[R] unique

Rainer Schuermann rainer.schuermann at gmx.net
Tue Oct 16 17:05:49 CEST 2012

If I understand your problem correctly (as Milan has pointed out, sample data and code would help enormously) this should get you where you want:

unique( shopdata$name[ shopdata$employee > 10 ] )

If not, something is wrong from the outset (or with my understanding, but then  ...  see above)!


On Tuesday 16 October 2012 14:45:37 paladini wrote:
> Hello everybody,
> I've got a problem concerning the function unique. I have got a 
> data.frame "shopdata" with 1000 shop which were evaluated at different 
> points in time.
> With function subset I chose those shops with more then 10 employee and 
> store it in data.frame "bigshopdata" with 700 shops.
>   bigshopdata=subset(shopdata, shopdata$employee>10)
> Now I use unique(bigshopdata$name) to ensure that each shop name is 
> only listed  ones and not two or three times because of an evaluation at 
> different dates.
> What happens is that unique eliminates also those shops names which 
> appear only ones in bigshopdata but twice or more often in shopdata.
> But that is not what I want to. I'm only interessted in multiple 
> appearance in bigshopdata not in an possible multible appearance in the 
> original data.farme.
> How can I use unique to get what I want? Or is there an alternative 
> function?
> I hope I explained the problem good enought.
> Best regards
> Claudia
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