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Lists: how to?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg110000] Lists: how to?
  • From: "S. B. Gray" <stevebg at ROADRUNNER.COM>
  • Date: Fri, 28 May 2010 07:21:54 -0400 (EDT)
  • Reply-to: stevebg at ROADRUNNER.COM

Hello:

I have this line

subs3 = Subsets[Range[numbr], {3}] which for numbr=7 gives subs3=

{{1,2,3}, {1,2,4}, {1,2,5}, {1,2,6}, {1,2,7}, {1,3,4}, {1,3,5},
  {1,3,6}, {1,3,7}, {1,4,5}, {1,4,6}, {1,4,7}, {1,5,6}, {1,5,7},
  {1,6,7}, {2,3,4}, {2,3,5}, {2,3,6}, {2,3,7}, {2,4,5}, {2,4,6},
  {2,4,7}, {2,5,6}, {2,5,7}, {2,6,7}, {3,4,5}, {3,4,6}, {3,4,7},
  {3,5,6}, {3,5,7}, {3,6,7}, {4,5,6}, {4,5,7}, {4,6,7}, {5,6,7}}

Given one of these sublists, say {1,4,5}, I want a nice way to delete 
all members of the subs3 list which have 1,4, or 5 in any one of the 
three positions. The reduced list in this example would be
{{2,3,6}, {2,3,7}, {2,6,7}, {3,6,7}}.

The way I'm doing it runs DeleteCases nine times. Is there a better way?

Steve Gray


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