Hello,

I'm porting over some code from pure R to RPy2.1 (because I'm using R only to 
perform the calculations, as I much prefer the data in other structures that 
are more efficient) and I stumbled upon a function (which I didn't originally 
write) that uses "which".

As far as I can remember, there isn't a perfect equivalent in Python: the 
alternative would be using "which" with "robjects.r("expressiongoeshere")" but 
as the object is created "outside" I would like to avoid that. 

The "offending" code is (in R):

length(which(keys == mydata$label))

(mydata is a R list - hence I would be able to use the .rx2 accessor)

Has anyone got a hint on how to translate this using rpy 2.1.x?

Thanks!

-- 
Luca Beltrame, Ph.D. 
Post-doctoral research fellow - Duccio Cavalieri group
Department of Pharmacology, University of Firenze

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