plotting concentric circles using contour

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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)

Star Strider 2020-10-26

Use the axis function, specifically either:

axis('equal') % Function Expression

or:

axis equal % Command Expression

Randy Chen 2020-10-27

thanks a lot!

Star Strider 2020-10-27

As always, my pleasure!

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