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MathGroup Archive 2007

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Re: Quick integral.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg73441] Re: [mg73393] Quick integral.
  • From: jmt <jmt at dxdydz.net>
  • Date: Fri, 16 Feb 2007 01:06:57 -0500 (EST)
  • References: <200702151001.FAA05398@smc.vnet.net>

On Thursday 15 February 2007 11:01, Jouvenot, Fabrice wrote:

> The purpose of our work is to have something really quick.
> We made some simplifications, approximations, etc.
> 
> We have now difficulties to accelerate it.
> We think we can run it faster if we ask Mathematica to calculate our
> integrals with only 2 significant numbers. But we tuned different
> parameters of Intergral to have a rude approximation of the integral and
> so have the calculus quicker than before.
> But (we are beginers with mathematica (but not in programing)) it do not
> seems to be less precise or faster.
> 

As far as I understand, you can extend the precision of your computation, but 
can hardly restraint it, because a restrained precision will finally always 
use the default plateform floating point facilities (see $MachinePrecision), 
these being faster than any other implementation you can make.

May I suggest you change the strategy for computing your numerical integral ?

-- 

--------------------------------------
Informatique scientifique et technique
       http://www.dxdydz.net

         Jean-Marie Thomas


        mailto:jmt at dxdydz.net

        +33 (0)3 88 32 93 64


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