Re: [R] Permutation problem

From: Robin Hankin <r.hankin_at_noc.soton.ac.uk>
Date: Tue 30 Jan 2007 - 12:59:34 GMT

Hi

 > library(gtools)
 > combinations(5,3)

       [,1] [,2] [,3]

[1,]    1    2    3
[2,]    1    2    4
[3,]    1    2    5
[4,]    1    3    4
[5,]    1    3    5
[6,]    1    4    5
[7,]    2    3    4
[8,]    2    3    5
[9,]    2    4    5
[10,]    3    4    5

 >

On 30 Jan 2007, at 12:22, michel lang wrote:

> Dear R-Users,
>
> I need a matrix containing line by line all possible permutations with
> length 'i' of the integers 1:N, given the restriction that the
> integers in each row have to be in ascending order.
>
> For example: N = 5, length i = 3, should result in a matrix like this:
> 1 2 3
> 1 2 4
> 1 2 5
> 1 3 4
> 1 3 5
> 1 4 5
> 2 3 4
> 2 3 5
> 2 4 5
> 3 4 5
>
> I'm grateful for any advice on how to proceed,
> Michel Lang
>
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-
> guide.html
> and provide commented, minimal, self-contained, reproducible code.

--
Robin Hankin
Uncertainty Analyst
National Oceanography Centre, Southampton
European Way, Southampton SO14 3ZH, UK
  tel  023-8059-7743

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Received on Wed Jan 31 00:04:46 2007

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