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Re: Problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg43024] Re: [mg42967] Problem
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Fri, 8 Aug 2003 00:26:38 -0400 (EDT)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • References: <200308070453.AAA23993@smc.vnet.net>
  • Reply-to: murray at math.umass.edu
  • Sender: owner-wri-mathgroup at wolfram.com

You'll want to use the Standard AddOn package Graphics`ImplicitPlot`. 
After loading the package...

   << Graphics`ImplicitPlot`

use ImplicitPlot perhaps like this

   ImplicitPlot[x - x^2 + y - y^2 == -3, {x, -5, 5}, {y, -5, 5}];

or like this:

   ImplicitPlot[x - x^2 + y - y^2 == -3, {x, -5, 5}];

Both plot the same curve (but with different ranges on the axes). 
Mathematica uses one of two different methods to generate the curves  -- 
in the first instance, by using Solve; in the second instance, by 
forming a contour.  See the HelpBrowser documentation.

Andrew Thomas wrote:

> Dear All, 
> 
> This is a simple one but I cannot find out how to plot the following.
> 
> c=(x-x^2)+(y-y^2) where c is a constant.
> 
> The problem is that everytime I go to plot the plot is always defined
> as y=f(x,...) and so I cannot enter y^2 into the equation.
> 
> Could someone please advise.
> 
> Thank you and best wishes,
> 
> Andrew
> 
> 
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-- 
Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                413 545-2859 (W)
710 North Pleasant Street            fax   413 545-1801
Amherst, MA 01003-9305


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      • From: "Andrew Thomas" <Andrew.Thomas@oft.gsi.gov.uk>
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