[R] Count factor if

[David Winsemius]

On Feb 15, 2011, at 12:18 PM, mathijsdevaan wrote:

>
> Thanks for your quick response. The solution that you propose comes  
> close to
> what I want, however by using 'FUN = order', the new variable is  
> based on
> its order rather than y< focal y. In the case of two similar rows
> (Xrow1=Xrow2 and Yrow1=Yrow2), the value of Zrow1 < Zrow2. Any  
> solutions?

First a suggestion. Please include context when following up on r- 
help. Nabble provides a simple method for doing so.

Here is a method that works despite generating a warning:

cbind(X, z = ave(X$y, X$x, FUN = seq) - 1)

>
> -- 
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> Sent from the R help mailing list archive at Nabble.com.

David Winsemius, MD
West Hartford, CT