[R] character substitution within a variable name

[matric]

Hi,
I'd like to create a function that accepts as arguments a string that is to
be substituted within a variable name. For instance, suppose I have a data
frame df:

df<-data.frame(x_narrow=c(rnorm(100,0,1)),x_wide=c(rnorm(100,0,10)))

What I have in mind is something like:

f <- function(string){
var = paste("x_",string,sep = "")
df$var
}

which does not work. Any suggestion for modifications? Thanks in advance,
Matteo

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