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Re: Just some thousands of combinations...

  • To: mathgroup at smc.vnet.net
  • Subject: [mg109936] Re: Just some thousands of combinations...
  • From: Scott Hemphill <hemphill at hemphills.net>
  • Date: Tue, 25 May 2010 06:31:53 -0400 (EDT)
  • References: <201005230717.DAA05139@smc.vnet.net> <htb32c$aai$1@smc.vnet.net>
  • Reply-to: hemphill at alumni.caltech.edu

Patrick Scheibe <pscheibe at trm.uni-leipzig.de> writes:

> Hi,
>
> data = RandomSample[Subsets[Range[90], {5}], 3000];
>
> works fine here: "7.0 for Linux x86 (64-bit) (February 18, 2009)"

Yes, I have the same version.  After execution, MathKernel was using
3505MB of virtual memory.

Scott


> 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 
>> 
>
>

-- 
Scott Hemphill	hemphill at alumni.caltech.edu
"This isn't flying.  This is falling, with style."  -- Buzz Lightyear


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