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MathGroup Archive 2005

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Need a functional process for this.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg55589] Need a functional process for this.
  • From: Steve Gray <stevebg at adelphia.net>
  • Date: Wed, 30 Mar 2005 03:22:03 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

	I have two lists, aa and bb. aa has the general form {2,5,7,9,11,...}
(or{{2},{5},{7},{9},{11},?}}), and bb has the general form {{6,4},{9,2},{5,6},{3,8},?}. If either
the first or second element in any sublist (pair of integers) of bb matches any element in aa, I
want to delete that sublist from bb. In the above example, neither member of {6,4} or {3,8} belongs
to aa, while at least one element of {9,2} and {5,6} belongs to aa, so bb becomes {{6,4},{3,8}}. If
aa had only one element, for example 7, I could do bb=Delete[bb,Position[bb,{x_,7}|{7,y_}]], but I
don't know how to do it for several values instead of just "7" without using a procedural loop. 
	What is a good functional way to do this?
	Thank you for any tips.

Steve Gray


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