[R] Empty Set In a Set

[Duncan Murdoch]

On 29/04/2008 9:39 PM, Jason Q. McClintic wrote:
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> Dear List:
> 
> I'm looking for a form of the empty set such that if ES is said
> representation,
> 
> ~    ES %in% c(1,2,3)
> 
> evaluates to TRUE.

%in% is a vector operator, checking each element of ES and returning a 
vector result.  It sounds like you want a subset test, i.e. to check 
that all the results are TRUE,

all(ES %in% c(1,2,3))

which returns TRUE when ES is empty.

Duncan Murdoch

> 
> Thank you in advance for your assistance.
> 
> Sincerely,
> 
> Jason Q. McClintic
> - --
> Jason Q McClintic
> UST MB 1945
> 2115 Summit Avenue
> St. Paul, MN 55105
> jqmcclintic at stthomas.edu
> mccl0219 at tc.umn.edu
> 
> "It is insufficient to protect ourselves with laws, we must protect
> ourselves with mathematics."--Bruce Schneier
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