How to plot a object boundary using MATLAB if we have coordinates?

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Arun Sharma 2016-12-8

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评论： Arun Sharma 2016-12-9

Hello! Everyone, I have Object placed inside a box and i used distance sensors to get the distance of the object from a reference point (0,0,0), now i want to plot the surface of this object using MATLAB, but i am confused, which plotting function to use.

Suppose the object placed is cylindrical object as shown below.

These are the valid points which i get from the sensor from point (0,0,0) and all of these points are same across the z-axis

x = (89.26772163,89.2251516,89.17737906,89.05573047, 88.8611554,88.59463961,88.2572044,87.84990611, 90.60990337,93.38333305,96.16835842,98.96312702, 101.7657715,104.5744107,107.4709263)

y = (86.20483673,83.20379993,80.29567276,77.41496542, 74.56336272,71.74252458,68.95408524,66.19965255, 65.83194826,65.38771374,64.8663768,64.26740613, 63.59031171,62.83464514,62.04836823)

Which plot should i use to get the one side boundary using MATLAB as follow:

With the points above, it is not possible to draw the complete image, but at-least it is possible to draw the boundary of the front side. Please suggest which type of plot, surface plot i can use.

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Answer 1

KSSV 2016-12-8

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https://ww2.mathworks.cn/matlabcentral/answers/315926-how-to-plot-a-object-boundary-using-matlab-if-we-have-coordinates#answer_246409

doc cylinder

https://in.mathworks.com/help/matlab/ref/cylinder.html

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Jiro Doke 2016-12-9

在 MATLAB Online 中打开

I also get an L-shaped line. Try it.

x = [89.26772163,89.2251516,89.17737906,89.05573047, ...
     88.8611554,88.59463961,88.2572044,87.84990611, ...
     90.60990337,93.38333305,96.16835842,98.96312702, ...
     101.7657715,104.5744107,107.4709263];
y = [86.20483673,83.20379993,80.29567276,77.41496542, ...
     74.56336272,71.74252458,68.95408524,66.19965255, ...
     65.83194826,65.38771374,64.8663768,64.26740613, ...
     63.59031171,62.83464514,62.04836823];
plot(x,y)

Arun Sharma 2016-12-9

I am also getting the L-shaped line, but i thought i will get some curve. I am confused why i am getting this L-shaped line. These points are curve of the cylinder, i should get some curve like thing. I think i am doing something wrong or missing something.

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