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 2016-10-28.