?missing

On 7/2/06, Jonathan Greenberg <jgreenberg@arc.nasa.gov> wrote:
>
> I'm a bit new to writing R functions and I was wondering what the "best
> practice" for having optional variables in a function is, and how to test
> for optional and non-optional variables?  e.g. if I have the following
> function:
>
> helpme <- function(a,b,c) {
>
>
> }
>
> In this example, I want c to be an optional variable, but a and b to be
> required.  How do I:
> 1) test to see if the user has inputted c
> 2) break out of the function of the user has NOT inputted a or b.
>
> Thanks!
>
> --j
>
> --
>
> Jonathan A. Greenberg, PhD
> NRC Research Associate
> NASA Ames Research Center
> MS 242-4
> Moffett Field, CA 94035-1000
> Phone: 415-794-5043
> AIM: jgrn3007
> MSN: jgrn3007@hotmail.com
>
> ______________________________________________
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>



-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390 (Cell)
+1 513 247 0281 (Home)

What is the problem you are trying to solve?

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