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Re: problems plotting a derivative


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...


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