Or simpler:
df[, paste("A","C",sep="")]
df[[paste("A","C",sep="")]]
Or:
x <- paste("A","C",sep="")
df[,x]
df[[x]]
Btw, you don't need to use cbind(), data.frame() does it already
Ivan
Le 12/3/2010 08:21, Santosh Srinivas a écrit :
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
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