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MathGroup Archive 2005

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Re: Mathemaica 5.2 are the 64 Bit an illusion !!!....?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg60611] Re: Mathemaica 5.2 are the 64 Bit an illusion !!!....?
  • From: Dave Seaman <dseaman at no.such.host>
  • Date: Thu, 22 Sep 2005 02:08:06 -0400 (EDT)
  • Organization: Information Technology at Purdue
  • References: <dgr2cl$85f$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

On Wed, 21 Sep 2005 07:33:41 +0000 (UTC), LumisROB wrote:
> Verified to fund both on Windows that on other OS : Mathematica 5.2
> and the 64 bit are an illusion. You try on any system to create 4
> numerical random matrixes of 10^4*10^4 elements (they should occupy
> around 4GB.Mathematica uses the packeds array in which every number of
> car occupies 8 bytes) but.... mathematica interrupts the calculation
> for lack of memory . A tool that it affirms to be to 64 bit doesn't
> have to do this...... or no?

> Thanks for the help

> Rob

Incorrect.  First of all, your arithmetic is wrong, since 10^4 * 10^4 * 8 is
only 800 MB, not 4 GB.  Secondly, I have created arrays bigger than 9 GB using
Mathematica 5.2 on a Mac G5.



-- 
Dave Seaman
Judge Yohn's mistakes revealed in Mumia Abu-Jamal ruling.
<http://www.commoncouragepress.com/index.cfm?action=book&bookid=228>


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