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MathGroup Archive 1997

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Re: Problems with TimeConstrained in Win3.1

  • To: mathgroup at smc.vnet.net
  • Subject: [mg6380] Re: Problems with TimeConstrained in Win3.1
  • From: Daniel Lichtblau <danl>
  • Date: Sat, 15 Mar 1997 01:21:13 -0500 (EST)
  • Organization: Wolfram Research, Inc.
  • Sender: owner-wri-mathgroup at wolfram.com

Martin Schloemer wrote:
> 
> we tried to use Timeconstrained in Mathematica 2.2 under win3.1 but it did
> not work. we need to factorize big numbers and if it takes too long we want
> mathematika to abort the process. we want to do it in a table that we can
> factorize more than 2000 random numbers.
> we have no idea what went wrong. someone else tried the same on another
> computer that does not use windows. And it worked. now we think that it
> could be a difference between the mathematica version under Windows 3.1
> and the one for Unix. Or is it just a different timeformat?
> if we use timing, it works.
> 
> please help me if you can.
> 
> THANKS!

I cannot help you with your TimeConstrained problem. Here is some
information that may be useful if you have access to version 3 of
Mathematica. Setting the FactorComplete option of FactorInteger to False
will disable the last and typically most time-consuming steps in a full
factorization. Moreover, these last parts are now substantially faster
that in previous versions. Depending on the size of your random integers
(and the speed of your machine), you may or may not want to take
advantage of this option setting.

Daniel Lichtblau
Wolfram Research
danl at wolfram.com


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