[R] stopifnot with logical(0)

[peter dalgaard]

> On 12 Dec 2015, at 10:54 , Martin Maechler <maechler at stat.math.ethz.ch> wrote:
> 
> My conclusion: Breaking such a fundamental lemma of logic as 
>  "the empty set is always true"

Umm, that doesn't make sense to me. Surely you mean that "an AND-operation over an empty index set is TRUE"? A similar OR operation is FALSE, i.e. they behave like empty products and sums, respectively.

-- 
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
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