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MathGroup Archive 2005

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Re: problems plotting a derivative

  • To: mathgroup at
  • Subject: [mg54604] Re: problems plotting a derivative
  • From: dh <dh at>
  • Date: Thu, 24 Feb 2005 03:21:08 -0500 (EST)
  • References: <cvc80j$qqu$>
  • Sender: owner-wri-mathgroup at

Hello J.K.,
see below

J. K. Smith wrote:
> I've tried a lot of ways but nothing has worked so far.
> The following statements are my problem simplified:
> f[x_] := 2x^3;
> ParametricPlot[{D[f[x], x], x^2}, {x, 0, 1}]

ParametricPlot has the Attribute "HoldAll". Therefore, either you do the 
outside the ParametricPlot or you need Evaluate inside ParametricPlot like:
ParametricPlot[Evaluate[{D[f[x], x], x^2}], {x, 0, 1}]

This works at least on Mathematica 5.1

Sincerely, Daniel


Daniel Huber
Metrohm Ltd.
Oberdorfstr. 68
CH-9100 Herisau
Tel. +41 71 353 8585, Fax +41 71 353 8907
E-Mail:<mailto:dh at>

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