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
The University of Western Australia      (CRICOS Provider No 00126G)
35 Stirling Highway
Crawley WA 6009                      mailto:paul at physics.uwa.edu.au
AUSTRALIA                            http://physics.uwa.edu.au/~paul

```

• Prev by Date: Re: two different results for Sum[Log[n]/n...
• Next by Date: Re: Simple Question -- Incrementing All Elemnts in A list by 1
• Previous by thread: Re: Out of Memory Problem (beginner)
• Next by thread: Re: Out of Memory Problem (beginner)