Message-ID: <4DCE69E0.4070107@prodsyse.com>
Date: 2011-05-14T11:39:12Z
From: Spencer Graves
Subject: Add "See Also: missing" to help('exists')?
In-Reply-To: <AF4C61A5-E05A-4FD7-B161-516A234D4F58@comcast.net>
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.
>