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MathGroup Archive 1997

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Fwd: List manipulation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg7428] Fwd: [mg7390] List manipulation
  • From: BobHanlon at aol.com
  • Date: Sat, 31 May 1997 15:08:05 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

The function that you want is KSubsets within the standard package 
DiscreteMath`Combinatorica`

Needs["DiscreteMath`Combinatorica`"]

data1 = Range[4];  data2 = Range[8];

KSubsets[data1, 3]

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

Length[KSubsets[data2, 4]]

70


Bob Hanlon
---------------------
Forwarded message:
From:	nandgopa at math.tifr.res.in (V. Nandagopal)
To: mathgroup at smc.vnet.net
To:	mathgroup at smc.vnet.net

Hello,

	I have a list X={1,2,3,4,5,6,7,8}. How do I get a list of the
folllowing kind:

	S={{1,2,3,4}, {1,2,3,5}, {1,2,3,6}, .....}. 

S will have 8-choose-2 = 70 elements. Each element of S should have length
4.

	Is there any function which does such list making? Something of
the form 

	?????[list, n]

	Thanks in advance.


	V. Nandagopal
	School of Mathematics
	Tata Institute of Fundamental Research
	Colaba, Bombay 400 005, India

	e-mail: nandgopa at math.tifr.res.in






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