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Question: Strange behavior of plots[contourplot]

Question:Strange behavior of plots[contourplot]

Kitonum 20474
contourplot plotstructure
October 01 2014
2

Contour lines must be ordinary circles. In fact, we get:

plots[contourplot](1/(x^2+y^2), x=-1..1, y=-1..1);

 

 

If we use the additional options, the result is even worse:

plots[contourplot](1/(x^2+y^2), x=-1..1,y=-1..1, numpoints=10000);

 

 
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