2 messages · Jeff Enos, François Pinard
R-devel, Below is a simple example calling split and unsplit on a numeric vector of length 2 where 'f' is c(1,NA).
unsplit(split(c(1,2), c(1,NA)), c(1,NA))
[1] 1 0 I noticed that the call to vector in unsplit gives us 0 as the 2nd element of the result. Is this the intended result, as opposed to NA? Thanks for your help, Jeff
Jeff Enos Kane Capital Management jeff at kanecap.com
[Jeff Enos]
Below is a simple example calling split and unsplit on a numeric vector of length 2 where 'f' is c(1,NA).
unsplit(split(c(1,2), c(1,NA)), c(1,NA))
[1] 1 0
I noticed that the call to vector in unsplit gives us 0 as the 2nd element of the result.
Is this the intended result, as opposed to NA?
?unsplit says: 'unsplit' reverses the effect of 'split'. and later explains: 'unsplit' returns a vector for which 'split(x, f)' equals 'value' So some may argue that, while not necessarily intended, that this is at least not unintended :-). Yet, why "0" is chosen here, among a myriad of possibilities? "NA", as you suggest, might be a more neutral choice.
Fran?ois Pinard http://pinard.progiciels-bpi.ca