[R] Empty Set In a Set

[jim holtman]

Is this what you want:

> ES <- 1
> ifelse(length(ES %in% c(1,2,3)) == 0, TRUE, ES %in% c(1,2,3))
[1] TRUE
> ES <- 4
> ifelse(length(ES %in% c(1,2,3)) == 0, TRUE, ES %in% c(1,2,3))
[1] FALSE
> ES <- NULL
> ifelse(length(ES %in% c(1,2,3)) == 0, TRUE, ES %in% c(1,2,3))
[1] TRUE
>


On Tue, Apr 29, 2008 at 9:39 PM, Jason Q. McClintic
<jqmcclintic at stthomas.edu> 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.
>
> 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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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?