On 10/16/06, Hans-Peter <[EMAIL PROTECTED]> wrote:
> 2006/10/16, Duncan Murdoch <[EMAIL PROTECTED]>:
> > As Gabor said, the third way is to give no default, but test missing()
> > in the code.
>
> I forgot this one, thank you. In my case it is probably not suited as
> I just pass the arguments to a C (Pascal) function and do the checking
> there.
The R interface need not be identical to the C or Pascal interface.
Its pretty easy to convert making use of the fact that a nonexistent
else leg returns NULL:
f <- function(x) { x <- if (!missing(x)) x; x }
f() # NULL
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