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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: [mg46818] Re: [mg46791] Problem with Mathematica driving me nuts
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Tue, 9 Mar 2004 04:31:06 -0500 (EST)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • References: <200403080910.EAA10442@smc.vnet.net>
  • Reply-to: murray at math.umass.edu
  • Sender: owner-wri-mathgroup at wolfram.com

What version of Mathematica are you using (and on what hardware platform)?

With Mathematica 5.0.0 under Windows XP on an Intel Pentium III, for 
both inputs I get the same result:  2.

benwoodward.com wrote:
> 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.
> 
> 

-- 
Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                413 545-2859 (W)
710 North Pleasant Street            fax   413 545-1801
Amherst, MA 01003-9305


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