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on 13 Oct 2021
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x=-10:0.1:10;
y=-10:0.1:10;
[X,Y]=meshgrid(x,y);
R=(X.^2+Y.^2)^1/2;
u=2*cos(1.3*R+1.3*5);
surf(X,Y,u);
view([-26 73])
shading interp
colormap(turbo)
zlim([-5 +5])
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