Finding Angle between 2 points

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aaditya chandel
aaditya chandel 2020-4-20
评论： aaditya chandel 2020-4-22
Hello,
I need to calculate the angle between two point from the matlab plot. I tried by applyingthe code which is provided in the discussion but the result is not correct.
The image is attached, I want to find the angle theta which is fromed by point p1,p2 and o.
P1,P2 coordinates are known to us.
I tried using the code provided in the link attached below but the answer is not correct.
https://in.mathworks.com/matlabcentral/answers/109797-find-angle-between-dots
I need your help regarding the same.
Thanks in Advance.
Awaiting for response.
  2 个评论
MaryD
MaryD 2020-4-20
Do you know the coordinates of O point ? Or anything about that ?
aaditya chandel
aaditya chandel 2020-4-20
yes the point O coordinates are known.

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回答（2 个）

Gifari Zulkarnaen
Gifari Zulkarnaen 2020-4-20
Is this what you mean?
P1 = [10 210];
P2 = [140 210];
Z0 = [(P1(1)+P2(1))/2 225]; % Reference point, assuming it is in the middle of P1 & P2
degree = 2*atand((P2(1)-Z0(1))/(Z0(2)-P2(2)));
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aaditya chandel
aaditya chandel 2020-4-20
As shown in the figure P1,P2 and O point coordinates are know.
aaditya chandel
aaditya chandel 2020-4-20
For this case Z0 appears to be in the middle but it might not be true in other cases.
But its possible to obtain the coordiante.

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MaryD
MaryD 2020-4-20
编辑：MaryD 2020-4-20
r1=sqrt((x1-xo).^2+(y1-yo).^2);
r2=sqrt((x2-xo).^2+(y2-yo).^2);
alpha=acos((x1-xo)/r1);
beta=acos((x2-xo)/r2);
theta=alpha-beta;
keep in mind that acos is specified for pi <0:pi> so if one (or both) points would be placed under O point you have to adjust this equation.

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