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Re: Just some thousands of combinations...

  • To: mathgroup at smc.vnet.net
  • Subject: [mg109935] Re: Just some thousands of combinations...
  • From: Patrick Scheibe <pscheibe at trm.uni-leipzig.de>
  • Date: Sun, 23 May 2010 07:20:11 -0400 (EDT)
  • References: <201005230717.DAA05139@smc.vnet.net>

Hi,

data = RandomSample[Subsets[Range[90], {5}], 3000];

works fine here: "7.0 for Linux x86 (64-bit) (February 18, 2009)"

Cheers
Patrick

On Sun, 2010-05-23 at 03:17 -0400, Dr. Bruno Campanini wrote:
> Subsets[Range[90],{5}]  should print all the
> Binomial[90,5] = 43 949 268 combinations.
> 
> On my PC (4gb RAM) Mathematica 7.0 claims
> "Not enough memory".
> 
> By the way, I only need to print some thousands
> of these combinations, then Subsets[Range[90],{5}, 3000]
> works fine.
> But it prints the first 3000 combination in lexicographic
> order. How to get 3000 random out of 43 949 268, not
> ordered?
> 
> Bruno 
> 



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