How to 3D plot a circle with radius of 1 in x y and sine wave in z?

Question

Hwajin Choi 2021-4-6

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https://ww2.mathworks.cn/matlabcentral/answers/794262-how-to-3d-plot-a-circle-with-radius-of-1-in-x-y-and-sine-wave-in-z

评论： Hwajin Choi 2021-4-6

Hello,

I want to 3D plot a circle looks like the image below. (Sorry for the poor drawing) The figure is a circle of radius 1 in xy surface and the circle should have a sine wave in z-direction. It's exactly same shape with pringles chip.

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Answer 1

Michael 2021-4-6

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https://ww2.mathworks.cn/matlabcentral/answers/794262-how-to-3d-plot-a-circle-with-radius-of-1-in-x-y-and-sine-wave-in-z#answer_668507

在 MATLAB Online 中打开

Try this:

%Position of center of chip in 3D space
x0 = 1;
y0 = 1;
z0 = 1;
r = 1;%Radius of chip
d_theta = 2*pi/60; %Differential Angle
th = 0:d_theta:2*pi; %Angle Vector
height = 0.5;   %Height of wave in the chip
% Create the x, y, and z positions
x = x0+r*cos(th);
y = y0+r*sin(th);
z = z0+height*sin(2*th);
plot3(x,y,z)
grid on
axis equal

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Hwajin Choi 2021-4-6

Exactly what I wanted. Thank you. I appreciate the all commented codes.

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Answer 2

William 2021-4-6

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https://ww2.mathworks.cn/matlabcentral/answers/794262-how-to-3d-plot-a-circle-with-radius-of-1-in-x-y-and-sine-wave-in-z#answer_668512

在 MATLAB Online 中打开

How about this:

theta = linspace(0,2*pi,100);
x = sin(theta);
y = cos(theta);
z = sin(2*theta);
figure();
plot3(x,y,z);

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Hwajin Choi 2021-4-6

Thank you for your help, William. It's nice simple and neat code. Although I cannot accept your answer because I already accepted another one, I would like to vote yours. Thank you!

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