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MathGroup Archive 1999

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Re: Enumerating Permutations

  • To: mathgroup at smc.vnet.net
  • Subject: [mg20061] Re: [mg20006] Enumerating Permutations
  • From: Ken Levasseur <Kenneth_Levasseur at uml.edu>
  • Date: Wed, 29 Sep 1999 03:33:23 -0400
  • Organization: UMass Lowell Mathematical Sciences
  • References: <199909250640.CAA01948@smc.vnet.net.>
  • Sender: owner-wri-mathgroup at wolfram.com

Vic:

There is a book titled "Enumerative Combinatorics" - the author's last
name is Stanley
 - that has algorithms for enumerating all kinds of objects, including
the one you need. I have a copy in my office, so if you need more
details I can get them for you tomorrow.

Ken Levasseur
UMass Lowell

Vic Fanberg wrote:
> 
> I am looking for an algorithm for determining the Nth permutation (P) of a
> group T.  I don't really care the ordering of the permutations within T, as
> long as all the permutations of P are members of T exactly once.  (Each
> element of the permutation P is unique.)
> 
> Actually, each of the permutations are only 7 digits long and I could list
> all 5040 permutations in a file about 35K, but I was hoping for something a
> little cleaner, in case I change to 8 or 9 digits long later.
> 
> Does anyone know of such an algorithm?
> 
> Sorry I don't have the math background to phrase the question any better.
> But I would very much appreciate any help or references you can point me to.
> 
> Vic


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