On 12-12-10 7:55 PM, Hans Thompson wrote:
Hello.
I have a two statement logical that if NA is returned for the second
statement I want to rely on result of the first statement. I still would
like to use both when I can though.
x <- c(1:5)
y <- c(1,2,NA,4,5)
x < 5 & x-y == 0
How can I trick R to refer back to (x < 5) where it is NA on the third
value?
Use is.na() to test for NA. I think this does what you want:
x < 5 & (is.na(x-y == 0) | x-y == 0)
Duncan Murdoch
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