Re: problems plotting a derivative
- To: mathgroup at smc.vnet.net
- Subject: [mg54541] Re: [mg54479] problems plotting a derivative
- From: Chris Chiasson <chris.chiasson at gmail.com>
- Date: Tue, 22 Feb 2005 04:24:45 -0500 (EST)
- References: <200502210844.DAA27207@smc.vnet.net>
- Reply-to: Chris Chiasson <chris.chiasson at gmail.com>
- Sender: owner-wri-mathgroup at wolfram.com
Try this:
f[x_] := 2x^3;
ParametricPlot[Evaluate[{D[f[x], x], x^2}], {x, 0, 1}]
The derivative command didn't work because it tried to take the
derivative of f(somenumber) with respect to a number. This is like
trying to take the derivative of x with respect to three.
On Mon, 21 Feb 2005 03:44:47 -0500 (EST), J. K. Smith <rob at pi-overe.com> 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
>
>
--
Chris Chiasson
Kettering University
Mechanical Engineering
Graduate Student
1 810 265 3161
- References:
- problems plotting a derivative
- From: "J. K. Smith" <rob@pi-overe.com>
- problems plotting a derivative