Re: Combinations

• To: mathgroup at smc.vnet.net
• Subject: [mg49697] Re: [mg49672] Combinations
• From: János <janos.lobb at yale.edu>
• Date: Thu, 29 Jul 2004 07:43:06 -0400 (EDT)
• References: <200407271100.HAA11164@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```With Outer you need a function as the first parameter.  Being a newbie
I would go with:

Flatten[Outer[List, {a, b, c}, {a, b, c}, {a, b, c}], 2]

János

P.S.  Look back on the list for any postings to "All combinations" from
April this year.  Here is what I got back from Andrzej Kozlowski

AllCombinations[S_List,k_]:=Distribute[Table[S,{k}],List]

pretty comprehensive and deep.

On Jul 27, 2004, at 7:00 AM, 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
>
>
------
"..because Annushka has already bought sunflower oil, and not only
bought it, but spilled it too."
Bulgakov:  Master and Margarita

```

• References:
• Combinations
• From: Gregory Lypny <gregory.lypny@videotron.ca>
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