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Re: problems plotting a derivative

• To: mathgroup at smc.vnet.net
• Subject: [mg54555] Re: problems plotting a derivative
• From: sherifffruitfly at gmail.com
• Date: Tue, 22 Feb 2005 04:26:03 -0500 (EST)
• References: <cvc80j$qqu$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

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.

Using f'[x] in the intuitive fashion works.

That's the only 100% intuitive way I know how to do the trick...