polar plot 3d by data

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LUIGI BIANCO
LUIGI BIANCO 2018-10-26
回答： Star Strider 2018-10-26
I have a series of polar coordinates that describe the circumferences at different heights, how can I make a 3D plot? angle = theta(radians) radius=r height=h I am attaching 3 txt files corresponding to the coordinates of the circumferences at different heights

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回答（1 个）

Star Strider
Star Strider 2018-10-26
I am not certain what you want.
Try this:
fidi = fopen('z0.txt','rt');
D0 = textscan(fidi, '%s%s%d', 'HeaderLines',1, 'CollectOutput',1);
D0{1} = str2double(strrep(D0{1}, ',','.'));
[D0x,D0y,D0z] = pol2cart(D0{1}(:,1), D0{1}(:,2), D0{2});
fclose(fidi);
fidi = fopen('z10.txt','rt');
D10 = textscan(fidi, '%s%s%d', 'HeaderLines',1, 'CollectOutput',1);
D10{1} = str2double(strrep(D10{1}, ',','.'));
[D10x,D10y,D10z] = pol2cart(D10{1}(:,1), D10{1}(:,2), D10{2});
fclose(fidi);
fidi = fopen('z20.txt','rt');
D20 = textscan(fidi, '%s%s%d', 'HeaderLines',1, 'CollectOutput',1);
D20{1} = str2double(strrep(D20{1}, ',','.'));
[D20x,D20y,D20z] = pol2cart(D20{1}(:,1), D20{1}(:,2), D20{2});
fclose(fidi);
then:
figure
plot3(D0x,D0y,D0z) % Line Plots
hold on
plot3(D10x,D10y,D10z)
plot3(D20x,D20y,D20z)
hold off
grid on
axis equal
Dx = [D0x,D10x,D20x];
Dy = [D0y,D10y,D20y];
Dz = [D0z,D10z,D20z];
figure
surf(Dx, Dy, Dz) % Surface Plot
grid on
axis equal
The plots are approximately identical circles at various elevations, so I will not post them.

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