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! >