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Re: element selection

Bruyndonckx P. wrote:
> I have two long sorted lists of Integers.  If the difference between
a number in list 1 and a
> number in list 2 is less than a certain value, both are selected to
create a couple.  I am
> looking for a fast way to go through both lists and extract these
elements to create a new list
> of couples.  I tried a number of things, but all of them were rather
slow so I need some expert
> advice here.
> Thx,
> Peter

Select[ Transpose@{list1,list2}, Abs[Subtract@@#] < cutoff & ]

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