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. >