colname refered by a variable
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 ?crit :
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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______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Ivan CALANDRA PhD Student University of Hamburg Biozentrum Grindel und Zoologisches Museum Abt. S?ugetiere Martin-Luther-King-Platz 3 D-20146 Hamburg, GERMANY +49(0)40 42838 6231 ivan.calandra at uni-hamburg.de ********** http://www.for771.uni-bonn.de http://webapp5.rrz.uni-hamburg.de/mammals/eng/1525_8_1.php