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MathGroup Archive 2004

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Re: Combinations

  • To: mathgroup at
  • Subject: [mg49710] Re: Combinations
  • From: Erich Neuwirth <erich.neuwirth at>
  • Date: Thu, 29 Jul 2004 07:43:28 -0400 (EDT)
  • References: <ce5dk5$b87$>
  • Sender: owner-wri-mathgroup at

Seq[objs_, length_] :=
      Flatten[Apply[Outer, Join[{Join}, Table[Map[List, objs],
	{i, 1, length}], {1}]], length - 1]

Seq[{a, b, c}, 3]

Gregory Lypny wrote:

> Hello everyone,
> Does Mathematica have a built-in function that will generate a simple 
> list all possible combinations of a list of strings?  For example, 
> {a,b,c}, where the elements are strings, should give 3x3=27 triplets of 
> "aaa", "aba", etc.
> I tried
> In[4]:=Outer[{a,b,c},{a,b,c},{a,b,c}]
> but I get
> {{{a, b, c}[a, a], {a, b, c}[a, b], {
>      a, b, c}[a, c]}, {{a, b, c}[b, a], {a, b, c}[b, b], {a, b,
>        c}[b, c]}, {{a, b, c}[c, a], {a, b, c}[c, b], {a, b, c}[c, c]}}
> which is going to be difficult to match with my data using BinCounts 
> and the like.
> 	Regards,
> 		Greg

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