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Permutations of a sequence - variation 2

  • To: mathgroup at smc.vnet.net
  • Subject: [mg76175] Permutations of a sequence - variation 2
  • From: Virgil Stokes <vs at it.uu.se>
  • Date: Thu, 17 May 2007 06:01:16 -0400 (EDT)

Suppose I have a sequence:

  {1,2,3,4,5}

and I would like to generate all permutations of this sequence with the 
constraint that the last element not be the same as the first.
Thus,

  {2,5,3,1,4}

is acceptable; but,

  {2,5,3,4,1}

is not.

Are there Mathematica commands that allow this to be done efficiently 
for a sequence {1,2,...,n}? Note, the solution of this problem can be 
used to solve the earlier problem that I posted on sequence permutations.

--V. Stokes


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