...does what it says on the tin. Yes/No/Tickybox.
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(no subject)
(no subject)
(no subject)
(no subject)
(no subject)
(no subject)
(no subject)
(no subject)
> NA & TRUE
[1] NA
> tmp <- c(1,2,3,NA)
> tmp>=3
[1] FALSE FALSE TRUE NA
> tmp[tmp>=3]
[1] 3 NA
Yes, that's right, the array selection syntax treats NA as TRUE.