[R] 'all' inconsistent?

Uwe Ligges ligges at statistik.uni-dortmund.de
Mon Jan 30 16:58:48 CET 2006

Seth Falcon wrote:

> On 30 Jan 2006, ligges at statistik.uni-dortmund.de wrote:
>>Current behaviour is consistent in so far that identical(all(x),
>>!any(!x)) is TRUE and definition of any() is obvious.
> That helps, thanks.  I'm not sure I've had enough coffee to continue,
> but, for the set analogy I think we are saying:
> logical(0) is the empty set {}.
> Complement of {} is the universal set U.
> Then !logical(0)  == !{} == U.  any(U) is TRUE, isn't it?  

Hmmm, "!" is for *logical* negation, and indeed identical(logical(0), 
!(logical(0))) is TRUE, hence my first statement holds.

> I guess the real message is that you need to protect yourself by
> testing for positive length first.

Yes, indeed.


> + seth
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