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MathGroup Archive 2009

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DeleteCases

  • To: mathgroup at smc.vnet.net
  • Subject: [mg98144] DeleteCases
  • From: Filippo Miatto <sottosupremo at gmail.com>
  • Date: Tue, 31 Mar 2009 04:19:23 -0500 (EST)

Dear all,
Given this example list:

{{0, 0, 1, 1}, {0, 0, 2, 2}, {0, 0, 3, 3}, {1, 1, 0, 0}, {1, 1, 2, 2},  
{1, 1, 3, 3}, {2, 2, 0, 0}, {2, 2, 1, 1}, {2, 2, 3, 3}, {3, 3, 0, 0},  
{3, 3, 1, 1}, {3, 3, 2, 2}}

I need the elements {a,a,b,b} and {b,b,a,a} to be the same, i.e. i  
want to delete one of the two occurrences from the list. (or all but  
one if the condition is more complicated, say {a,b,c,d} and {b,a,c,d}  
or {a,b,c,d} and {a,b,d,c})
How can i do that? Can i use DeleteCases? if so, what conditional  
should I use to compare different elements in the list?
I tried without success for all the night.. (it's 6.15AM now!)
Thank you,

Filippo


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