Re: ContourPlots

*To*: mathgroup at christensen.cybernetics.net*Subject*: [mg2042] Re: [mg2024] ContourPlots*From*: Tom Wickham-Jones <twj>*Date*: Sat, 16 Sep 1995 01:42:24 -0400

>I would like to know how to plot two ContourPlots (with Contours at >0) into one plot. The command Show[plot1,plot2], where plot1 and >plot2 >are defined as ContourPlots does not work, Also, the command >PLot[{f1,f2},{x,.,.},{y,.,.}], where f1 and f2 define two implicit >functions in x and y does not work either. Is there a way that works >well? If you want to plot an implicit function then the command to use is ContourPlot. If you want to combine two contours you can do this with Show[plot1,plot2]. When you do it you probably want to turn off contour shading so that one plot does not hide the other. In[8]:= ContourPlot[ x^2 +y^2-1, {x, -2,2},{y,-2,2}, ContourShading -> False, Contours -> {0}] Out[8]= -ContourGraphics- In[9]:= ContourPlot[ x^2 y^2-1, {x, -2,2},{y,-2,2}, ContourShading -> False, Contours -> {0}] Out[9]= -ContourGraphics- In[10]:= Show[%, %%] Out[10]= -Graphics- Tom Wickham-Jones WRI