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MathGroup Archive 2007

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Re: All permutations of a sequence

  • To: mathgroup at smc.vnet.net
  • Subject: [mg76277] Re: All permutations of a sequence
  • From: Dave Seaman <dseaman at no.such.host>
  • Date: Fri, 18 May 2007 06:35:34 -0400 (EDT)
  • Organization: Information Technology at Purdue
  • References: <f2h8t7$v4$1@smc.vnet.net>

On Thu, 17 May 2007 09:56:55 +0000 (UTC), Virgil Stokes wrote:
> I would like to get all unique permutations of a sequence (e.g. 
> {1,2,3,4,5,6,7,8,9,10,11,12,13}) with the constraint that all sequences 
> that have an opposite ordering are not included (e.g. {13, 12, 
> 11,10,9,8,6,5,4,3,2,1}) would not be included.

> Are there some Mathematica commands that can be used to efficiently 
> generate these permutations?

Surely every sequence has an opposite ordering, leaving you with nothing to
list.



-- 
Dave Seaman
Oral Arguments in Mumia Abu-Jamal Case to be heard May 17
U.S. Court of Appeals, Third Circuit
<http://www.abu-jamal-news.com/>


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