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

[utkarshsinghal]

Thanks David. Big help, problem solved.

Regards,
Utkarsh



-------- Original Message  --------
Subject: Re: [R] calling "exists" function inside 
another function is not working
From: David Winsemius <dwinsemius at comcast.net>
To: utkarshsinghal 
<utkarsh.singhal at global-analytics.com>
Cc: r help <r-help at r-project.org>, Utkarsh Singhal 
<utkarsh.iit at gmail.com>
Date: Sat 14 May 2011 04:00:01 PM IST

>
> 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
>
>