How to use the three points A1, A2, and B0 to calculate ∠A1B0A2?

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Wesley
Wesley il 15 Dic 2020
Commentato: James Tursa il 17 Dic 2020

Accedi per rispondere a questa domanda.

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KSSV
KSSV il 15 Dic 2020
A1 = [171 422] ;
A2 = [415 413] ;
B0 = [277 386] ;
d1 = A1-B0 ;
d2 = A2-B0 ;
theta = atan((d2(2)-d1(2))/(d2(1)-d1(1)))
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Wesley
Wesley il 17 Dic 2020
I'm very sorry. It was my mistake, your procedure is correct.
James Tursa
James Tursa il 17 Dic 2020
@KSSV: Your solution produces the angle that the A2-A1 vector makes with the x-axis. It does not involve B0 at all. This does not seem to answer the question.

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James Tursa
James Tursa il 17 Dic 2020
Modificato: James Tursa il 17 Dic 2020
A1 = [171 422] ;
A2 = [415 413] ;
B0 = [277 386] ;
d1 = A1-B0 ;
d2 = A2-B0 ;
theta = atan2( norm(cross([d1 0],[d2 0])), dot(d1,d2) );
See this link:
https://www.mathworks.com/matlabcentral/answers/101590-how-can-i-determine-the-angle-between-two-vectors-in-matlab?s_tid=ta_ans_results

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