempt to apply non-function
>
> thanks
> Jian
>
>
>
>
> [[alternative HTML version deleted]]
>
>
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>
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