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MathGroup Archive 2004

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Re: NSolve freezes on two polynomial equations

  • To: mathgroup at smc.vnet.net
  • Subject: [mg48422] Re: NSolve freezes on two polynomial equations
  • From: carlos at colorado.edu (Carlos Felippa)
  • Date: Sat, 29 May 2004 03:06:43 -0400 (EDT)
  • References: <c96gus$icc$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Matthias.Bode at oppenheim.de wrote in message news:<c96gus$icc$1 at smc.vnet.net>...
> Gentlemen:
> 
> I made my Mathematica Solve the "innocent looking system of 2 quadratic
> equations". It worked with Mathematica 4.2, Windows XP, Dell Latitude D 600,
> 512 MB:

> The result is fine but it took some time: 1470 s.
> 

Well, I was solving thousands of those systems in a program loop.
Each NSolve typically takes 0.5 sec on my mac laptop. So if suddendly
nothing happens for one or two minutes, I consider that a freeze, as I
have to abort the code.
> 
> 
> I believe this is a bug in NSolve handling of rational functions (I need 
> to look into this further). A work around would be to remove them with 
> Numerator[Together[...]].
> 
This change did solve the "freeze".  Thanks.


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