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Re: Probably memory problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg88091] Re: Probably memory problem
  • From: David Bailey <dave at Remove_Thisdbailey.co.uk>
  • Date: Thu, 24 Apr 2008 05:57:41 -0400 (EDT)
  • References: <fumr02$sef$1@smc.vnet.net>

Alejandra Lozada wrote:
> Dear MathGroup,
> 
> _____________________________________
> Question:
> Do anyone knows if using the palletes (Alebraic Manipulation,
> BasicMathInput,
> BasicTypesetting) in Mathematica 6 needs more stack memory that writing
> algebra in full form?
> ______________________________________
> Problem:
> 
> I am interested in check an equality:
> 
> Side 1= Side 2 of the form:
> 
> 24*n*y*y=-4*b+2*v*z-v*v/k*e^z
> 
> With y,b,v,z,k,n variables which all but n
> are veeeeeery long expressions of the form:
> y:=
> b:=
> etc...
> and to make them look shorter I defined other
> expressions, so that y, b, v, etc, need
> other expressions to be complete.
> 
> I know that the equality is analitically true, but
> I get using TrueQ(side 1, side2), PossibleZeroQ,
> that the equality is False.
> __________________________________________
> 
> Options:
> So, I think that the problem could be in:
> - Lack of memory, because Mathematica stops evaluating
> the notebook after the 16th definition,
> although I asked Mathematica about the memory used:
> MemoryInUse= 6,314,760 bites just before it stopped
> evaluating the notebook but I think Mathematica=B4s limit
> is about 19,654,528 bites.
> -Maybe I do not have enough computer memory, but
> I have 1GBite of RAM=1,073,741,824 bites.
> -Maybe I did not write well the definitions.
> ___________________________________________
> 
> 
> Any comments or suggestions will be very appreciated, :)
> thank you very much in advance,
> 
> Alejandra Lozada
> 
> 
It really doesn't sound as though this is a memory problem, perhaps you 
should post a link to a copy of the notebook and let someone look at it.

David Bailey
http://www.dbaileyconsultancy.co.uk


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