Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2004
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2004

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Combinations

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49827] Re: Combinations
  • From: Paul Abbott <paul at physics.uwa.edu.au>
  • Date: Tue, 3 Aug 2004 01:10:59 -0400 (EDT)
  • Organization: The University of Western Australia
  • References: <ced7i3$q4k$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

In article <ced7i3$q4k$1 at smc.vnet.net>,
 "E. Martin-Serrano" <eMartinSerrano at houston.rr.com> wrote:

> The following seems to be a generalization of David's solution for input of
> any length.
> 
> MyCombinations[list_List]:=
>   Module[{step1},
>  
> step1=Flatten[Outer[List,Sequence@@Array[list&,Length[list]]],Length[list]-1
> ];
>      StringJoin[#1]&/@( Map[SymbolName,#]&/@step1)
>     ]

A slight improvement (using StringJoin in Outer instead of using List):

  MyCombinations[list_List] := 
   With[{n=Length[list]}, Flatten[Outer[StringJoin, 
   Sequence @@ Map[ToString, Table[list, {n}], {2}]], n - 1]]

Cheers,
Paul

-- 
Paul Abbott                                   Phone: +61 8 9380 2734
School of Physics, M013                         Fax: +61 8 9380 1014
The University of Western Australia      (CRICOS Provider No 00126G)         
35 Stirling Highway
Crawley WA 6009                      mailto:paul at physics.uwa.edu.au 
AUSTRALIA                            http://physics.uwa.edu.au/~paul


  • Prev by Date: Changing ErrorBar colors but keeping serifs
  • Next by Date: Re: The Histogram[] command
  • Previous by thread: RE: Changing ErrorBar colors but keeping serifs
  • Next by thread: Re: Using "Sum" (i = 1 ... N) in a function definition