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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: [mg39309] Re: [mg39305] I need some help about this error
  • From: "Y.A.Tesiram" <yas at pcomm.hfi.unimelb.edu.au>
  • Date: Tue, 11 Feb 2003 04:40:47 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Have to Evaluate t.

Plot[Evaluate[t], {x, -10, 10}, AxesOrigin -> {0, 0},
  PlotRange -> {{-5, 5}, {-3, 5}}]

Yas



On Mon, 10 Feb 2003, 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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