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Re: Re: DeleteCases

  • To: mathgroup at smc.vnet.net
  • Subject: [mg98217] Re: [mg98187] Re: [mg98144] DeleteCases
  • From: Filippo Miatto <miatto at gmail.com>
  • Date: Fri, 3 Apr 2009 04:33:21 -0500 (EST)
  • References: <200903310919.EAA03943@smc.vnet.net> <200904011059.FAA28815@smc.vnet.net>

Thank you guys, you always come up with brilliant solutions!
Filippo

On Apr 1, 2009, at 12:59 PM, DrMajorBob wrote:

> seq = {{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}};
> same[{a_, a_, b_, b_}, {b_, b_, a_, a_}] = True;
> same[__] = False;
> Union[seq, SameTest -> same]
>
> or
>
> Tally[seq, same][[All, 1]]
>
> Bobby
>
> On Tue, 31 Mar 2009 04:19:23 -0500, Filippo Miatto
> <sottosupremo at gmail.com> wrote:
>
>> 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
>>
>
>
>
> -- 
> DrMajorBob at bigfoot.com
>



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