[R] colname refered by a variable

[Keith Jewell]

or even shorter
df[,paste("A","C",sep="")]


"Santosh Srinivas" <santosh.srinivas at gmail.com> wrote in message 
news:AANLkTikcJy7BVyfBwUwmRQ4dHg4pBdau+Qh_7+K+bRt2 at mail.gmail.com...
try this ..

df[,colnames(df)==paste("A","C",sep="")]

On Fri, Dec 3, 2010 at 12:05 PM, Yuan Jian <jayuan2008 at 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
>
>
>
>
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>
>
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