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MathGroup Archive 2003

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Re: I need some help about this error

  • To: mathgroup at smc.vnet.net
  • Subject: [mg39318] Re: I need some help about this error
  • From: Fernando Ortega <fortega at pcb.ub.es>
  • Date: Tue, 11 Feb 2003 04:41:40 -0500 (EST)
  • Organization: CESCA - Servidor de news de l'Anella Cientifica
  • References: <b27ft7$nel$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi:

you have to use the command Evaluate for evaluating your list t:

Plot[Evaluate[t], {x, -10, 10}]

I hope it works

Fernando

baruch wrote:
> f[x_] := x^2 - 2
> Ne[x_] := x - f[x]/f'[x]
> ap = NestList[Ne, 1.5, 5]
> tang[h_] := f[h] + f'[h](x - h)
> t = tang /@ ap
> 
> Plot[{t}, {x, -10, 10}, AxesOrigin -> {0, 0}, 
>   PlotRange -> {{-5, 5}, {-3, 5}}] 
> 
> Now, How can I plot the last command?
> 
> I got the following errors:
> 
> Plot::"plnr": "\!\(te[x]\) is not a machine-size real number at
> \!\(x\) = \
> \!\(-9.999999166666667`\)."
> Plot::"plnr": "\!\(te[x]\) is not a machine-size real number at
> \!\(x\) = \
> \!\(-9.188660168541684`\)."
> 
> I want to make a "program" that will plot the successives tangent
> lines of approximations of any function (when possible) using the
> Newton Methods... any idea on how can I implement or solve that
> problem?
> 
> Thank you very much!
> 



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