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Math problem #1

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hjwdzh opened this issue Oct 2, 2020 · 0 comments

hjwdzh commented Oct 2, 2020

I have a math problem with the equation at the last line of page 8 in the paper .

Atv = -At(A H.inv At).inv A H.inv Jt f

Typically, when I approximate H with diag(H), this will happen

Atv = -At(A Hinv At)inv A H.inv Jt f
= -At (At.inv H A.inv) A H.inv Jt f
= -Jt f

Put it into eq 9 and I will get delta X = 0, which apparently is incorrect.

Would you let me know what is wrong with my mathematics?

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