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MathGroup Archive 2004

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pattern matching and droping elements from list of lists.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49742] pattern matching and droping elements from list of lists.
  • From: sean_incali at yahoo.com (sean kim)
  • Date: Thu, 29 Jul 2004 07:46:12 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

hello group, 

Outer[List, {a, b, c}, {a, b, c}, {a, b, c}]

will output 

{{
{{a, a, a}, {a, a, b}, {a, a, c}}, {{a, b, a}, {a, b, b}, {a, b, c}},
{{a, c, a}, {a, c, b}, {a, c, c}}},
{{{b, a, a}, {b, a, b}, {b, a, c}}, {{b, b, a}, {b, b, b}, {b, b, c}},
{{b, c, a}, {b, c, b}, {b, c, c}}},
{{{c, a, a}, {c, a, b}, {c, a, c}}, {{c, b, a}, {c, b, b}, {c, b, c}},
{{c, c, a}, {c, c, b}, {c, c, c}}
}}

how do I remove {a,a,a} and {b,b,b} and {c,c,c} from above? 

thanks all in advance for any insights 

sean


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