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Intersection problem

• To: mathgroup at smc.vnet.net
• Subject: [mg125962] Intersection problem
• From: Cisco Lane <travlorf at yahoo.com>
• Date: Tue, 10 Apr 2012 02:27:28 -0400 (EDT)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com

I need to select out the elements of the first list whose first elements are contained in the second list. For example

first list: {{a,x},{b,y},{c,z}}

second list: {b,c,d}

result: {{b,y},{c,z}}

Is there a quick way to do this? Intersection, maybe somehow?

• Follow-Ups:
  • Re: Intersection problem
    • From: Barrie Stokes <Barrie.Stokes@newcastle.edu.au>
  • Re: Intersection problem
    • From: Christoph Lhotka <christoph.lhotka@fundp.ac.be>
  • Re: Intersection problem
    • From: Bob Hanlon <hanlonr357@gmail.com>
  • Re: Intersection problem
    • From: Adriano Pascoletti <adriano.pascoletti@uniud.it>
  • Re: Intersection problem
    • From: "Harvey P. Dale" <hpd1@nyu.edu>
  • Re: Intersection problem
    • From: Fred Simons <f.h.simons@tue.nl>