Plot a unit vector in MATLAB, given its starting point and the orientation about 3 axes

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crisdeodates 2019-11-22

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https://ww2.mathworks.cn/matlabcentral/answers/492616-plot-a-unit-vector-in-matlab-given-its-starting-point-and-the-orientation-about-3-axes

编辑： crisdeodates 2019-11-22

I have a point [x y z] and the Euler orientation angles [r p y]. How can I plot a unit vector in MATLAB starting from [x y z] in the orientation of [r p y] ?

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crisdeodates 2019-11-22

Thanks Adam, but my requirement is to use Euler angles to plot a unit vector starting at the specified point. And my goal is to get the plot in 3D.

Adam Danz 2019-11-22

编辑：Adam Danz 2019-11-22

Ah, right. Then sph2cart() would be more useful

[x,y,z] = sph2cart(azimuth,elevation,r)

or rotm = eul2rotm(eul) and eul = rotm2eul(rotm)

This link looks promising, too

https://www.mathworks.com/discovery/euler-angles.html

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crisdeodates 2019-11-22

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https://ww2.mathworks.cn/matlabcentral/answers/492616-plot-a-unit-vector-in-matlab-given-its-starting-point-and-the-orientation-about-3-axes#answer_402866

编辑：crisdeodates 2019-11-22

At last found a very simple solution.

Converted the euler angles to rotation matrix and rotated to unit vector.

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Adam Danz 2019-11-22

Congrats! If you provide a simple demo or example in your answer it will be more useful to people who may come across this post in the future.

crisdeodates 2019-11-22

编辑：crisdeodates 2019-11-22

Sure ...

Lets say we want to visualize a vector at a given point [0 0 10] and orientation [0 0 50].

Convert the orientation angles to radians using deg2rad function.
Find the rotational matrix using eul2rotm function in the sequence (eg: XYZ) required.
Initialize a unit vector along x-axis as [1 0 0].
Rotate the unit vector using the rotational matrix obtained in step 2.
Plot the newly formed directional vector usingquiver3 function.