Re: Problem with Mathematica driving me nuts
- To: mathgroup at smc.vnet.net
- Subject: [mg46799] Re: Problem with Mathematica driving me nuts
- From: bobhanlon at aol.com (Bob Hanlon)
- Date: Tue, 9 Mar 2004 04:30:42 -0500 (EST)
- References: <c2he1m$ahd$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Check your options settings.
$Version
"5.0 for Mac OS X (November 19, 2003)"
FindRoot[x^2 == 4x - 4, {x, 1}]
{x -> 1.9999999701976776}
FindRoot[x^2 - 4*x + 4, {x, 3}]
{x -> 2.0000000298023224}
FindRoot[x^2 == 4x - 4, {x, 1}, WorkingPrecision->30]
{x ->
1.999999999999996447286321199499070644378662109375`30.}
Bob Hanlon
In article <c2he1m$ahd$1 at smc.vnet.net>, bpw67deletethis at hotmail.com
(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.