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MathGroup Archive 2004

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DeleteCases : several at once, conditions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49369] DeleteCases : several at once, conditions
  • From: camerzone at yahoo.com (camerzone)
  • Date: Fri, 16 Jul 2004 06:06:59 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Suppose you have a list of lists, something like
{{1, 6, 7}, {3, 6, 9}, {1, 2, 11}, {3, 5, 9}, {2, 5, 6}, {2, 9, 11}, {
  2, 10, 11}, {3, 7, 9}, {5, 8, 11}, {3, 7, 9}, {7, 8, 9}, {2, 5, 12},
{2, 6,
    10}, {2, 10, 11}, {1, 6, 9}, {6, 10, 12}, {3, 6, 12}, {2, 5, 12},
{3, 8,
     9}, {1, 2, 7}}
and you want to delete cases matching several different patterns, say
{1,_,_} and {9,_,_}
What's the most efficient way?

Also, can you use conditions with DeleteCases?  Say, I want to delete
all cases containing even numbers?

tks


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