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>

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

• Prev by Date: Re: Combination List
• Next by Date: PrimePi and limit of argument
• Previous by thread: Re: Combination List
• Next by thread: Re: Combination List