Plot a Surface on a circle and annulus

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Delia Panca
Delia Panca 2017-1-12
回答： Roger Stafford 2017-1-13
Hello. I need to plot a surface given by the form z=f(x,y) more specifically z=x^2-y^2 on a circle centered in the origin and radius 2 and on an annulus with given radius 1<=r<=3. Can someone help me with this please?

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Roger Stafford
Roger Stafford 2017-1-13
For the circle (disk) do this:
[T,R] = meshgrid(linspace(0,2*pi,64),linspace(0,2,16));
X = R.*cos(T);
Y = R.*sin(T);
Z = X.^2-Y.^2;
surf(X,Y,Z)
For the annulus, change first line to:
[T,R] = meshgrid(linspace(0,2*pi,64),linspace(1,3,16));

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