Re: Plotting ellipses and other functions

*To*: mathgroup at smc.vnet.net*Subject*: [mg37028] Re: [mg37026] Plotting ellipses and other functions*From*: Andrzej Kozlowski <andrzej at tuins.ac.jp>*Date*: Mon, 7 Oct 2002 05:23:51 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

There are two basic ways, the second of which has two forms. The basic ways are: 1. Using the built in function ContourPlot, e.g.: ContourPlot[x^3y + y^3 - 9, {x, -9, 9}, {y, -27, 27}, Contours -> {0}, ContourShading -> False, Axes -> True, Frame -> False, PlotPoints -> 50, AxesOrigin -> {0, 0}] alternatively you can use a Standard package: <<Graphics`ImplicitPlot` ImplicitPlot[x^3y+y^3==9,{x,-9,9},AxesOrigin->{0,0}] or ImplicitPlot[x^3y+y^3-==9,{x,-9,9},{y,-27,27},AxesOrigin->{0,0}] The difference between these two is that the first one gives you a smoother picture but requires the equation to be solvable (by Mathematica) for y. The second will give a picture very similar to that produced by the first method. Andrzej Kozlowski Yokohama, Japan http://www.mimuw.edu.pl/~akoz/ http://platon.c.u-tokyo.ac.jp/andrzej/ On Sunday, October 6, 2002, at 06:33 PM, David wrote: > How can I plot functions like: > > (x-2)^2 + 2(y-3)^2 = 6 > > and > > x^3y + y^3 = 9 > > using Mathematica? > > > > > >