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Differentiation with matrices/vectors 
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#1
Mar513, 08:57 AM

P: 1,212

Hello,
I'm trying to understand this proof: http://en.wikipedia.org/wiki/Proofs_...tor_for_.CE.B2 Can someone quickly talk me through the differentiation step, bearing in mind I've never learn how to differentiate with respect to a vector? Most confusing for me is: 1. why are they differentiating with respect to the transpose b' rather than just b? 2. where does the 2X'y term come from? 3. is there any assumption here that X is square? Thanks for any help, Mike 


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