SpG> Might it be feasible to add, "See Also: missing" SpG> to the help page for "exists"?
SpG> Currently, one can spend hours studying the help SpG> page for "exists" without getting a clue to the answer SpG> to the post copied below. Yes. I've added such a link now... though quite disillusioned with a very vague hope that useRs would read the help page so thoroughly ... Martin Maechler, ETH Zurich SpG> Thanks, Spencer SpG> On 5/14/2011 3:30 AM, David Winsemius wrote: >> >> On May 14, 2011, at 3:30 AM, utkarshsinghal wrote: >> >>> >> Hi all, >> I want to define a function such that one of its argument if passed >> do one >> thing and if not passed do the second thing. > > ?missing > >> So basically, I have to check >> whether the argument is passed or not inside the function. I am >> trying to >> use 'exists' function to do this. >>> f = function(a,b){exists("b")} >>> f(a=3, b=4) >> [1] TRUE >> This is working as expected. >> But if I do the following: >>> f(a=3) >> [1] TRUE >> Can anybody explain why this function is returning TRUE here. >> -- >> Many thanks, >> Utkarsh >>... > David Winsemius, MD > West Hartford, CT ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel