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Re: No more memory available problem with LinearSolve

• To: mathgroup at smc.vnet.net
• Subject: [mg93850] Re: [mg93791] No more memory available problem with LinearSolve
• From: Daniel Lichtblau <danl at wolfram.com>
• Date: Thu, 27 Nov 2008 05:29:34 -0500 (EST)
• References: <200811261011.FAA19521@smc.vnet.net>

ChanglingZou at gmail.com wrote:
> HI,
> 
> There is a problem when I use the "LinearSolve" in Mathematica 6.
> 
> The Code is:
> 
> M = Table[Random[], {10000}, {10000}];
> a = Table[Random[], {10000}, {1}];
> LinearSolve[M, a];
> 
> and I run these codes step by step in my computer with 3G ram, find
> that only 800M ram is used to set the matrix. There are still 2G ram
> free, but the LinearSolve does not work, just tell me "No more memory
> available".
> 
> And I tried another code:
> 
> M = Table[Random[], {10000}, {10000}];
> M2 = Table[Random[], {10000}, {10000}];
> 
> It is funny! " No more memory available" too!
> 800M ram for the first matrix, and 2000M ram is not enough for
> another.
> 
> Is there any mistakes in my code? or is it A Bug in Methematica?
> Anyway, my research is limited by this problem.
> How to avoid this?
> Thanks a lot for Any help.
> 
> Changling

You are up against a size limit. It might possibly run on a 64 bit machine.

There is a bit more information to be gleaned from the notes (and 
threads) referenced by the URLs below.

http://forums.wolfram.com/mathgroup/archive/2004/Apr/msg00112.html

http://groups.google.com/group/sci.math.symbolic/msg/44bd24ad367e4077?dmode=source

Daniel Lichtblau
WOlfram Research

• References:
  • No more memory available problem with LinearSolve
    • From: "ChanglingZou@gmail.com" <ChanglingZou@gmail.com>