[R] Warning when trying to access a variable out of scope?

[Steve Lianoglou]

Hi,

I was wondering if I could get R to warn me, or give me a rude  
awakening somehow, if I'm accessing a variable that is out of my  
function's scope.

For example, often times I'm creating a function as I'm testing it in  
the REPL, copying and pasting between both.

As a simple example, I might end up with a function like:

f <- function(a, b) {
   a + b.test
}

Where b.test was defined in my workspace as I'm mucking about in the  
REPL, but "clearly" I should have written:

f <- function(a,b) {
   a + b
}

I could go on for a while in my session w/o noticing the problem  
(since b.test is in my global env), and unbeknownst to me, my function  
will keep accessing the "b.test" variable when I really want it to  
work on the "b" var that I'm passing in to it.

Is there some setting or someway I can get R to warn me that "b.test"  
is being accessed outside the scope of my function?

Thanks,
-steve

--
Steve Lianoglou
Graduate Student: Physiology, Biophysics and Systems Biology
Weill Medical College of Cornell University

Contact Info: http://cbio.mskcc.org/~lianos/contact