[R] 'all' inconsistent?

Seth Falcon sfalcon at fhcrc.org
Mon Jan 30 15:47:37 CET 2006

On 29 Jan 2006, ripley at stats.ox.ac.uk wrote:

> On Sun, 29 Jan 2006, Elizabeth Purdom wrote:
>> I came across the following behavior, which seems illogical to me.
> What did you expect and why?
>> I don't know if it is a bug or if I'm missing something:
>>> all(logical(0))
>> [1] TRUE
> All the values are true, all none of them.

I thought all the values are false, all none of them, because there
aren't any that are true:


I can see how someone might expect an error, or NA, or FALSE in the
above two cases.  It is harder for me to see when all(logical(0))
being TRUE would be useful.


+ seth

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