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MathGroup Archive 2004

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Re: Problem with Mathematica driving me nuts

  • To: mathgroup at smc.vnet.net
  • Subject: [mg46793] Re: Problem with Mathematica driving me nuts
  • From: "Graham Michalk" <gmichalk at optushome.com.au>
  • Date: Tue, 9 Mar 2004 04:30:38 -0500 (EST)
  • References: <c2he1m$ahd$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Ben,

Mathematica 4.2 delivers your results.

Mathematica 5.0.0 delivers, in both cases:

{x -> 2.}

Graham M

"benwoodward.com" <bpw67deletethis at hotmail.com> wrote in message
news:c2he1m$ahd$1 at smc.vnet.net...
> FindRoot[x^2 == 4x - 4, {x, 1}]
>
> Out[4]=
> {x -> 1.99902}
>
> In[15]:=
> FindRoot[x^2 - 4*x + 4, {x, 3}]
>
> Out[15]=
> {x -> 2.00098}
>
> When the root is clearly two.
> Is Mathematica using Newton's Method like a Ti-92?
> Even if so, why wont it give a more accurate answer?
> I've tried N[%,30] but it doesn't do anything.
> I'm new to Mathematica coming over from a Ti-92, so everything is
> frustrating right now.
> Thanks.
>



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