Always nice to answer my own question 3 minutes later. The missing()
function does what I want. Still, why DOES this exists() statement
fail? Do functions "auto create" the variables once they are called,
regardless of whether or not they are assigned?
--j
On Fri, Jun 25, 2010 at 1:05 PM, Jonathan Greenberg
<greenb...@ucdavis.edu> wrote:
> I'm a bit confused about how exists() work within a function -- I want
> to test for unassigned variables, but I'm doing tests in the main
> environment to figure out the function, so the variables DO exist in
> the parent environment of a function call.
>
> Why does:
> myfunction <- function(variable_outside_function)
> {
> print(exists("variable_outside_function",inherit=FALSE))
> print(exists("another_variable_outside_function",inherit=FALSE))
> }
>
> myfunction()
>
> Return:
> [1] TRUE
> [1] FALSE
>
> I didn't assign anything to variable_outside_function, so I'm unclear
> why it thinks it exists...
>
> --j
>
______________________________________________
R-help@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.
