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Angle between a vector and a line parallel with the y-axis? (image example)

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Hi, I have this red point with coordinates (x1,y1) and I would like to calculate the angles that each vector departing from the red point to the black ones form with a line parallel to the y-axis. How should I do? I'm so sorry for the drawing but that is exactly the scenario. Thanks!

Accepted Answer

Ameer Hamza
Ameer Hamza on 3 Nov 2020
Try something like this
P = [-3, 5]; % (x1,y1)
x = [0 10]; % point of y-axis
Px = x-P;
angle = atan2(Px(1), -Px(2))
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