On 05/04/2014 06:35 PM, Michael Friendly wrote:
On 03/05/2014 12:39 PM, Hadley Wickham wrote:
Can anyone tell me what the significance of 1954 is in R's NA?
Just ask R:
> 2*(1-pnorm(1954))
[1] 0
> 2*(1-pnorm(1954)) %in% NA
[1] 0
Not sure that would make the "joke" better, but you need parentheses
around the product because it seems %in% has precedence over * (the
fact that you got a number instead of a logical gives you a hint):
> (2*(1-pnorm(1954))) %in% NA
[1] FALSE
BTW, that %in% has precedence over arithmetic operations is surprising,
error-prone, and doesn't cover any reasonable use case (who needs to
multiply the logical vector returned by %in% by some value?) but that's
another story:
> 3 + 2 %in% 1:6
[1] 4
> 3 - 2 %in% 1:6
[1] 2
> 3 * 2 %in% 1:6
[1] 3
> 3 / 2 %in% 1:6
[1] 3
Weird!
H.
>
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Hervé Pagès
Program in Computational Biology
Division of Public Health Sciences
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