How to find the angle made by eigen vector and x-axis?

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Suhas Yelluru 2014-5-5

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https://ww2.mathworks.cn/matlabcentral/answers/128311-how-to-find-the-angle-made-by-eigen-vector-and-x-axis

评论： John D'Errico 2014-5-5

I have used the function "eig()" to obtain eigen values and eigen vectors of a grayscale image, i now need to find the angle made by the eigen vector with respect to x-axis. Please help!

Thanks in advance!

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Geoff Hayes 2014-5-5

Can't the usual method of finding the angle be used? If the vector is [x1 y1], then the angle with respect to the x-axis is atan2(y1,x1)? (Naturally this assumes an origin of (0,0) which may be different than that which is in your problem.)

John D'Errico 2014-5-5

We don't know how you used eig in this case. For example, did you simply apply eig to a square image as an array? Show what you did, as your question is impossible to answer otherwise.

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