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Re: problems plotting a derivative


Hi,

ParametricPlot[Evaluate[{D[f[x], x], x^2}], {x, 0, 1}]

Regards
  Jens

"J. K. Smith" <rob at pi-overe.com> schrieb im Newsbeitrag 
news:cvc80j$qqu$1 at smc.vnet.net...
> 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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