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Re: Other bug in ContourPlot

• To: mathgroup at smc.vnet.net
• Subject: [mg81733] Re: Other bug in ContourPlot
• From: Bill Rowe <readnewsciv at sbcglobal.net>
• Date: Tue, 2 Oct 2007 05:43:54 -0400 (EDT)

On 10/1/07 at 4:37 AM, misvrne at gmail.com (Miguel) wrote:

>If you run the ContourPlot a first time, it works fine. But, if you
>run ContourPlot again, the graphics previous or nothing is
>displayed.

>http://mathematicaes.googlegroups.com/web/ContourPlotBis.pdf

>The last version 6.0.1 is like a Gruyere chees: it is completed with
>innumerable holes.

Perhaps. But the example in the PDF file doesn't demonstrate a
bug with ContourPlot. The reason you get no curve in the second
plot is there are no solutions to

x^2/9 + y^2/16 == 25 in the region defined by -6 <= x <= 6 and
-6 <= y <= 6

Try doing:

sol = x^2/9 + y^2/16 - 25;
ContourPlot[sol == 0, {x, -20, 20}, {y, -20, 20}]

and you will see the curve lies outside the plot region you specified
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