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Re: Combinatorial [message #40757 is a reply to message #40756]

Fri, 27 August 2004 06:51

K. Bowman
Messages: 330
Registered: May 2000

Senior Member

In article <e8ecd642.0408270539.19ddd96a@posting.google.com>,
andrade_bahia@yahoo.com.br (Adilson) wrote:

> Dear all,
> Would like to know as I make to effect combinations in the IDL I have
> a problem where I want to execute a fixed combination of elements
> contained in a vector. EX: A=[0,1,2,3,4,5 ] --> six elements I want
> to make combinations 3x3 of the elements contained in. The formed
> vector is of 6!/3!*(6-3)! = 20 elements. Example of the vector to be
> formed->[0,1,2],[0,1,3]... [3,4,5 ]. In the total of 20 combinations.
> Which the best form to execute this operation? If you to be able to
> help me would be grateful.
> I subscribe myself with the highest consideration.
> Thanks in advance for your help.
>
> Adilson

Not elegant, but I think this does what you want.

IDL> n = 6
IDL> comb = lonarr(3)
IDL> for i = 0, n-1 do for j = i+1, n-1 do for k = j+1, n-1 do comb =
[[comb], [i,j,k]]
IDL> comb = comb[*,1:*]
IDL> print, comb
0 1 2
0 1 3
0 1 4
0 1 5
0 2 3
0 2 4
0 2 5
0 3 4
0 3 5
0 4 5
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

Ken Bowman

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[Message index]

		Re: Combinatorial By: andrade_bahia on Tue, 31 August 2004 06:04
		Re: Combinatorial By: andrade_bahia on Tue, 31 August 2004 06:02
		Re: Combinatorial By: K. Bowman on Mon, 30 August 2004 10:58
		Re: Combinatorial By: andrade_bahia on Mon, 30 August 2004 07:58
		Re: Combinatorial By: David Fanning on Fri, 27 August 2004 07:16
		Re: Combinatorial By: Paul Van Delst[1] on Fri, 27 August 2004 07:12
		Re: Combinatorial By: Paul Van Delst[1] on Fri, 27 August 2004 07:11
		Re: Combinatorial By: K. Bowman on Fri, 27 August 2004 06:51

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