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The χ2 gradient

The χ2 gradient in vector notation is

∇χ2(θ) = 2$\displaystyle \sum_{{i=1}}^{n}$$\displaystyle {\frac{{(\mathrm{R}_i- \mathrm{R}_i(\theta))^2}}{{\sigma_i^2}}}$∇Ri(θ). (15.14)


The relax user manual (PDF), created 2020-08-26.