How to plot a 3D plot from three linear vectors?

Question

Sadiq Akbar 2022-2-21

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https://ww2.mathworks.cn/matlabcentral/answers/1655050-how-to-plot-a-3d-plot-from-three-linear-vectors

评论： Matt J 2022-2-21

I have three vectors x ,y and z. The size of all of them are same.But all of them are 1D arrays. I want to draw a 3D plot from them. Let me give it in code form as below:

x=linspace(0,180,100);% 1st vector
y=x;% 2nd vector
z=rand(1,100)*1e-7;% 3rd vector

I tried to convert both x and y to 2D vectors as below:

[x,y]=meshgrid(x,y);

But when I use the surface command or mesh command, it gives me error as:

Z must be a matrix, not a scalar or vector.

What to do?

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Answer 1

Matt J 2022-2-21

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https://ww2.mathworks.cn/matlabcentral/answers/1655050-how-to-plot-a-3d-plot-from-three-linear-vectors#answer_901195

编辑：Matt J 2022-2-21

在 MATLAB Online 中打开

x=linspace(0,180,100);% 1st vector

y=x;% 2nd vector

z=rand(1,100)*1e-7;% 3rd vector

line(x,y,z); view(3)

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Sadiq Akbar 2022-2-21

Thank you very much dear Matt J. The 2nd problem is a little bit different from above. This time both x and y vectors are of same length but I want to plot peaks on intersection of the points of x and y axes i.e., I want to draw one peak on each i.e.,

(x1,y1)=(50,50)

(x2,y2)=(70,120)

(x3,y3)=(30,65)