Thanks Duncan,
I knew it. But if I use the complete variable name, I'll have far too
many arguments for my function....

On 23 November 2011 20:59, Duncan Murdoch-2 [via R]
<ml-node+s789695n4101308h84@n4.nabble.com> wrote:
> On 23/11/2011 2:29 PM, matric wrote:
>> 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,
> For indexing a dataframe, use the name as the column index:
>
> df[, var]
>
> will work.
>
> Duncan Murdoch
>
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