[R] what is the "NOT IN" operator

[Duncan Murdoch]

On 07/10/2010 4:10 AM, Ivan Calandra wrote:
>   Hi,
> 
> I've just seen yesterday on ?plotmath the operator %notin%.
> This could also work I guess.

No, that's just a way to encode the symbol for "not an element of". 
It's not actually an operator that works outside of plotmath (though you 
could make it one, as others have shown...)

Duncan Murdoch

> 
> Ivan
> 
> Le 10/7/2010 07:41, Bill.Venables at csiro.au a écrit :
>> Try !(group %in% C("A", ...))
>>
>> A slightly cuter way is to define your own operator.
>>
>>> `%ni%`<- Negate(`%in%`)
>>> letters[1:3] %ni% letters[3:5]
>> [1]  TRUE  TRUE FALSE
>>
>> ________________________________________
>> From: r-help-bounces at r-project.org [r-help-bounces at r-project.org] On Behalf Of Emily Deomano [EDeomano at bses.com.au]
>> Sent: 07 October 2010 09:17
>> To: r-help at r-project.org
>> Subject: [R] what is the "NOT IN" operator
>>
>> Good day,
>> I need to subset a data by removing several rows.  I know the %in% operator, i.e.
>>
>> sub<- mydata[group %in% c("A","B","E","G"), ]
>>
>> What I need is the opposite, that is remove rows and/or columns.  What is the operator for "NOT IN"?  I tried  (i)! %in% and (ii) ^%in% and both resulted in a "could not find function" error.
>>
>>
>> Kind Regards
>>
>> Emily Deomano  |  Biometrician
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>