Re: [Rd] Out of bounds negative index

On Fri, May 2, 2008 at 2:23 PM, Vincent Goulet <vincent.goulet_at_act.ulaval.ca> wrote:
> Hi,
>
> From the R Language Definition, Section 3.4.1:
>
> "If i is positive and exceeds length(x) then the corresponding selection is
> NA. A negative out of bounds value for i causes an error."
>
> (This is also mentioned in S Programming, footnote of page 24.)
>
> Can someone please provide an example triggering the error? Looking in
> src/main/subscript.c I could not find exception handling for |i| >
> length(x), unless the negative subscript is mixed with NAs. In other cases,
> out of bounds negative indexes just seem silently ignored.
>
> Did I missed or misinterpreted something, here?

Well, there's this:

> a <- 1:10
> a[NA]

 [1] NA NA NA NA NA NA NA NA NA NA
> a[-NA]

[1] NA

Hadley

-- 
http://had.co.nz/

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