get vector orientation from coordinates of two ends
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I a starting point of a vector at (x1,y1) and it ends at (x2, y2).
Is there anyway I can get the vector orientation theta in rad? when theta = 0 is completely arbitrary. However, maybe it is easier when the vector is pointing to right, since sin(theta) = 0 at that point.
If use the slope approach, cases where vector is pointing straight up or down cannot be solved because the slope is inf or -inf.
Any suggestions? Thanks very much!
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Accepted Answer
dpb
on 25 Aug 2018
Edited: dpb
on 25 Aug 2018
doc atan2
theta=atan2(x2-x1,y2-y1);
If you'll write x,y as vectors as
x=[x(1) x(2)]; y=[y(1) y(2)];
then you can write
theta=atan2(diff(x),diff(y));
1 Comment
Ohad Givaty
on 8 Dec 2020
you should do atan2(diff(y),diff(x));
see documentation: https://www.mathworks.com/help/matlab/ref/atan2.html
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