On Dec 10, 2012, at 4:55 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?
If you program so that you "trick" your tool, you will fail to
progress in understanding it>
Since NA | TRUE returns TRUE (and is clearly documented as such) this
is not trickery:
> x < 5 & (is.na(y) | x-y == 0)
[1] TRUE TRUE TRUE TRUE FALSE
--
David Winsemius, MD
Alameda, CA, USA
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