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Math Help - Simplifying matrix equation

  1. #1
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    Simplifying matrix equation

    Hey folks. I'm having trouble understanding the transition from line three to line four, in particular where the \vec{y}^T \vec{y} part gets to. When I tried it I get what's in line four, but with \vec{y}^T \vec{y} as an additional term. What am I missing here?
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  2. #2
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    Re: Simplifying matrix equation

    Can nobody help? To add more context, the result is a real number, which is why line three is identical when the trace is taken.
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  3. #3
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    Re: Simplifying matrix equation

    I think I just realised what it is. They took the derivative of that term, which becomes 0. Silly me.
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