I think ONE answer to what you actually want to do might be
f <- function(dataf, col1 = "column1", col2 = "column2") {
dataf[[col1]] <- dataf[[col2]] # just as an example
dataf
}
-----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
Behalf Of Alexander Shenkin
Sent: Wednesday, August 12, 2009 9:27 AM
To: r-help@r-project.org
Subject: [R] Symbolic references - passing variable names into functions
Hello All,
I am trying to write a function which would operate on columns of a
dataframe specified in parameters passed to that function.
f = function(dataf, col1 = "column1", col2 = "column2") {
dataf$col1 = dataf$col2 # just as an example
}
The above, of course, does not work as intended. In some languages one
can force evaluation of a variable, and then use that evaluation as the
variable name. Thus,
> a = "myvar"
> (operator)a = 1
> myvar
[1] 1
Is there some operator which allows this symbolic referencing in R?
Thanks,
Allie
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