Plotting Implicit Function in Polar Coordinate

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Teerapong Poltue
Teerapong Poltue 2021-1-18
回答： Divija Aleti 2021-2-5
I can plot this equation - cos(x) + cos(y) + cos(z) = 0
with cartician coordinate using this code.
syms x y z
f = @(x,y,z) cos(x) + cos(y) + cos(z);
a = 0:0.1:2*pi;
b = 0:0.1:2*pi;
c = 0:0.1:2*pi;
[X,Y,Z] = meshgrid(a,b,c);
data = f(X,Y,Z);
p = patch(isosurface(a,b,c,data,0));
isonormals(X,Y,Z,data,p)
cdata = smooth3(rand(size(data)),'box',7);
isocolors(X,Y,Z,cdata,p)
p.FaceColor = 'interp';
p.EdgeColor = 'none';
view(150,30)
daspect([1 1 1])
axis tight
camlight
lighting gouraud
But now I would like to plot in r, theta, z coordinate like a coin shape fill with this surface how can I do that ?

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回答（1 个）

Divija Aleti
Divija Aleti 2021-2-5
Hi Teerapong,
Have a look at the following links:
https://www.mathworks.com/help/matlab/ref/cart2pol.html
https://www.mathworks.com/help/matlab/ref/polarplot.html
Additionally, you can download 3D Polar plot from file exchange, which may help:
https://www.mathworks.com/matlabcentral/fileexchange/13200-3d-polar-plot
Regards,
Divija

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