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Subspace problem

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Umit
Umit 2012-2-17
关闭： MATLAB Answer Bot 2021-8-20
Hi, I have 2 2Dvectors that I need to compute the angle between them.
v1 = [1; 0]
v2 = [-1; 1]
subspace(v1, v2) = 1.5708 which is false
while
acos(dot(v1, v2) / (norm(v1) * norm(v2))) = 2.3562 which is true
Why subspace gives me wrong answer? Shouldn't it also gives me 2.3562? Can someone explains me why subspace works differently
Thanks

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