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Re: issue generating table of random numbers

  • To: mathgroup at smc.vnet.net
  • Subject: [mg81918] Re: [mg81877] issue generating table of random numbers
  • From: Carl Woll <carlw at wolfram.com>
  • Date: Sat, 6 Oct 2007 04:47:35 -0400 (EDT)
  • References: <200710050857.EAA01015@smc.vnet.net>

John Molina wrote:

>Hi, I'm running Mathematica 6 on OsX (10.4) and have been experiencing difficulties generating a table of random numbers (a table of random matrices actually). 
>matrix = Table[RandomChoice[{-1, 1}, {4, 4}], {250}]
>for a table size less than 250 it seems to work fine but for larger sizes mathematica is flattening out the lists:
>matrix[[i]] = {-1,1,1,-1}
>and not
>            = {{-1,1},{1,-1}}
>As far as I can tell this is only happening with the RandomChoice command (RandomInteger and RandomReal work fine). Does anyone know what is happening? is this a bug?
>thanks
>  
>
Definitely a bug.

A workaround is to use the simpler:

matrix = RandomChoice[{-1,1}, {250, 4, 4}]

Carl Woll
Wolfram Research


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