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MathGroup Archive 2000

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RE: Plots with Variable Limits?

  • To: mathgroup at
  • Subject: [mg24141] RE: [mg24100] Plots with Variable Limits?
  • From: "David Park" <djmp at>
  • Date: Wed, 28 Jun 2000 02:11:56 -0400 (EDT)
  • Sender: owner-wri-mathgroup at


Changing plot parameters and reevaluating is a common operation. I find a
convenient method is to use a compound statement where the plot parameters
are defined first. So I would do your case like this:

f[x_, a_] := a x^2

a0 = 4;
Plot[f[x, a0], {x, -2a0, 2a0}];

Then, just change the a0 value and reevaluate. This is also a way to
implement zooming.

a0 = 4;
x0 = 1;
delta = 0.5;
Plot[f[x, a0], {x, x0 - delta, x0 + delta}];

David Park
djmp at

> -----Original Message-----
> From: A. E. Siegman [mailto:siegman at]
To: mathgroup at
> I want to make a test plot of a function  f[x,a]  versus  x  for some
> trial value of the parameter  a  without fixing that parameter for
> subsequent cells, e.g. something like
>    Plot[ f[r,a], {x,-2a,2a} ]  /.  a->10
> If I try this, Mathematica gives me a  "Plot::plln"  error -- but then
> goes ahead and makes the correct plot anyway.
> I can of course turn off the error -- but what's a better, but still
> clean and simple, way to accomplish this.
> Thanks   siegman at

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