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Re: problems plotting a derivative

  • To: mathgroup at
  • Subject: [mg54520] Re: [mg54479] problems plotting a derivative
  • From: "David Park" <djmp at>
  • Date: Tue, 22 Feb 2005 04:23:38 -0500 (EST)
  • Sender: owner-wri-mathgroup at

You have to Evaluate the entire parametrization.

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

Or you could use...

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

David Park
djmp at 

From: J. K. Smith [mailto:rob at]
To: mathgroup at

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)?


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