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MathGroup Archive 2005

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Re: element selection

  • To: mathgroup at smc.vnet.net
  • Subject: [mg53648] Re: element selection
  • From: "Ray Koopman" <koopman at sfu.ca>
  • Date: Fri, 21 Jan 2005 06:36:20 -0500 (EST)
  • References: <csnt7e$4ec$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

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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