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MathGroup Archive 1999

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Re: Avoid out of memory in Simplify

  • To: mathgroup at smc.vnet.net
  • Subject: [mg19564] Re: Avoid out of memory in Simplify
  • From: David Bailey <db at salford-software.com>
  • Date: Wed, 1 Sep 1999 23:07:00 -0400
  • Organization: Salford Software
  • References: <7qfmsl$al3@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

On 31 Aug 1999 00:49:25 -0400, "Toshiyuki (Toshi) Meshii"
<meshii at mech.fukui-u.ac.jp> wrote:

>Hi
>
>Please give me an advice on my problem.
>Version of my Mathematica is v3.0.1.
>
>I was suffering from error message "out of memory" on my Win98 AMD
>K6-400Mhz, 128MB machine, every time I run Simplify on a complex function.
>I thought this might be solved if I tried it on Linux environment.
>
>I tried it on Redhat 5.2, PenIII 550MHz, 512MB, HDD 9GB machine.
>Sure, I got the result faster.
>But the result was the same.
>
>Can anybody give an advice on using my resource more effectively?
>

It is hard to say without looking at the specific expression that you
wanted to simplify. Simplify and FullSimplify both seem to get bogged
down in too many alternatives if you give them very large expressions.
One general strategy might be to break up the expression if it is very
large and simplify it in bits.

Can you post the whole expression?

David Bailey
Salford Software


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