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November 25th, 2015, 03:39 AM   #1
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Gradient of squared norm

I have to find gradient of norm(x'Ax'-b) where x is a vector and A is a 4x4 symmetric matrix. I am trying to solve it by using identities given in https://en.wikipedia.org/wiki/Matrix_calculus but I am not able to figure out which identity suits my problem. I would appreciate if anyone tells me how to tackle this problem.
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