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MathGroup Archive 2005

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Re: problems plotting a derivative

  • To: mathgroup at smc.vnet.net
  • Subject: [mg54593] Re: problems plotting a derivative
  • From: "Ray Koopman" <koopman at sfu.ca>
  • Date: Wed, 23 Feb 2005 03:13:05 -0500 (EST)
  • References: <cvc80j$qqu$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

f[x_] := 2x^3;
g[x_] := Evaluate[D[f[x], x]];
ParametricPlot[{g[x], x^2}, {x, 0, 1}]

works fine for me.

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}]
>
> When I run this I get  error messages griping about numbers not being

> valid variables but it doesn't end up plotting anything. In this
example
> I should see a straight line.
>
> I've tried using Evaluate[ D[f[x],x] ]  and lots of other schemes
which
> seemed to work in the past but I can't get ParametricPlot to digest
any
> of them.  Something about the result of that derivative doesn't yield

> something that can be plotted.  But I don't know what property it is.
>
> Would you kind Mathematica gurus please get me thru this one (too)?
> 
> Thanks.
> 
> remove the dash if emailing


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