plotting concentric circles using contour

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Randy Chen
Randy Chen 2020-10-26
评论： Star Strider 2020-10-27
I'm trying to plot a few concentric circles with the following codes, but what I get is an ellipse, i don't know why:
[x,y] = meshgrid(-3:0.1:3,-3:0.1:3);
z = x.^2+y.^2;
contour(x,y,z)

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Star Strider
Star Strider 2020-10-26
Use the axis function, specifically either:
axis('equal') % Function Expression
or:
axis equal % Command Expression
.
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