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MathGroup Archive 2007

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Re: Combination List

  • To: mathgroup at smc.vnet.net
  • Subject: [mg77914] Re: [mg77869] Combination List
  • From: DrMajorBob <drmajorbob at bigfoot.com>
  • Date: Tue, 19 Jun 2007 06:57:55 -0400 (EDT)
  • References: <31344098.1182166936799.JavaMail.root@m35>
  • Reply-to: drmajorbob at bigfoot.com

Maybe you meant:

Needs["Combinatorica`"]

Subsets[Range@4, {3}]

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

or maybe

Select[Permutations[Range@4, {3}], OrderedQ]

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

???

I have no clue what rule you used to come up with this:

> 1 2 3
> 1 2 4
> 1 3 4
> 1 4 2

Bobby

On Mon, 18 Jun 2007 06:09:40 -0500, Bruno Campanini <BC at gmail.com> wrote=
:

> I know combinations of 4 elements taken 3 by 3 is 4,
> that is Binomial[4,3] = 4
> How can I get the list:
> 1 2 3
> 1 2 4
> 1 3 4
> 1 4 2
>
> The same way I get permuations list from Permutations[{...}]
> ???
>
> Bruno
>
>



-- =

DrMajorBob at bigfoot.com


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