character substitution within a variable name
On 11-11-23 3:23 PM, matric wrote:
Thanks Duncan, I knew it. But if I use the complete variable name, I'll have far too many arguments for my function....
Maybe a new design is in order. Duncan Murdoch
On 23 November 2011 20:59, Duncan Murdoch-2 [via R] <ml-node+s789695n4101308h84 at 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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