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MathGroup Archive 2007

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Re: How come doesn't this work?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg75714] Re: How come doesn't this work?
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Wed, 9 May 2007 04:27:37 -0400 (EDT)
  • Organization: The Open University, Milton Keynes, UK
  • References: <f1phau$i6i$1@smc.vnet.net>

Anolethron wrote:
> I know I have to put Evaluate In but it doesn't work still.
> Taylor[n_] := Normal[Series[ArcTan[x], {x, 0, n}]]
> 
> F = ArcTan[x]
> Grafico[n_] =
> Plot[{F, Taylor[n]} // Evaluate, {x, -Pi, Pi},
> DisplayFunction -> $DisplayFunction]

Define Graphico with SetDelayed (as you have done for Taylor) rather 
than Set.

Taylor[n_] := Normal[Series[ArcTan[x], {x, 0, n}]]
F = ArcTan[x];
Clear[Grafico]
Grafico[n_] := Plot[Evaluate[{F, Taylor[n]}],
    {x, -Pi, Pi}, DisplayFunction -> $DisplayFunction]
Grafico[4];

Regards,
Jean-Marc


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