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MathGroup Archive 2003

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Re: Out of Memory Problem (beginner)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg44349] Re: Out of Memory Problem (beginner)
  • From: Paul Abbott <paul at physics.uwa.edu.au>
  • Date: Wed, 5 Nov 2003 10:02:17 -0500 (EST)
  • Organization: The University of Western Australia
  • References: <bo7pdn$am2$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

In article <bo7pdn$am2$1 at smc.vnet.net>, cedric at ddd.co.jp (Cedric) 
wrote:

> I have a matrix of 6000 x 7000.
> A = Table[i,{i,1,6000},{j,1,7000}]
> I'd like to calculate A.Transpose[A].
> But it appears "Out of Memory" problem after
> trying to calculate for a long time.
> 
> Does anybody know how i can olve the above problem?

You can obtain the general element of such a matrix: If A is of size 
m x n, 

    A = Table[i, {i, 1, m}, {j, 1, n}]; 

then 

    A . Transpose[A] ==  n Table[i j, {i, m}, {j, m}]

Cheers,
Paul

-- 
Paul Abbott                                   Phone: +61 8 9380 2734
School of Physics, M013                         Fax: +61 8 9380 1014
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Crawley WA 6009                      mailto:paul at physics.uwa.edu.au 
AUSTRALIA                            http://physics.uwa.edu.au/~paul


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