[R] compare 2 vectors

[Romain Francois]

Christophe Pallier wrote:
> On 6/28/07, João Fadista <Joao.Fadista at agrsci.dk> wrote:
>   
>> I would like to take out the values from one vector that are equal to the
>> values in another vector.
>>
>> Example:
>> a <- c(1,2,3,4,5,6,7,8,9)
>> b <- c(3,10,20,5,6)
>> b_noRepeats = c(10,20)
>>
>>
>>     
>  b[!(b %in% intersect(a,b))]
>
> See ?intersect
>   
Hi,

There is also a pretty useful operator %w/o% in the help page of %in%. see :

 > ?`%in%`
 > a <- c(1,2,3,4,5,6,7,8,9)
 > b <- c(3,10,20,5,6)
 > b %w/o% a
[1] 10 20

Cheers,

Romain

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