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MathGroup Archive 2004

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Re: Generating r-combination or r-permutations with replacement.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg51262] Re: Generating r-combination or r-permutations with replacement.
  • From: "Steve Luttrell" <steve_usenet at _removemefirst_luttrell.org.uk>
  • Date: Mon, 11 Oct 2004 01:25:21 -0400 (EDT)
  • References: <ckajd2$m4p$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Here is a way of doing what you want:

<<DiscreteMath`Combinatorica`

KSubsets[{1,2,3,4},3]

{{1,2,3},{1,2,4},{1,3,4},{2,3,4}}

Steve Luttrell

"phil" <enfo at ucla.edu> wrote in message news:ckajd2$m4p$1 at smc.vnet.net...
> Is there an easy function in mathematica that generates a set/list that
> consists of r-combinations or r-permutations with replacement?
>
> e.g. I want the set of all possible sets with 3 elements, with entries 
> from
> {1,2,3,4}, and also the set of all possible unordered sets with 3 
> elements,
> with entries from {1,2,3,4}.
>
> Any help is appreciated,
>
> -Philip Lu
>
> 



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