Re: [R] calling "exists" function inside another function is not working

From: David Winsemius <dwinsemius_at_comcast.net>
Date: Sat, 14 May 2011 06:30:01 -0400

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. Received on Sat 14 May 2011 - 10:34:17 GMT

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