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I plotted the contour plot of a function 1/(2pisqrt(x^2 + y^2)).

The code is below:

contour_plot(1/2/(pi*sqrt(x^2 + y^2)), (x,-0.1,0.1), (y,-0.1,0.1),plot_points=20, colorbar=True)

The output result is not round, but square! Why?

How to fix it?

I plotted the contour plot of a function 1/(2pisqrt(x^2 1/(2*pi*sqrt(x^2 + y^2)).y^2)).

The code is below:

contour_plot(1/2/(pi*sqrt(x^2 + y^2)), (x,-0.1,0.1), (y,-0.1,0.1),plot_points=20, (x, -0.1, 0.1), (y, -0.1, 0.1),
             plot_points=20, colorbar=True)

The output result is not round, but square! Why?

How to fix it?