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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: [mg46794] RE: [mg46791] Problem with Mathematica driving me nuts
  • From: "Owen, HL (Hywel)" <H.L.Owen at dl.ac.uk>
  • Date: Tue, 9 Mar 2004 04:30:38 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

I get 2. up to 100 decimals, using V5.0 on WinXP, for both expressions.
Something up with your default numerical accuracy? Which version are you
using?

Hywel

> -----Original Message-----
> From: bpw67deletethis at hotmail.com [mailto:bpw67deletethis at hotmail.com]
To: mathgroup at smc.vnet.net
> Sent: 08 March 2004 09:10
> To: mathgroup at smc.vnet.net
> Subject: [mg46794] [mg46791] Problem with Mathematica driving me nuts
> 
> 
> 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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