query: How to calculate the angle of a vector $x\hat i + y\hat j$ if $x = 0$
positive_passages.docid: 147334
positive_passages.text: We have angle=arctan(dy/dx), but what happens when dx=0?
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negative_passages.text: Does $\hat{\beta}=(X′X)^{−1}X′ \ Y$ simplify further?
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negative_passages.text: Calculate the components of a unit vector that lies in the xy-plane and makes equal angles with the positive directions of the x- and y-axes
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negative_passages.text: How do you get $\rm{var}(\Theta -\hat\theta) = \rm{var}(\Theta)$?
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negative_passages.text: Average angle between two randomly chosen vectors in a unit square
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negative_passages.text: Analytic solution for angle of minimum deviation?
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negative_passages.text: What does  (angle brackets) mean in Java?
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