The inverse of Interset

[Phil Davis]

Hi Jim,

I suppose you could do a union (yielding a 3rd array) and an intersect 
(yielding a 4th array) and then remove the intersect elements from the 
union array. It's not what you wanted but it would work. Like so:

put arrayOne into intersectA
intersect intersectA with arrayTwo

put arrayOne into unionA
union unionA with arrayTwo

repeat for each key tKey in intersectA
     delete variable unionA[tKey]
end repeat

-- now unionA contains the anti-intersection (?) of the two original arrays

Phil Davis



On 11/10/12 9:36 AM, Jim Hurley wrote:
> The intersect command (intersect arrayOne with arrayTwo) removes the elements from arrayOne that not in arrayTwo.
>
> What I need is an array of the elements removed. Intersect leaves everything but.
>
> Is there an array operation that accomplishes this?
> The dimensions of my arrays are very large and so using "is among" on the keys is not an option.
>
> Jim Hurley
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-- 
Phil Davis