[Rd] Add "See Also: missing" to help('exists')?

Spencer Graves
Sat, 14 May 2011 11:39:12 -0000

Might it be feasible to add, "See Also:  missing" to the help
page for "exists"?


       Currently, one can spend hours studying the help page for
"exists" without getting a clue to the answer to the post copied
below.


       Thanks,
       Spencer


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
>> ______________________________________________
>> R-help at 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.
>
> David Winsemius, MD
> West Hartford, CT
>
> ______________________________________________
> R-help at 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.
>